NATGW UMN 0930 version

Reviewed-by: Kucerak, Kristian <kristian.kucerak@t-systems.com>
Co-authored-by: Qin Ying, Fan <fanqinying@huawei.com>
Co-committed-by: Qin Ying, Fan <fanqinying@huawei.com>

docs/natgw/umn/PARAMETERS.txt

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docs/natgw/umn/en-us_topic_0086739750.html

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+<h1 class="topictitle1">Notes and Constraints</h1>
+<div id="body44798466"><div class="p" id="en-us_topic_0086739750__p51636249">When using a NAT gateway:<ul id="en-us_topic_0086739750__ul19936322151214"><li id="en-us_topic_0086739750__li21523698151214">Multiple rules for one NAT gateway can use the same EIP, but the rules for different NAT gateways must use different EIPs.</li><li id="en-us_topic_0086739750__li59495558151214">Each VPC can only have one NAT gateway.</li><li id="en-us_topic_0086739750__li65697982151214">Manually adding the default route for a VPC is not allowed.</li><li id="en-us_topic_0086739750__li54410930151214">Each VPC subnet can only be used in one SNAT rule.</li><li id="en-us_topic_0086739750__li26824967151221">SNAT and DNAT rules cannot share the same EIP.</li><li id="en-us_topic_0086739750__li3734117115216">DNAT rules do not support the mapping between an EIP and a virtual IP address.</li><li id="en-us_topic_0086739750__li13934170151245">If both an EIP and a NAT gateway are configured for a server, data will be forwarded through the EIP.</li><li id="en-us_topic_0086739750__li72493121160">When you add an SNAT rule, if the rule is used in the VPC scenario, the custom CIDR block must be a subset of the NAT gateway's VPC subnets. If the rule is used in the Direct Connect scenario, the custom CIDR block must be a CIDR block of a Direct Connect connection and cannot overlap with the NAT gateway's VPC subnets.</li><li id="en-us_topic_0086739750__li0411182717138">You can configure only one DNAT rule for each port of a server. One port can be mapped to only one EIP.</li></ul>
+</div>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_pro_0000.html">Overview</a></div>
+</div>
+</div>
+

docs/natgw/umn/en-us_topic_0086739762.html

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+<a name="en-us_topic_0086739762"></a><a name="en-us_topic_0086739762"></a>
+
+<h1 class="topictitle1">What Is NAT Gateway?</h1>
+<div id="body48115835"><p id="en-us_topic_0086739762__p65776999">The NAT Gateway service provides network address translation (NAT) with 20 Gbit/s of bandwidth for Elastic Cloud Servers (ECSs) and Bare Metal Servers (BMSs) in a Virtual Private Cloud (VPC), or servers that connect to a VPC through Direct Connect or Virtual Private Network (VPN) in on-premises data centers, allowing these servers to share elastic IP addresses (EIPs) to access the Internet or to provide services accessible from the Internet.</p>
+<p id="en-us_topic_0086739762__p644338185415">NAT Gateway supports source NAT (SNAT) and destination NAT (DNAT).</p>
+<ul id="en-us_topic_0086739762__ul1229332415511"><li id="en-us_topic_0086739762__li1298193215017">SNAT translates private IP addresses into EIPs, allowing servers in a VPC to share an EIP to access the Internet in a secure and efficient way.<div class="p" id="en-us_topic_0086739762__p458793316019"><a name="en-us_topic_0086739762__li1298193215017"></a><a name="li1298193215017"></a><a href="#en-us_topic_0086739762__fig439218341217">Figure 1</a> shows the SNAT architecture.<div class="fignone" id="en-us_topic_0086739762__fig439218341217"><a name="en-us_topic_0086739762__fig439218341217"></a><a name="fig439218341217"></a><span class="figcap"><b>Figure 1 </b>SNAT architecture</span><br><span><img class="vsd" id="en-us_topic_0086739762__image759251514578" src="en-us_image_0201532914.png"></span></div>
+</div>
+<p id="en-us_topic_0086739762__p925812315216"></p>
+</li><li id="en-us_topic_0086739762__li1761018322558">DNAT enables servers in a VPC to share an EIP to provide services accessible from the Internet through IP address mapping or port mapping.<p id="en-us_topic_0086739762__p206751417117"><a name="en-us_topic_0086739762__li1761018322558"></a><a name="li1761018322558"></a><a href="#en-us_topic_0086739762__fig13245644101814">Figure 2</a> shows the DNAT architecture.</p>
+<div class="fignone" id="en-us_topic_0086739762__fig13245644101814"><a name="en-us_topic_0086739762__fig13245644101814"></a><a name="fig13245644101814"></a><span class="figcap"><b>Figure 2 </b>DNAT architecture</span><br><span><img class="vsd" id="en-us_topic_0086739762__image634317311714" src="en-us_image_0201532822.png"></span></div>
+</li></ul>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_pro_0000.html">Overview</a></div>
+</div>
+</div>
+

docs/natgw/umn/en-us_topic_0086739763.html

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+<a name="en-us_topic_0086739763"></a><a name="en-us_topic_0086739763"></a>
+
+<h1 class="topictitle1">NAT Gateway Types</h1>
+<div id="body53775824"><p id="en-us_topic_0086739763__p1863217173361">A NAT gateway type specifies the maximum number of SNAT connections supported by a NAT gateway.</p>
+<p id="en-us_topic_0086739763__p8060118">An SNAT connection consists of the source IP address, source port, destination IP address, destination port, and transmission-layer protocol. The source IP address refers to the EIP, and the source port refers to the EIP port. They will be used to access the destination IP address and port of the Internet. These five elements identify a connection as a unique session.</p>
+<p id="en-us_topic_0086739763__p3355543392418">The data throughput of a NAT gateway is determined by the sum of the EIP bandwidths used by its DNAT rules. For example, if a NAT gateway has two DNAT rules, and their EIP bandwidths are 10 Mbit/s and 5 Mbit/s, respectively, the throughput of the NAT gateway is 15 Mbit/s.</p>
+<div class="p" id="en-us_topic_0086739763__p289201164020">When creating a NAT gateway, select the type based on your service requirements. <a href="#en-us_topic_0086739763__table39923257151849">Table 1</a> lists the NAT gateway types.
+<div class="tablenoborder"><a name="en-us_topic_0086739763__table39923257151849"></a><a name="table39923257151849"></a><table cellpadding="4" cellspacing="0" summary="" id="en-us_topic_0086739763__table39923257151849" frame="border" border="1" rules="all"><caption><b>Table 1 </b>NAT gateway types</caption><thead align="left"><tr id="en-us_topic_0086739763__row26507130151849"><th align="left" class="cellrowborder" valign="top" width="48.96065968046727%" id="mcps1.3.4.2.2.3.1.1"><p id="en-us_topic_0086739763__p10919583151849"><strong id="en-us_topic_0086739763__b49779767">Type</strong></p>
+</th>
+<th align="left" class="cellrowborder" valign="top" width="51.03934031953272%" id="mcps1.3.4.2.2.3.1.2"><p id="en-us_topic_0086739763__p38230083151849"><strong id="en-us_topic_0086739763__b842352706135953">Maximum Number of SNAT Connections</strong></p>
+</th>
+</tr>
+</thead>
+<tbody><tr id="en-us_topic_0086739763__row32100542151849"><td class="cellrowborder" valign="top" width="48.96065968046727%" headers="mcps1.3.4.2.2.3.1.1 "><p id="en-us_topic_0086739763__p66702817151849">Small</p>
+</td>
+<td class="cellrowborder" valign="top" width="51.03934031953272%" headers="mcps1.3.4.2.2.3.1.2 "><p id="en-us_topic_0086739763__p34219059151849">10,000</p>
+</td>
+</tr>
+<tr id="en-us_topic_0086739763__row12752392151849"><td class="cellrowborder" valign="top" width="48.96065968046727%" headers="mcps1.3.4.2.2.3.1.1 "><p id="en-us_topic_0086739763__p20469426151849">Medium</p>
+</td>
+<td class="cellrowborder" valign="top" width="51.03934031953272%" headers="mcps1.3.4.2.2.3.1.2 "><p id="en-us_topic_0086739763__p47410811151849">50,000</p>
+</td>
+</tr>
+<tr id="en-us_topic_0086739763__row56885558151849"><td class="cellrowborder" valign="top" width="48.96065968046727%" headers="mcps1.3.4.2.2.3.1.1 "><p id="en-us_topic_0086739763__p47662666151849">Large</p>
+</td>
+<td class="cellrowborder" valign="top" width="51.03934031953272%" headers="mcps1.3.4.2.2.3.1.2 "><p id="en-us_topic_0086739763__p35470708151849">200,000</p>
+</td>
+</tr>
+<tr id="en-us_topic_0086739763__row44794007151849"><td class="cellrowborder" valign="top" width="48.96065968046727%" headers="mcps1.3.4.2.2.3.1.1 "><p id="en-us_topic_0086739763__p42207974151849">Extra-large</p>
+</td>
+<td class="cellrowborder" valign="top" width="51.03934031953272%" headers="mcps1.3.4.2.2.3.1.2 "><p id="en-us_topic_0086739763__p63402763151849">1,000,000</p>
+</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+<div class="note" id="en-us_topic_0086739763__note7817161164315"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="en-us_topic_0086739763__ul582319291915"><li id="en-us_topic_0086739763__li3823142121917">If the requests exceed the maximum connections allowed by your NAT gateway, your services will be adversely affected. To avoid this situation, create alarm rules for the SNAT connection in Cloud Eye.</li><li id="en-us_topic_0086739763__li119011149194">A maximum of 200 DNAT rules can be added for each NAT gateway. The number of DNAT rules that you can add for a NAT gateway has no relationship with the NAT gateway type. The number of SNAT rules that you can add for a NAT gateway has no relationship with the NAT gateway type.</li></ul>
+</div></div>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_pro_0000.html">Overview</a></div>
+</div>
+</div>
+

