:original_name: vpc_acl_0005.html

.. _vpc_acl_0005:

Modifying a Firewall Rule
=========================

Scenarios
---------

Modify an inbound or outbound firewall rule based on your network security requirements.

Procedure
---------

#. Log in to the management console.

2. Click |image1| in the upper left corner and select the desired region and project.

3. Click |image2| in the upper left corner and choose **Network** > **Virtual Private Cloud**.

4. In the navigation pane on the left, choose **Access Control** > **Firewalls**.

5. Locate the target firewall and click its name to switch to the page showing details of that particular firewall.

6. On the **Inbound Rules** or **Outbound Rules** tab, locate the row that contains the target rule and click **Modify** in the **Operation** column. In the displayed dialog box, configure parameters as prompted. :ref:`Table 1 <vpc_acl_0005__table59686157164549>` lists the parameters to be configured.


   .. figure:: /_static/images/en-us_image_0285048674.png
      :alt: **Figure 1** Modify Rule

      **Figure 1** Modify Rule

   .. _vpc_acl_0005__table59686157164549:

   .. table:: **Table 1** Parameter descriptions

      +------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------+
      | Parameter              | Description                                                                                                                                                                                                                                                    | Example Value         |
      +========================+================================================================================================================================================================================================================================================================+=======================+
      | Priority               | Priority of firewall rule. A smaller priority value represents a higher priority. Each network ACL includes a default rule whose priority value is an asterisk (``*``). Default rules have the lowest priority.                                                | 3                     |
      +------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------+
      | Status                 | Status of a firewall. When you add a rule to it, its default status is **Enabled**.                                                                                                                                                                            | Enabled               |
      +------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------+
      | Action                 | The action in the firewall. This parameter is mandatory. You can select a value from the drop-down list. Currently, the value can be **Allow** or **Deny**.                                                                                                    | Allow                 |
      +------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------+
      | Protocol               | The protocol supported by the firewall. This parameter is mandatory. You can select a value from the drop-down list. The value can be **TCP**, **UDP**, **All**, or **ICMP**. If **ICMP** or **All** is selected, you do not need to specify port information. | TCP                   |
      +------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------+
      | Source                 | The source from which the traffic is allowed. The source can be an IP address or IP address range.                                                                                                                                                             | 0.0.0.0/0             |
      |                        |                                                                                                                                                                                                                                                                |                       |
      |                        | -  IP address:                                                                                                                                                                                                                                                 |                       |
      |                        |                                                                                                                                                                                                                                                                |                       |
      |                        |    -  Single IP address: 192.168.10.10/32                                                                                                                                                                                                                      |                       |
      |                        |    -  All IP addresses: 0.0.0.0/0                                                                                                                                                                                                                              |                       |
      |                        |    -  IP address range: 192.168.1.0/24                                                                                                                                                                                                                         |                       |
      |                        |                                                                                                                                                                                                                                                                |                       |
      |                        | -  Security group: sg-A                                                                                                                                                                                                                                        |                       |
      +------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------+
      | Source Port Range      | The source port number or port number range. The value ranges from 1 to 65535. For a port number range, enter two port numbers connected by a hyphen (-). For example, **1-100**.                                                                              | 22, or 22-30          |
      |                        |                                                                                                                                                                                                                                                                |                       |
      |                        | You must specify this parameter if **TCP** or **UDP** is selected for **Protocol**.                                                                                                                                                                            |                       |
      +------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------+
      | Destination            | The destination to which the traffic is allowed. The destination can be an IP address or IP address range.                                                                                                                                                     | 0.0.0.0/0             |
      |                        |                                                                                                                                                                                                                                                                |                       |
      |                        | -  IP address:                                                                                                                                                                                                                                                 