docs/natgw/umn/en-us_topic_0087895790.html

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+<a name="en-us_topic_0087895790"></a><a name="en-us_topic_0087895790"></a>
+
+<h1 class="topictitle1"><strong id="b267001633517">Overview</strong></h1>
+<div id="body1534986796066"><p id="en-us_topic_0087895790__p10902119154811">If servers (ECSs and BMSs) without EIPs bound need to access the Internet, the servers can share one or more EIPs to access the Internet through a NAT gateway. This method provides access without exposing their IP addresses. <a href="#en-us_topic_0087895790__fig3421331131416">Figure 1</a> illustrates the process.</p>
+<div class="fignone" id="en-us_topic_0087895790__fig3421331131416"><a name="en-us_topic_0087895790__fig3421331131416"></a><a name="fig3421331131416"></a><span class="figcap"><b>Figure 1 </b>Flowchart</span><br><span><img class="vsd" id="en-us_topic_0087895790__image442123112143" src="en-us_image_0201532815.png"></span></div>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_qs_0001.html">Using SNAT to Access the Internet</a></div>
+</div>
+</div>
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docs/natgw/umn/en-us_topic_0113772081.html

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+<a name="en-us_topic_0113772081"></a><a name="en-us_topic_0113772081"></a>
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+<h1 class="topictitle1">Creating Alarm Rules</h1>
+<div id="body1527071529095"><div class="section" id="en-us_topic_0113772081__section38299792222911"><h4 class="sectiontitle">Scenarios</h4><p id="en-us_topic_0113772081__p40311482223529">You can set NAT gateway alarm rules to customize the monitored objects and notification policies. Then, you can learn NAT gateway running status in a timely manner. </p>
+</div>
+<div class="section" id="en-us_topic_0113772081__section7969360222918"><h4 class="sectiontitle">Procedure</h4><ol id="en-us_topic_0113772081__ol4340316622382"><li id="en-us_topic_0113772081__li93918114239">Log in to the management console.</li><li id="en-us_topic_0113772081__li840318282158">Click <span><img id="en-us_topic_0113772081__en-us_topic_0118498823_image338921514480" src="en-us_image_0141273034.png"></span> in the upper left corner and select the desired region and project.</li><li id="en-us_topic_0113772081__li2599558622382">Under <strong id="en-us_topic_0113772081__b58911511711">Management &amp; Deployment</strong>, select <strong id="en-us_topic_0113772081__b898215251712">Cloud Eye</strong>.</li><li id="en-us_topic_0113772081__li13187821225633">In the left navigation pane, choose <strong id="en-us_topic_0113772081__b9948171393614">Alarm Management</strong> &gt; <strong id="en-us_topic_0113772081__b894811132362">Alarm Rules</strong>.</li><li id="en-us_topic_0113772081__li32623014182110">On the <strong id="en-us_topic_0113772081__b842352706163218">Alarm Rules</strong> page, click <strong id="en-us_topic_0113772081__b842352706163235">Create Alarm Rule</strong> and specify required parameters.</li><li id="en-us_topic_0113772081__li3591727112520">Click <strong id="en-us_topic_0113772081__b842352706104736">Next</strong> and specify rule parameters as prompted.</li><li id="en-us_topic_0113772081__li1189243473116">Click <strong id="en-us_topic_0113772081__b11691135671712">Finish</strong>. After the alarm rule is set, the system automatically notifies you when an alarm is triggered.</li></ol>
+<div class="note" id="en-us_topic_0113772081__note1389233473114"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="en-us_topic_0113772081__p11892163463116">For more information about how to set alarm rules, see <em id="en-us_topic_0113772081__i842352697151939">Cloud Eye User Guide</em>.</p>
+</div></div>
+</div>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_ces_0001.html">Monitoring Management</a></div>
+</div>
+</div>
+

docs/natgw/umn/en-us_topic_0127489529.html

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+<a name="en-us_topic_0127489529"></a><a name="en-us_topic_0127489529"></a>
+
+<h1 class="topictitle1">Adding an SNAT Rule</h1>
+<div id="body8662426"><div class="section" id="en-us_topic_0127489529__en-us_topic_0127293981_section18103401105119"><h4 class="sectiontitle">Scenarios</h4><p id="en-us_topic_0127489529__en-us_topic_0127293981_p45075714105130">After a NAT gateway is created, add SNAT rules. With the SNAT rule, servers in a VPC subnet or servers that are connected to a VPC through Direct Connect or VPN can access the Internet by sharing an <span id="en-us_topic_0127489529__text19978444133619">EIP</span><span id="en-us_topic_0127489529__text169781344143611"></span>.</p>
+<p id="en-us_topic_0127489529__en-us_topic_0127293981_p16973952192016">Each SNAT rule is configured for one subnet. If there are multiple subnets in a VPC, you can create several SNAT rules to share EIPs.</p>
+</div>
+<div class="section" id="en-us_topic_0127489529__en-us_topic_0127293981_section27241609"><h4 class="sectiontitle"><strong id="en-us_topic_0127489529__b14876208462">Prerequisites</strong></h4><ul id="en-us_topic_0127489529__ul1732114535152"><li id="en-us_topic_0127489529__li1132135317151">A NAT gateway has been created.</li></ul>
+</div>
+<div class="section" id="en-us_topic_0127489529__en-us_topic_0127293981_section43847892"><h4 class="sectiontitle">Procedure</h4><ol id="en-us_topic_0127489529__en-us_topic_0127293981_ol5426870018482"><li id="en-us_topic_0127489529__en-us_topic_0127293981_li25980584101236">Log in to the management console.</li><li id="en-us_topic_0127489529__en-us_topic_0127293981_li840318282158">Click <span><img id="en-us_topic_0127489529__en-us_topic_0127293981_en-us_topic_0118498823_image338921514480" src="en-us_image_0201532864.png"></span> in the upper left corner and select the desired region and project.</li><li id="en-us_topic_0127489529__en-us_topic_0127293981_li1049617094325">Under <strong id="en-us_topic_0127489529__b384155103713">Network</strong>, choose <strong id="en-us_topic_0127489529__b1845512371">NAT Gateway</strong>.</li><li id="en-us_topic_0127489529__en-us_topic_0127293981_li8610102724918">On the displayed page, click the name of the NAT gateway for which you want to add the SNAT rule.</li><li id="en-us_topic_0127489529__en-us_topic_0127293981_li7563844165416">On the <strong id="en-us_topic_0127489529__b109893106452">SNAT Rules</strong> tab, click <strong id="en-us_topic_0127489529__b799021024511">Add SNAT Rule</strong>.<p id="en-us_topic_0127489529__p163554331436"></p>
+<div class="fignone" id="en-us_topic_0127489529__fig7424951145214"><span class="figcap"><b>Figure 1 </b>Add SNAT Rule</span><br><span><img id="en-us_topic_0127489529__nat_qs_0004_image10874193014462" src="en-us_image_0201532851.png"></span></div>
+</li><li id="en-us_topic_0127489529__en-us_topic_0127293981_li704280616453">Configure the parameters as prompted. For details, see <a href="#en-us_topic_0127489529__en-us_topic_0127293981_table4272024117597">Table 1</a>.
+<div class="tablenoborder"><a name="en-us_topic_0127489529__en-us_topic_0127293981_table4272024117597"></a><a name="en-us_topic_0127293981_table4272024117597"></a><table cellpadding="4" cellspacing="0" summary="" id="en-us_topic_0127489529__en-us_topic_0127293981_table4272024117597" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Parameter descriptions</caption><thead align="left"><tr id="en-us_topic_0127489529__en-us_topic_0127293981_row3248015417597"><th align="left" class="cellrowborder" valign="top" width="18.01%" id="mcps1.3.3.2.6.2.2.4.1.1"><p id="en-us_topic_0127489529__en-us_topic_0127293981_p1364683317597"><strong id="en-us_topic_0127489529__b537195719457">Parameter</strong></p>
+</th>
+<th align="left" class="cellrowborder" valign="top" width="30.91%" id="mcps1.3.3.2.6.2.2.4.1.2"><p id="en-us_topic_0127489529__p18531490225"><strong id="en-us_topic_0127489529__b142434125376">Condition</strong></p>
+</th>
+<th align="left" class="cellrowborder" valign="top" width="51.080000000000005%" id="mcps1.3.3.2.6.2.2.4.1.3"><p id="en-us_topic_0127489529__en-us_topic_0127293981_p1643000117597"><strong id="en-us_topic_0127489529__b1239112593454">Description</strong></p>
+</th>
+</tr>
+</thead>
+<tbody><tr id="en-us_topic_0127489529__en-us_topic_0127293981_row144002379410"><td class="cellrowborder" valign="top" width="18.01%" headers="mcps1.3.3.2.6.2.2.4.1.1 "><p id="en-us_topic_0127489529__en-us_topic_0127293981_p2400173718417">Scenario</p>
+</td>
+<td class="cellrowborder" valign="top" width="30.91%" headers="mcps1.3.3.2.6.2.2.4.1.2 "><p id="en-us_topic_0127489529__p11378191114341">N/A</p>
+</td>
+<td class="cellrowborder" valign="top" width="51.080000000000005%" headers="mcps1.3.3.2.6.2.2.4.1.3 "><p id="en-us_topic_0127489529__en-us_topic_0127293981_p4400123718411">The scenarios where the SNAT rule is used.</p>
+<p id="en-us_topic_0127489529__p51852719278">Select <strong id="en-us_topic_0127489529__b9440125510523">VPC</strong> if your servers in a VPC need to access the Internet.</p>
+<p id="en-us_topic_0127489529__p21892752716">Select <strong id="en-us_topic_0127489529__b1473363111231">Direct Connect</strong> if the servers that are connected to a VPC through Direct Connect in your data center need to access the Internet.</p>
+</td>
+</tr>
+<tr id="en-us_topic_0127489529__en-us_topic_0127293981_row5681056546"><td class="cellrowborder" valign="top" width="18.01%" headers="mcps1.3.3.2.6.2.2.4.1.1 "><p id="en-us_topic_0127489529__en-us_topic_0127293981_p26815562411">Type</p>
+</td>
+<td class="cellrowborder" valign="top" width="30.91%" headers="mcps1.3.3.2.6.2.2.4.1.2 "><p id="en-us_topic_0127489529__p10582494228">This parameter is available only when you select <strong id="en-us_topic_0127489529__b1814518360">VPC</strong> for <strong id="en-us_topic_0127489529__b1112543615">Scenario</strong>.</p>
+</td>
+<td class="cellrowborder" valign="top" width="51.080000000000005%" headers="mcps1.3.3.2.6.2.2.4.1.3 "><p id="en-us_topic_0127489529__en-us_topic_0127293981_p206811656248">You can set it to <strong id="en-us_topic_0127489529__b1557628124418">Subnet</strong> or <strong id="en-us_topic_0127489529__b357152824410">Custom</strong> based on service requirements.</p>
+<p id="en-us_topic_0127489529__p12207182812381">Select <strong id="en-us_topic_0127489529__b1646181161514">Subnet</strong> if all servers in a VPC subnet need to access the Internet through the SNAT rule.</p>
+<p id="en-us_topic_0127489529__p18916248300">Select <strong id="en-us_topic_0127489529__b1320241441519">Custom</strong> if only specific servers in a VPC subnet need to access the Internet through the SNAT rule.</p>
+</td>
+</tr>
+<tr id="en-us_topic_0127489529__en-us_topic_0127293981_row3209331417597"><td class="cellrowborder" valign="top" width="18.01%" headers="mcps1.3.3.2.6.2.2.4.1.1 "><p id="en-us_topic_0127489529__en-us_topic_0127293981_p4942162717597">Subnet</p>
+</td>
+<td class="cellrowborder" valign="top" width="30.91%" headers="mcps1.3.3.2.6.2.2.4.1.2 "><p id="en-us_topic_0127489529__p360149192215">This parameter is available only when you select <strong id="en-us_topic_0127489529__b18244173914362">VPC</strong> for <strong id="en-us_topic_0127489529__b32491839123612">Scenario</strong>, and <strong id="en-us_topic_0127489529__b1249143919363">Subnet</strong> for <strong id="en-us_topic_0127489529__b1524914391368">Type</strong>.</p>
+</td>
+<td class="cellrowborder" valign="top" width="51.080000000000005%" headers="mcps1.3.3.2.6.2.2.4.1.3 "><p id="en-us_topic_0127489529__en-us_topic_0127293981_p4372884917597">The subnet in which servers can access the Internet through the SNAT rule.</p>
+</td>
+</tr>
+<tr id="en-us_topic_0127489529__en-us_topic_0127293981_row5801532217597"><td class="cellrowborder" valign="top" width="18.01%" headers="mcps1.3.3.2.6.2.2.4.1.1 "><p id="en-us_topic_0127489529__p02871145345"><span id="en-us_topic_0127489529__text437564583717">EIP</span><span id="en-us_topic_0127489529__text1537514450373"></span></p>
+</td>
+<td class="cellrowborder" valign="top" width="30.91%" headers="mcps1.3.3.2.6.2.2.4.1.2 "><ul id="en-us_topic_0127489529__ul12621049122212"><li id="en-us_topic_0127489529__li2063949162213">This parameter is available only when you select <strong id="en-us_topic_0127489529__b1365915811132">VPC</strong> for <strong id="en-us_topic_0127489529__b186641583133">Scenario</strong>.</li><li id="en-us_topic_0127489529__li7641749172213">This parameter is available only when you select <strong id="en-us_topic_0127489529__b5506601411">Direct Connect</strong> for <strong id="en-us_topic_0127489529__b185066161415">Scenario</strong>.</li></ul>
+</td>
+<td class="cellrowborder" valign="top" width="51.080000000000005%" headers="mcps1.3.3.2.6.2.2.4.1.3 "><p id="en-us_topic_0127489529__en-us_topic_0127293981_p94462428451">The EIP used for accessing the Internet.</p>
+<p id="en-us_topic_0127489529__en-us_topic_0127293981_p578114194614">You can select an EIP that either is not bound to any resource, has been bound to a DNAT rule with <strong id="en-us_topic_0127489529__b187051038301">Port Type</strong> set to <strong id="en-us_topic_0127489529__b1870518381020">Specific port</strong> of the current NAT gateway, or has been bound to an SNAT rule of the current NAT gateway.</p>
+</td>
+</tr>
+</tbody>
+</table>
+</div>
+</li><li id="en-us_topic_0127489529__en-us_topic_0127293981_li19260431201611">Click <strong id="en-us_topic_0127489529__b13831874812">OK</strong>.<div class="note" id="en-us_topic_0127489529__en-us_topic_0127293981_note1743805264711"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="en-us_topic_0127489529__en-us_topic_0127293981_p14386528472">You can add multiple SNAT rules for a NAT gateway to suite your service requirements.</p>
+</div></div>
+</li></ol>
+</div>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_snat_0000.html">Managing SNAT Rules</a></div>
+</div>
+</div>
+

docs/natgw/umn/en-us_topic_0127489530.html

@@ -0,0 +1,71 @@
+<a name="en-us_topic_0127489530"></a><a name="en-us_topic_0127489530"></a>
+
+<h1 class="topictitle1">Adding a DNAT Rule</h1>
+<div id="body8662426"><div class="section" id="en-us_topic_0127489530__en-us_topic_0127293986_section1272311025717"><h4 class="sectiontitle">Scenarios</h4><p id="en-us_topic_0127489530__en-us_topic_0127293986_p2098647195715">After a NAT gateway is created, you can add DNAT rules to allow servers in your VPC to provide services accessible from the Internet.</p>
+<p id="en-us_topic_0127489530__en-us_topic_0127293986_p5686195618474">You can configure only one DNAT rule for each port of a server. One port can be mapped to only one EIP. If multiple servers need to provide services accessible from the Internet, create multiple DNAT rules.</p>
+</div>
+<div class="section" id="en-us_topic_0127489530__en-us_topic_0127293986_section36544171152448"><h4 class="sectiontitle">Prerequisites</h4><p id="en-us_topic_0127489530__en-us_topic_0127293986_p2560058615252">A NAT gateway has been created.</p>
+</div>
+<div class="section" id="en-us_topic_0127489530__en-us_topic_0127293986_section61166376152513"><h4 class="sectiontitle">Procedure</h4><ol id="en-us_topic_0127489530__en-us_topic_0127293986_ol59255157152617"><li id="en-us_topic_0127489530__en-us_topic_0127293986_li63534365152617">Log in to the management console.</li><li id="en-us_topic_0127489530__en-us_topic_0127293986_li840318282158">Click <span><img id="en-us_topic_0127489530__en-us_topic_0118498823_image338921514480" src="en-us_image_0141273034.png"></span> in the upper left corner and select the desired region and project.</li><li id="en-us_topic_0127489530__en-us_topic_0127293986_li1049617094325">Under <strong id="en-us_topic_0127489530__b147154310545">Network</strong>, choose <strong id="en-us_topic_0127489530__b194711843175412">NAT Gateway</strong>.</li><li id="en-us_topic_0127489530__en-us_topic_0127293986_li8610102724918">On the displayed page, click the name of the NAT gateway for which you want to add the DNAT rule.</li><li id="en-us_topic_0127489530__en-us_topic_0127293986_li188821748185212">On the NAT gateway details page, click the <strong id="en-us_topic_0127489530__b124202481546">DNAT Rules</strong> tab.</li><li id="en-us_topic_0127489530__en-us_topic_0127293986_li7563844165416">Click <strong id="en-us_topic_0127489530__b18950165119541">Add DNAT Rule</strong>.<div class="notice" id="en-us_topic_0127489530__note8499857814"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="en-us_topic_0127489530__p7499175712111">Add security group rules to allow inbound or outbound traffic after you add a DNAT rule. Otherwise, the DNAT rule does not take effect.</p>
+</div></div>
+<div class="fignone" id="en-us_topic_0127489530__fig34824518713"><span class="figcap"><b>Figure 1 </b>Add DNAT Rule</span><br><span><img id="en-us_topic_0127489530__nat_qs_0010_image15489314494" src="en-us_image_0201532842.png"></span></div>
+<p id="en-us_topic_0127489530__en-us_topic_0127293986_p575717274335"></p>
+</li><li id="en-us_topic_0127489530__en-us_topic_0127293986_li54168351144127">Configure the parameters as prompted. For details, see <a href="#en-us_topic_0127489530__en-us_topic_0127293986_table30787259144637">Table 1</a>.
+<div class="tablenoborder"><a name="en-us_topic_0127489530__en-us_topic_0127293986_table30787259144637"></a><a name="en-us_topic_0127293986_table30787259144637"></a><table cellpadding="4" cellspacing="0" summary="" id="en-us_topic_0127489530__en-us_topic_0127293986_table30787259144637" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Parameter descriptions</caption><thead align="left"><tr id="en-us_topic_0127489530__en-us_topic_0127293986_row1287982144637"><th align="left" class="cellrowborder" valign="top" width="23.189999999999998%" id="mcps1.3.3.2.7.2.2.3.1.1"><p id="en-us_topic_0127489530__en-us_topic_0127293986_p66523784144637"><strong id="en-us_topic_0127489530__b9146819105510">Parameter</strong></p>
+</th>
+<th align="left" class="cellrowborder" valign="top" width="76.81%" id="mcps1.3.3.2.7.2.2.3.1.2"><p id="en-us_topic_0127489530__en-us_topic_0127293986_p19717393144637"><strong id="en-us_topic_0127489530__b6509122011557">Description</strong></p>
+</th>
+</tr>
+</thead>
+<tbody><tr id="en-us_topic_0127489530__en-us_topic_0127293986_row20452749101411"><td class="cellrowborder" valign="top" width="23.189999999999998%" headers="mcps1.3.3.2.7.2.2.3.1.1 "><p id="en-us_topic_0127489530__en-us_topic_0127293986_p930811171516">Scenario</p>
+</td>
+<td class="cellrowborder" valign="top" width="76.81%" headers="mcps1.3.3.2.7.2.2.3.1.2 "><p id="en-us_topic_0127489530__en-us_topic_0127293986_p82551491578"><strong id="en-us_topic_0127489530__b1866114817401">VPC</strong>: Servers in the VPC can share an EIP to provide services accessible from the Internet through the DNAT rule.</p>
+<p id="en-us_topic_0127489530__p191738561313"><strong id="en-us_topic_0127489530__b11989191519286">Direct Connect</strong>: Servers in your data center that are connected to a VPC using Direct Connect or VPN can provide services accessible from the Internet through the DNAT rule.</p>
+</td>
+</tr>
+<tr id="en-us_topic_0127489530__en-us_topic_0127293986_row1895714384610"><td class="cellrowborder" valign="top" width="23.189999999999998%" headers="mcps1.3.3.2.7.2.2.3.1.1 "><p id="en-us_topic_0127489530__en-us_topic_0127293986_p11008481568">Port Type</p>
+</td>
+<td class="cellrowborder" valign="top" width="76.81%" headers="mcps1.3.3.2.7.2.2.3.1.2 "><p id="en-us_topic_0127489530__en-us_topic_0127293986_p181028481868">The port type. You can select <strong id="en-us_topic_0127489530__b443774413416">All ports</strong> or <strong id="en-us_topic_0127489530__b1544244420410">Specific port</strong>.</p>
+<ul id="en-us_topic_0127489530__ul410617281189"><li id="en-us_topic_0127489530__li171068280188"><strong id="en-us_topic_0127489530__b48629492411">All ports</strong>: This is equivalent to assigning an EIP to a server. Any requests on the EIP will be forwarded by the NAT gateway to your server based on IP address mapping.</li><li id="en-us_topic_0127489530__li8824123041812"><strong id="en-us_topic_0127489530__b1085841656">Specific port</strong>: The NAT gateway only forwards requests with a specific protocol and port on the EIP to the corresponding port of the target server.</li></ul>
+</td>
+</tr>
+<tr id="en-us_topic_0127489530__en-us_topic_0127293986_row13591056167"><td class="cellrowborder" valign="top" width="23.189999999999998%" headers="mcps1.3.3.2.7.2.2.3.1.1 "><p id="en-us_topic_0127489530__en-us_topic_0127293986_p42842275144637">Protocol</p>
+</td>
+<td class="cellrowborder" valign="top" width="76.81%" headers="mcps1.3.3.2.7.2.2.3.1.2 "><p id="en-us_topic_0127489530__en-us_topic_0127293986_p1747101415356">The protocol can be TCP or UDP. This parameter is available if you select <strong id="en-us_topic_0127489530__b07761805311">Specific port</strong> for <strong id="en-us_topic_0127489530__b1977161845317">Port Type</strong>. If you select <strong id="en-us_topic_0127489530__b97701885316">All ports</strong>, the value of this parameter will be <strong id="en-us_topic_0127489530__b1578181805311">All</strong> by default.</p>
+</td>
+</tr>
+<tr id="en-us_topic_0127489530__en-us_topic_0127293986_row43238809144637"><td class="cellrowborder" valign="top" width="23.189999999999998%" headers="mcps1.3.3.2.7.2.2.3.1.1 "><p id="en-us_topic_0127489530__en-us_topic_0127293986_p1901342115116"><span id="en-us_topic_0127489530__text437564583717">EIP</span><span id="en-us_topic_0127489530__text1537514450373"></span></p>
+</td>
+<td class="cellrowborder" valign="top" width="76.81%" headers="mcps1.3.3.2.7.2.2.3.1.2 "><p id="en-us_topic_0127489530__en-us_topic_0127293986_p480029104814">The EIP that will be used by the server to provide services accessible from the Internet.</p>
+<p id="en-us_topic_0127489530__en-us_topic_0127293981_p578114194614">You can select an EIP that either is not bound to any resource, has been bound to a DNAT rule with <strong id="en-us_topic_0127489530__b1453623719512">Port Type</strong> set to <strong id="en-us_topic_0127489530__b1454183712517">Specific port</strong> of the current NAT gateway, or has been bound to an SNAT rule of the current NAT gateway.</p>
+</td>
+</tr>
+<tr id="en-us_topic_0127489530__en-us_topic_0127293986_row189841183384"><td class="cellrowborder" valign="top" width="23.189999999999998%" headers="mcps1.3.3.2.7.2.2.3.1.1 "><p id="en-us_topic_0127489530__en-us_topic_0127293986_p89861618173810">Outside Port</p>
+</td>
+<td class="cellrowborder" valign="top" width="76.81%" headers="mcps1.3.3.2.7.2.2.3.1.2 "><p id="en-us_topic_0127489530__p18986618153813">The port of the EIP. This parameter is available if you select <strong id="en-us_topic_0127489530__b10538124224010">Specific port</strong> for <strong id="en-us_topic_0127489530__b553911429409">Port Type</strong>. Value range: 1–65535</p>
+<p id="en-us_topic_0127489530__p1213391252">You can enter a single port number, for example, 80.</p>
+</td>
+</tr>
+<tr id="en-us_topic_0127489530__en-us_topic_0127293986_row35593477144637"><td class="cellrowborder" valign="top" width="23.189999999999998%" headers="mcps1.3.3.2.7.2.2.3.1.1 "><p id="en-us_topic_0127489530__en-us_topic_0127293986_p64499384144637">Private IP Address</p>
+</td>
+<td class="cellrowborder" valign="top" width="76.81%" headers="mcps1.3.3.2.7.2.2.3.1.2 "><ul id="en-us_topic_0127489530__ul6112191010186"><li id="en-us_topic_0127489530__li17112210191812">In a VPC scenario, set this parameter to the IP address of the server in a VPC. This IP address is used by the server to provide services accessible from the Internet through DNAT.</li><li id="en-us_topic_0127489530__li147761202515">In a Direct Connect scenario, set this parameter to the IP address of the server in the local data center or the user's private IP address. This IP address is used by local servers that are connected to a VPC through Direct Connect or VPN to provide services accessible from the Internet through DNAT.</li><li id="en-us_topic_0127489530__li56365613251">Configure the port of <strong id="en-us_topic_0127489530__b842352706174822">Private IP Address</strong> if you select <strong id="en-us_topic_0127489530__b2915537113914">Specific port</strong> for <strong id="en-us_topic_0127489530__b119151372397">Port Type</strong>.</li></ul>
+</td>
+</tr>
+<tr id="en-us_topic_0127489530__en-us_topic_0127293986_row1423724123219"><td class="cellrowborder" valign="top" width="23.189999999999998%" headers="mcps1.3.3.2.7.2.2.3.1.1 "><p id="en-us_topic_0127489530__en-us_topic_0127293986_p1323715410320">Inside Port</p>
+</td>
+<td class="cellrowborder" valign="top" width="76.81%" headers="mcps1.3.3.2.7.2.2.3.1.2 "><p id="en-us_topic_0127489530__p4994201474513">The port of the server that provides services accessible from the Internet through the DNAT rule. This parameter is available if you select <strong id="en-us_topic_0127489530__b9607165012400">Specific port</strong> for <strong id="en-us_topic_0127489530__b8608135034016">Port Type</strong>. Value range: 1–65535</p>
+<p id="en-us_topic_0127489530__p22373473214">You can enter a single port number, for example, 80.</p>
+</td>
+</tr>
+</tbody>
+</table>
+</div>
+</li><li id="en-us_topic_0127489530__en-us_topic_0127293986_li559079041556">After the configuration is complete, click <strong id="en-us_topic_0127489530__b575233314183">OK</strong>. Once the rule is created, its status changes to <strong id="en-us_topic_0127489530__b19752113317189">Running</strong>.</li></ol>
+</div>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_dnat_0000.html">Managing DNAT Rules</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_01_0001.html

@@ -0,0 +1,18 @@
+<a name="nat_01_0001"></a><a name="nat_01_0001"></a>
+
+<h1 class="topictitle1">Modifying a NAT Gateway</h1>
+<div id="body1516611239704"><div class="section" id="nat_01_0001__section5439700611149"><h4 class="sectiontitle">Scenarios</h4><p id="nat_01_0001__p4055678211159">This section describes how to modify the name, type, or description of a NAT gateway.</p>
+<p id="nat_01_0001__p11993153883912">Increasing the size of the NAT gateway type does not affect services, but if you switch to a smaller NAT gateway, make sure the reduced capacity will still be enough to meet your service requirements.</p>
+</div>
+<div class="section" id="nat_01_0001__section24081145174428"><h4 class="sectiontitle">Prerequisites</h4><p id="nat_01_0001__p58721079174435">A NAT gateway has been created.</p>
+</div>
+<div class="section" id="nat_01_0001__section25378358174522"><h4 class="sectiontitle">Procedure</h4><ol id="nat_01_0001__ol37874592165515"><li id="nat_01_0001__li7332756163236">Log in to the management console.</li><li id="nat_01_0001__li840318282158">Click <span><img id="nat_01_0001__en-us_topic_0118498823_image338921514480" src="en-us_image_0141273034.png"></span> in the upper left corner and select the desired region and project.</li><li id="nat_01_0001__li1049617094325">Under <strong id="nat_01_0001__b6538202603012">Network</strong>, choose <strong id="nat_01_0001__b2539112619308">NAT Gateway</strong>.</li><li id="nat_01_0001__li8610102724918">On the displayed page, locate the row that contains the target NAT gateway and click <strong id="nat_01_0001__b2807143213502">Modify</strong> in the <strong id="nat_01_0001__b11242836195014">Operation</strong> column.</li><li id="nat_01_0001__li5535256111148">Modify the name, type, or description of the NAT gateway as prompted.<p id="nat_01_0001__p42090456113428"><a name="nat_01_0001__li5535256111148"></a><a name="li5535256111148"></a></p>
+</li><li id="nat_01_0001__li1596314397533">Click <strong id="nat_01_0001__b5682170205316">Next</strong>.</li><li id="nat_01_0001__li166843965418">Click <strong id="nat_01_0001__b1835750836">Submit</strong>.</li></ol>
+</div>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_nat_0000.html">Managing NAT Gateways</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_az_0000.html

@@ -0,0 +1,22 @@
+<a name="nat_az_0000"></a><a name="nat_az_0000"></a>
+
+<h1 class="topictitle1">Region and AZ</h1>
+<div id="body32001227"><div class="section" id="nat_az_0000__en-us_topic_0184026189_section388255972712"><h4 class="sectiontitle">Concept</h4><p id="nat_az_0000__en-us_topic_0184026189_p212716216381">A region and availability zone (AZ) identify the location of a data center. You can create resources in a specific region and AZ.</p>
+<ul id="nat_az_0000__en-us_topic_0184026189_ul86578533460"><li id="nat_az_0000__en-us_topic_0184026189_li14657175334618">A region is a physical data center, which is completely isolated to improve fault tolerance and stability. The region that is selected during resource creation cannot be changed after the resource is created.</li><li id="nat_az_0000__en-us_topic_0184026189_li45875020473">An AZ is a physical location where resources use independent power supplies and networks. A region contains one or more AZs that are physically isolated but interconnected through internal networks. Because AZs are isolated from each other, any fault that occurs in one AZ will not affect others.</li></ul>
+<p id="nat_az_0000__en-us_topic_0184026189_p1479174514614"><a href="#nat_az_0000__en-us_topic_0184026189_fig8747114281212">Figure 1</a> shows the relationship between regions and AZs.</p>
+<div class="fignone" id="nat_az_0000__en-us_topic_0184026189_fig8747114281212"><a name="nat_az_0000__en-us_topic_0184026189_fig8747114281212"></a><a name="en-us_topic_0184026189_fig8747114281212"></a><span class="figcap"><b>Figure 1 </b>Regions and AZs</span><br><span><img class="vsd" id="nat_az_0000__en-us_topic_0184026189_image12748194211128" src="en-us_image_0184026531.png"></span></div>
+</div>
+<div class="section" id="nat_az_0000__en-us_topic_0184026189_section67281149192216"><h4 class="sectiontitle">Selecting a Region</h4><p id="nat_az_0000__en-us_topic_0184026189_p68521454132212">Select a region closest to your target users for lower network latency and quick access.</p>
+</div>
+<div class="section" id="nat_az_0000__en-us_topic_0184026189_section193971112578"><h4 class="sectiontitle">Selecting an AZ</h4><p id="nat_az_0000__en-us_topic_0184026189_p859161416717">When deploying resources, consider your applications' requirements on disaster recovery (DR) and network latency.</p>
+<ul id="nat_az_0000__en-us_topic_0184026189_ul157203571473"><li id="nat_az_0000__en-us_topic_0184026189_li7720175710711">For high DR capability, deploy resources in different AZs within the same region.</li><li id="nat_az_0000__en-us_topic_0184026189_li109763595719">For lower network latency, deploy resources in the same AZ.</li></ul>
+</div>
+<div class="section" id="nat_az_0000__en-us_topic_0184026189_section1110135820407"><h4 class="sectiontitle">Regions and Endpoints</h4><p id="nat_az_0000__en-us_topic_0184026189_p361784821111">Before you use an API to call resources, specify its region and endpoint. For more details, see <a href="https://docs.otc.t-systems.com/en-us/endpoint/index.html" target="_blank" rel="noopener noreferrer">Regions and Endpoints</a>.</p>
+</div>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_pro_0000.html">Overview</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_ces_0001.html

@@ -0,0 +1,15 @@
+<a name="nat_ces_0001"></a><a name="nat_ces_0001"></a>
+
+<h1 class="topictitle1">Monitoring Management</h1>
+<div id="body1571370797745"></div>
+<div>
+<ul class="ullinks">
+<li class="ulchildlink"><strong><a href="nat_ces_0002.html">Supported Metrics</a></strong><br>
+</li>
+<li class="ulchildlink"><strong><a href="en-us_topic_0113772081.html">Creating Alarm Rules</a></strong><br>
+</li>
+<li class="ulchildlink"><strong><a href="nat_ces_0003.html">Viewing Metrics</a></strong><br>
+</li>
+</ul>
+</div>
+

docs/natgw/umn/nat_ces_0002.html

@@ -0,0 +1,81 @@
+<a name="nat_ces_0002"></a><a name="nat_ces_0002"></a>
+
+<h1 class="topictitle1">Supported Metrics</h1>
+<div id="body1527071529095"><div class="section" id="nat_ces_0002__section352319314226"><h4 class="sectiontitle">Description</h4><p id="nat_ces_0002__p91347331115">This section describes metrics reported by NAT Gateway to Cloud Eye as well as their namespaces, monitoring metrics, and dimensions. You can use the management console or the APIs provided by Cloud Eye to query the metrics generated for NAT Gateway.</p>
+</div>
+<div class="section" id="nat_ces_0002__section48641254172217"><h4 class="sectiontitle">Namespace</h4><p id="nat_ces_0002__en-us_topic_0102475743_p193313161110">SYS.NAT</p>
+</div>
+<div class="section" id="nat_ces_0002__section1954874112249"><h4 class="sectiontitle">Metrics</h4>
+<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="nat_ces_0002__table102675383222" frame="border" border="1" rules="all"><thead align="left"><tr id="nat_ces_0002__row726893842214"><th align="left" class="cellrowborder" valign="top" width="11.881188118811881%" id="mcps1.3.3.2.1.7.1.1"><p id="nat_ces_0002__p20269183892219"><strong id="nat_ces_0002__b2632172310345">Metric</strong></p>
+</th>
+<th align="left" class="cellrowborder" valign="top" width="10.891089108910892%" id="mcps1.3.3.2.1.7.1.2"><p id="nat_ces_0002__p16270153816220"><strong id="nat_ces_0002__b11883142563415">Name</strong></p>
+</th>
+<th align="left" class="cellrowborder" valign="top" width="20.792079207920793%" id="mcps1.3.3.2.1.7.1.3"><p id="nat_ces_0002__p527115383221"><strong id="nat_ces_0002__b84235270619454">Description</strong></p>
+</th>
+<th align="left" class="cellrowborder" valign="top" width="12.871287128712872%" id="mcps1.3.3.2.1.7.1.4"><p id="nat_ces_0002__p202711238192210"><strong id="nat_ces_0002__b84235270621366">Value Range</strong></p>
+</th>
+<th align="left" class="cellrowborder" valign="top" width="20.792079207920793%" id="mcps1.3.3.2.1.7.1.5"><p id="nat_ces_0002__p52723385226"><strong id="nat_ces_0002__b29933953513">Measurement Object &amp; Dimension</strong></p>
+</th>
+<th align="left" class="cellrowborder" valign="top" width="22.772277227722775%" id="mcps1.3.3.2.1.7.1.6"><p id="nat_ces_0002__p12656105763615"><strong id="nat_ces_0002__b426716527349">Monitoring Interval (Raw Data)</strong></p>
+</th>
+</tr>
+</thead>
+<tbody><tr id="nat_ces_0002__row2272193812219"><td class="cellrowborder" valign="top" width="11.881188118811881%" headers="mcps1.3.3.2.1.7.1.1 "><p id="nat_ces_0002__p149641356171117">snat_connection</p>
+</td>
+<td class="cellrowborder" valign="top" width="10.891089108910892%" headers="mcps1.3.3.2.1.7.1.2 "><p id="nat_ces_0002__p59647568111">SNAT Connections</p>
+</td>
+<td class="cellrowborder" valign="top" width="20.792079207920793%" headers="mcps1.3.3.2.1.7.1.3 "><p id="nat_ces_0002__p14964956111116">Number of SNAT connections of the NAT gateway</p>
+<p id="nat_ces_0002__p7369230172013">Unit: Count</p>
+</td>
+<td class="cellrowborder" valign="top" width="12.871287128712872%" headers="mcps1.3.3.2.1.7.1.4 "><p id="nat_ces_0002__p896412563116">≥ 0</p>
+</td>
+<td class="cellrowborder" valign="top" width="20.792079207920793%" headers="mcps1.3.3.2.1.7.1.5 "><p id="nat_ces_0002__p1964356101112">Measurement object: NAT gateway</p>
+<p id="nat_ces_0002__p823153843717">Dimension:</p>
+<p id="nat_ces_0002__p125462015382">nat_gateway_id</p>
+</td>
+<td class="cellrowborder" valign="top" width="22.772277227722775%" headers="mcps1.3.3.2.1.7.1.6 "><p id="nat_ces_0002__p765645713612">1 minute</p>
+</td>
+</tr>
+<tr id="nat_ces_0002__row1348614455913"><td class="cellrowborder" valign="top" width="11.881188118811881%" headers="mcps1.3.3.2.1.7.1.1 "><p id="nat_ces_0002__p748617451398">Server IP address set</p>
+</td>
+<td class="cellrowborder" valign="top" width="10.891089108910892%" headers="mcps1.3.3.2.1.7.1.2 "><p id="nat_ces_0002__p62811656991">Monitoring Details of Top 10</p>
+</td>
+<td class="cellrowborder" valign="top" width="20.792079207920793%" headers="mcps1.3.3.2.1.7.1.3 "><p id="nat_ces_0002__p92811561694">IP addresses of the top 10 servers that occupy the most SNAT connections</p>
+<p id="nat_ces_0002__p853183420433">Unit: Count</p>
+</td>
+<td class="cellrowborder" valign="top" width="12.871287128712872%" headers="mcps1.3.3.2.1.7.1.4 "><p id="nat_ces_0002__p1528116561917">≥ 0</p>
+</td>
+<td class="cellrowborder" valign="top" width="20.792079207920793%" headers="mcps1.3.3.2.1.7.1.5 "><p id="nat_ces_0002__p57816332325">Measurement object: NAT gateway</p>
+<p id="nat_ces_0002__p153301940183513">Dimension:</p>
+<p id="nat_ces_0002__p93301940163514">nat_gateway_id</p>
+</td>
+<td class="cellrowborder" valign="top" width="22.772277227722775%" headers="mcps1.3.3.2.1.7.1.6 "><p id="nat_ces_0002__p1148634517920">1 minute</p>
+</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+<div class="section" id="nat_ces_0002__section11173113215254"><h4 class="sectiontitle">Dimensions</h4>
+<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="nat_ces_0002__en-us_topic_0102475743_table13291038182217" frame="border" border="1" rules="all"><thead align="left"><tr id="nat_ces_0002__en-us_topic_0102475743_row13292153862219"><th align="left" class="cellrowborder" valign="top" width="40.400000000000006%" id="mcps1.3.4.2.1.3.1.1"><p id="nat_ces_0002__en-us_topic_0102475743_p17292638192211">Key</p>
+</th>
+<th align="left" class="cellrowborder" valign="top" width="59.599999999999994%" id="mcps1.3.4.2.1.3.1.2"><p id="nat_ces_0002__en-us_topic_0102475743_p92938385226">Value</p>
+</th>
+</tr>
+</thead>
+<tbody><tr id="nat_ces_0002__en-us_topic_0102475743_row1429373812228"><td class="cellrowborder" valign="top" width="40.400000000000006%" headers="mcps1.3.4.2.1.3.1.1 "><p id="nat_ces_0002__en-us_topic_0102475743_p11777171991217">nat_gateway_id</p>
+</td>
+<td class="cellrowborder" valign="top" width="59.599999999999994%" headers="mcps1.3.4.2.1.3.1.2 "><p id="nat_ces_0002__en-us_topic_0102475743_p11777101931217">NAT gateway ID</p>
+</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_ces_0001.html">Monitoring Management</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_ces_0003.html

@@ -0,0 +1,18 @@
+<a name="nat_ces_0003"></a><a name="nat_ces_0003"></a>
+
+<h1 class="topictitle1">Viewing Metrics</h1>
+<div id="body1527071529095"><div class="section" id="nat_ces_0003__en-us_topic_0027371530_section8439794224022"><h4 class="sectiontitle">Prerequisites</h4><ul id="nat_ces_0003__en-us_topic_0027371530_ul3164004322451"><li id="nat_ces_0003__li14876037123711">The NAT gateway is running properly and SNAT rules have been created.</li><li id="nat_ces_0003__en-us_topic_0027371530_li6253115215042">It can take a period of time to obtain and transfer the monitoring data. Therefore, wait for a while and then check the data.</li></ul>
+</div>
+<div class="section" id="nat_ces_0003__section53841197455"><h4 class="sectiontitle">Scenarios</h4><p id="nat_ces_0003__p964131413450">This section describes how to view NAT Gateway metrics.</p>
+</div>
+<div class="section" id="nat_ces_0003__en-us_topic_0027371530_section44667294224513"><h4 class="sectiontitle">Procedure</h4><ol id="nat_ces_0003__en-us_topic_0027371530_ol52641911224530"><li id="nat_ces_0003__en-us_topic_0027371530_li4015157224530">Log in to the management console.</li><li id="nat_ces_0003__li45573243468">In the upper left corner, select the target region.</li><li id="nat_ces_0003__en-us_topic_0027371530_li56082099224530">Under <strong id="nat_ces_0003__b11805117198">Management &amp; Deployment</strong>, select <strong id="nat_ces_0003__b1719151151917">Cloud Eye</strong>.</li><li id="nat_ces_0003__li8839354101513">In the navigation pane on the left, choose <strong id="nat_ces_0003__b1364526653141156">Cloud Service Monitoring</strong> &gt; <strong id="nat_ces_0003__b842352706125643">NAT Gateway</strong>.</li><li id="nat_ces_0003__li144940413176">Locate the row that contains the target metric and click <strong id="nat_ces_0003__b11461771468">View Metric</strong> in the <strong id="nat_ces_0003__b842352706125827">Operation</strong> column to check detailed information.<p id="nat_ces_0003__p1654217277316">You can view data of the last one, three, or twelve hours.</p>
+</li></ol>
+<p id="nat_ces_0003__p890810251115"></p>
+</div>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_ces_0001.html">Monitoring Management</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_dnat_0000.html

@@ -0,0 +1,15 @@
+<a name="nat_dnat_0000"></a><a name="nat_dnat_0000"></a>
+
+<h1 class="topictitle1">Managing DNAT Rules</h1>
+<div id="body1535076970938"></div>
+<div>
+<ul class="ullinks">
+<li class="ulchildlink"><strong><a href="en-us_topic_0127489530.html">Adding a DNAT Rule</a></strong><br>
+</li>
+<li class="ulchildlink"><strong><a href="nat_dnat_0001.html">Viewing a DNAT Rule</a></strong><br>
+</li>
+<li class="ulchildlink"><strong><a href="nat_dnat_0003.html">Deleting a DNAT Rule</a></strong><br>
+</li>
+</ul>
+</div>
+

docs/natgw/umn/nat_dnat_0001.html

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+<a name="nat_dnat_0001"></a><a name="nat_dnat_0001"></a>
+
+<h1 class="topictitle1">Viewing a DNAT Rule</h1>
+<div id="body1535076970938"><div class="section" id="nat_dnat_0001__section5439700611149"><h4 class="sectiontitle">Scenarios</h4><p id="nat_dnat_0001__p4055678211159">After you add a DNAT rule to a NAT gateway, you can view the details about the DNAT rule.</p>
+</div>
+<div class="section" id="nat_dnat_0001__section24081145174428"><h4 class="sectiontitle">Prerequisites</h4><p id="nat_dnat_0001__p58721079174435">A DNAT rule has been added.</p>
+</div>
+<div class="section" id="nat_dnat_0001__section1079812442237"><h4 class="sectiontitle">Procedure</h4><ol id="nat_dnat_0001__ol197671938162712"><li id="nat_dnat_0001__li7332756163236">Log in to the management console.</li><li id="nat_dnat_0001__li840318282158">Click <span><img id="nat_dnat_0001__en-us_topic_0118498823_image338921514480" src="en-us_image_0141273034.png"></span> in the upper left corner and select the desired region and project.</li><li id="nat_dnat_0001__li1049617094325">Under <strong id="nat_dnat_0001__b834121235420">Network</strong>, choose <strong id="nat_dnat_0001__b133471212546">NAT Gateway</strong>.</li><li id="nat_dnat_0001__li8610102724918">On the displayed page, click the name of the target NAT gateway.</li><li id="nat_dnat_0001__li5876112162910">On the NAT gateway details page, click the <strong id="nat_dnat_0001__b864153198">DNAT Rules</strong> tab.</li><li id="nat_dnat_0001__li11380125912473">In the DNAT rule list, view the details about the DNAT rule.</li></ol>
+</div>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_dnat_0000.html">Managing DNAT Rules</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_dnat_0003.html

@@ -0,0 +1,16 @@
+<a name="nat_dnat_0003"></a><a name="nat_dnat_0003"></a>
+
+<h1 class="topictitle1">Deleting a DNAT Rule</h1>
+<div id="body1523344964082"><div class="section" id="nat_dnat_0003__section44788855152716"><h4 class="sectiontitle">Scenarios</h4><p id="nat_dnat_0003__p4622986152723">Delete a DNAT rule that you no longer need.</p>
+</div>
+<div class="section" id="nat_dnat_0003__section45365749152921"><h4 class="sectiontitle">Prerequisites</h4><p id="nat_dnat_0003__p55701220152933">A DNAT rule has been added for the NAT gateway.</p>
+</div>
+<div class="section" id="nat_dnat_0003__section30069985153038"><h4 class="sectiontitle">Procedure</h4><ol id="nat_dnat_0003__ol58162347153051"><li id="nat_dnat_0003__li7332756163236">Log in to the management console.</li><li id="nat_dnat_0003__li840318282158">Click <span><img id="nat_dnat_0003__en-us_topic_0118498823_image338921514480" src="en-us_image_0141273034.png"></span> in the upper left corner and select the desired region and project.</li><li id="nat_dnat_0003__li1049617094325">Under <strong id="nat_dnat_0003__b108754173200">Network</strong>, choose <strong id="nat_dnat_0003__b1875517172020">NAT Gateway</strong>.</li><li id="nat_dnat_0003__li8610102724918">On the displayed page, click the name of the target NAT gateway.</li><li id="nat_dnat_0003__li17425138164911">On the NAT gateway details page, click the <strong id="nat_dnat_0003__b8170142416100">DNAT Rules</strong> tab.</li><li id="nat_dnat_0003__li190116535015">In the DNAT rule list, locate the row that contains the DNAT rule you want to delete and click <strong id="nat_dnat_0003__b842352706131525">Delete</strong> in the <strong id="nat_dnat_0003__b842352706131528">Operation</strong> column.</li><li id="nat_dnat_0003__li8835108115112">In the displayed dialog box, click <strong id="nat_dnat_0003__b131796444489">Yes</strong>.</li></ol>
+</div>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_dnat_0000.html">Managing DNAT Rules</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_faq_0000.html

@@ -0,0 +1,15 @@
+<a name="nat_faq_0000"></a><a name="nat_faq_0000"></a>
+
+<h1 class="topictitle1">FAQs</h1>
+<div id="body59896629"></div>
+<div>
+<ul class="ullinks">
+<li class="ulchildlink"><strong><a href="nat_faq_0100.html">NAT Gateway</a></strong><br>
+</li>
+<li class="ulchildlink"><strong><a href="nat_faq_0200.html">SNAT</a></strong><br>
+</li>
+<li class="ulchildlink"><strong><a href="nat_faq_0300.html">DNAT</a></strong><br>
+</li>
+</ul>
+</div>
+

docs/natgw/umn/nat_faq_0002.html

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+<a name="nat_faq_0002"></a><a name="nat_faq_0002"></a>
+
+<h1 class="topictitle1">What Are SNAT Connections?</h1>
+<div id="body1531445624883"><p id="nat_faq_0002__p8060118">An SNAT connection consists of the source IP address, source port, destination IP address, destination port, and transmission-layer protocol. These five elements identify a connection as a unique session. The source IP address refers to the EIP, and the source port refers to the EIP port. They will be used to access the destination IP address and port of the Internet.</p>
+<p id="nat_faq_0002__p20617117185216">SNAT supports three protocols: TCP, UDP, and ICMP. A NAT gateway supports up to 55,000 concurrent connections for each destination IP address and port. If any of the destination IP address, port number, and protocol (TCP/UDP/ICMP) changes, you can create another 55,000 connections. The number of connections you query on an ECS may be different from the actual number of SNAT connections. (You can run the <strong id="nat_faq_0002__b1651883184717">netstat</strong> command to query the number of connections.) Assume that an ECS creates 100 connections to a fixed destination every second. 55,000 connections will be used up in about 10 minutes without considering the dropped idle connections. As a result, new connections cannot be established.</p>
+<p id="nat_faq_0002__p691421205812">If there is no data packet passing through the SNAT connection for a long time, the connection will be timed out. </p>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_faq_0200.html">SNAT</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_faq_0003.html

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+<a name="nat_faq_0003"></a><a name="nat_faq_0003"></a>
+
+<h1 class="topictitle1">What Is the Relationship Between a VPC, NAT Gateway, EIP Bandwidth, and ECS?</h1>
+<div id="body1513321406402"><ul id="nat_faq_0003__ul6422493815350"><li id="nat_faq_0003__li2659561415350">A VPC is a secure, isolated, logical network environment.</li><li id="nat_faq_0003__li2193374815413">A NAT gateway enables ECSs in the VPC to access the Internet.</li><li id="nat_faq_0003__li4739003315343">EIP is a service that provides valid static IP addresses on the Internet. The throughput of a VPC is determined by the EIP bandwidth.</li><li id="nat_faq_0003__li3747920415346">An ECS is a running instance in the VPC and uses the NAT gateway to access the Internet.</li></ul>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_faq_0100.html">NAT Gateway</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_faq_0004.html

@@ -0,0 +1,11 @@
+<a name="nat_faq_0004"></a><a name="nat_faq_0004"></a>
+
+<h1 class="topictitle1">How Does A NAT Gateway Offer High Availability?</h1>
+<div id="body1513321406402"><p id="nat_faq_0004__p9411022153512">The backend of a NAT gateway supports automatic disaster recovery through hot standby, thereby reducing risks and improving availability.</p>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_faq_0100.html">NAT Gateway</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_faq_0005.html

@@ -0,0 +1,11 @@
+<a name="nat_faq_0005"></a><a name="nat_faq_0005"></a>
+
+<h1 class="topictitle1">Do the NAT Gateway and SNAT Rule Support the Update Operation?</h1>
+<div id="body1513321406402"><p id="nat_faq_0005__p24956662153532">NAT gateways can be updated. SNAT rules cannot be updated.</p>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_faq_0100.html">NAT Gateway</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_faq_0006.html

@@ -0,0 +1,11 @@
+<a name="nat_faq_0006"></a><a name="nat_faq_0006"></a>
+
+<h1 class="topictitle1">Why Is DNAT Used?</h1>
+<div id="body1557818061702"><p id="nat_faq_0006__p1054811712154">DNAT enables servers in a VPC to share an EIP to provide services accessible from the Internet through IP address mapping or port mapping.</p>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_faq_0300.html">DNAT</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_faq_0007.html

@@ -0,0 +1,11 @@
+<a name="nat_faq_0007"></a><a name="nat_faq_0007"></a>
+
+<h1 class="topictitle1">Can I Modify DNAT Rules?</h1>
+<div id="body1557817900913"><p id="nat_faq_0007__p8060118">You can modify DNAT rules.</p>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_faq_0300.html">DNAT</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_faq_001.html

@@ -0,0 +1,11 @@
+<a name="nat_faq_001"></a><a name="nat_faq_001"></a>
+
+<h1 class="topictitle1">Why Is SNAT Used?</h1>
+<div id="body1531445921401"><p id="nat_faq_001__p1380619353919">Besides requiring services provided by the system, some ECSs also need to access the Internet to obtain information or download software. However, assigning a public IP address to each ECS consumes already-limited IPv4 addresses, incurs additional costs, and may increase the attack surface in a virtual environment. Enabling multiple ECSs to share a single public IP address is preferable and more practical. This can be done using SNAT.</p>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_faq_0200.html">SNAT</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_faq_0010.html

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+<a name="nat_faq_0010"></a><a name="nat_faq_0010"></a>
+
+<h1 class="topictitle1">What Is the Quota of the NAT Gateway?</h1>
+<div id="body1549974003887"><div class="section" id="nat_faq_0010__section58274418208"><h4 class="sectiontitle">What Is the Quota?</h4><p id="nat_faq_0010__p754719124214">Quotas are enforced for service resources on the platform to prevent unforeseen spikes in resource usage. Quotas can limit the number or amount of resources available to users. For example, the quota can limit the maximum number of EIPs that can be associated with an SNAT rule. You can apply for increasing quotas if necessary.</p>
+<p id="nat_faq_0010__p16547101282115">This section describes how to view the used NAT Gateway quota and the total NAT Gateway quota in a specified region.</p>
+</div>
+<div class="section" id="nat_faq_0010__section07760615438"><h4 class="sectiontitle">How Do I View My Quotas?</h4><ol id="nat_faq_0010__en-us_topic_0040259342_ol1222775692215"><li id="nat_faq_0010__en-us_topic_0040259342_li5648642910048">Log in to the management console.</li><li id="nat_faq_0010__en-us_topic_0040259342_li464234814566">Click <span><img id="nat_faq_0010__en-us_topic_0040259342_en-us_topic_0014250631_en-us_topic_0014250631_image1733511156361" src="en-us_image_0275513364.png"></span> in the upper left corner and select the desired region and project.</li><li id="nat_faq_0010__en-us_topic_0040259342_li3861581410048">In the upper right corner of the page, click <span><img id="nat_faq_0010__en-us_topic_0040259342_image99377514309" src="en-us_image_0152727234.png"></span>.<p id="nat_faq_0010__en-us_topic_0040259342_p1748884433119">The <strong id="nat_faq_0010__en-us_topic_0040259342_b695801964614">Service Quota</strong> page is displayed.</p>
+</li><li id="nat_faq_0010__en-us_topic_0040259342_li1579070183211">View the used and total quota of each type of resources on the displayed page.<p id="nat_faq_0010__en-us_topic_0040259342_p97891720193417"><a name="nat_faq_0010__en-us_topic_0040259342_li1579070183211"></a><a name="en-us_topic_0040259342_li1579070183211"></a>If a quota cannot meet service requirements, apply for a higher quota.</p>
+</li></ol>
+</div>
+<div class="section" id="nat_faq_0010__section457218466261"><h4 class="sectiontitle">How Do I Apply for a Higher Quota?</h4><p id="nat_faq_0010__en-us_topic_0040259342_p133802054172617">The system does not support online quota adjustment. If you need to adjust a quota, call the hotline or send an email to the customer service mailbox. Customer service personnel will timely process your request for quota adjustment and inform you of the real-time progress by making a call or sending an email.</p>
+<p id="nat_faq_0010__en-us_topic_0040259342_p13745144852611">Before dialing the hotline number or sending an email, make sure that the following information has been obtained:</p>
+<ul id="nat_faq_0010__en-us_topic_0040259342_ul37351029162712"><li id="nat_faq_0010__en-us_topic_0040259342_li12735132932714">Domain name, project name, and project ID, which can be obtained by performing the following operations:<p id="nat_faq_0010__en-us_topic_0040259342_p1973542918275"><a name="nat_faq_0010__en-us_topic_0040259342_li12735132932714"></a><a name="en-us_topic_0040259342_li12735132932714"></a>Log in to the management console using the cloud account, click the username in the upper right corner, select <strong id="nat_faq_0010__en-us_topic_0040259342_b1637292748">My Credentials</strong> from the drop-down list, and obtain the domain name, project name, and project ID on the <strong id="nat_faq_0010__en-us_topic_0040259342_b600826191">My Credentials</strong> page.</p>
+</li><li id="nat_faq_0010__en-us_topic_0040259342_li13735182917270">Quota information, which includes:<ul id="nat_faq_0010__en-us_topic_0040259342_ul6735102912273"><li id="nat_faq_0010__en-us_topic_0040259342_li1073516296277">Service name</li><li id="nat_faq_0010__en-us_topic_0040259342_li6735152972712">Quota type</li><li id="nat_faq_0010__en-us_topic_0040259342_li773592992718">Required quota</li></ul>
+</li></ul>
+<p id="nat_faq_0010__en-us_topic_0040259342_p126761744182712"><a href="https://docs.otc.t-systems.com/en-us/public/learnmore.html" target="_blank" rel="noopener noreferrer">Learn how to obtain the service hotline and email address.</a></p>
+</div>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_faq_0100.html">NAT Gateway</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_faq_0013.html

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+<a name="nat_faq_0013"></a><a name="nat_faq_0013"></a>
+
+<h1 class="topictitle1">What Are the Differences Between Using a NAT Gateway and Using an EIP for an ECS?</h1>
+<div id="body1566956326598"><p id="nat_faq_0013__p919024111146">A NAT gateway provides SNAT and DNAT, so multiple ECSs can share an EIP.</p>
+<p id="nat_faq_0013__p5190174191414">An ECS can also have an EIP bound to it. The EIP does not have to be shared.</p>
+<p id="nat_faq_0013__p280016112012">If both SNAT and EIP are configured for an ECS, data will be forwarded through the EIP.</p>
+<p id="nat_faq_0013__p10403798201">If both DNAT and EIP are configured for an ECS, the ECS will have two EIPs, one that is directly bound to the ECS and one that is associated with the DNAT rule. Incoming data will be forwarded by one of the two EIPs, which is determined by the client user. Outgoing data will be forwarded by the EIP directly bound to the ECS in priority. If the two EIPs are different, data forwarding will fail.</p>
+<p id="nat_faq_0013__p1792725919162">Configuring both a NAT gateway and an EIP for an ECS is not recommended.</p>
+</div>
+<div>
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_faq_0100.html">NAT Gateway</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_faq_0100.html

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+<a name="nat_faq_0100"></a><a name="nat_faq_0100"></a>
+
+
+  <h1 class="topictitle1">NAT Gateway</h1>
+
+  <div id="body1595469556316"><p id="nat_faq_0100__p8060118"></p>
+</div>
+
+<div>
+<ul class="ullinks">
+<li class="ulchildlink"><strong><a href="nat_faq_0003.html">What Is the Relationship Between a VPC, NAT Gateway, EIP Bandwidth, and ECS?</a></strong><br>
+</li>
+<li class="ulchildlink"><strong><a href="nat_faq_0004.html">How Does A NAT Gateway Offer High Availability?</a></strong><br>
+</li>
+<li class="ulchildlink"><strong><a href="nat_faq_0013.html">What Are the Differences Between Using a NAT Gateway and Using an EIP for an ECS?</a></strong><br>
+</li>
+<li class="ulchildlink"><strong><a href="nat_faq_0010.html">What Is the Quota of the NAT Gateway?</a></strong><br>
+</li>
+<li class="ulchildlink"><strong><a href="nat_faq_0005.html">Do the NAT Gateway and SNAT Rule Support the Update Operation?</a></strong><br>
+</li>
+</ul>
+
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_faq_0000.html">FAQs</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_faq_0200.html

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+<a name="nat_faq_0200"></a><a name="nat_faq_0200"></a>
+
+
+  <h1 class="topictitle1">SNAT</h1>
+
+  <div id="body1595469556316"><p id="nat_faq_0200__p8060118"></p>
+</div>
+
+<div>
+<ul class="ullinks">
+<li class="ulchildlink"><strong><a href="nat_faq_001.html">Why Is SNAT Used?</a></strong><br>
+</li>
+<li class="ulchildlink"><strong><a href="nat_faq_0002.html">What Are SNAT Connections?</a></strong><br>
+</li>
+</ul>
+
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_faq_0000.html">FAQs</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_faq_0300.html

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+<a name="nat_faq_0300"></a><a name="nat_faq_0300"></a>
+
+
+  <h1 class="topictitle1">DNAT</h1>
+
+  <div id="body1595469556317"><p id="nat_faq_0300__p8060118"></p>
+</div>
+
+<div>
+<ul class="ullinks">
+<li class="ulchildlink"><strong><a href="nat_faq_0006.html">Why Is DNAT Used?</a></strong><br>
+</li>
+<li class="ulchildlink"><strong><a href="nat_faq_0007.html">Can I Modify DNAT Rules?</a></strong><br>
+</li>
+</ul>
+
+<div class="familylinks">
+<div class="parentlink"><strong>Parent topic:</strong> <a href="nat_faq_0000.html">FAQs</a></div>
+</div>
+</div>
+

docs/natgw/umn/nat_gls_0000.html

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+<a name="nat_gls_0000"></a><a name="nat_gls_0000"></a>
+
+<h1 class="topictitle1">Glossary</h1>
+<div id="body8662426"><p id="nat_gls_0000__en-us_topic_0047892914_p8060118">For details about the terms involved in this document, see <a href="https://docs.otc.t-systems.com/en-us/glossary/index.html" target="_blank" rel="noopener noreferrer">Glossary</a>.</p>
+</div>
+<div></div>
+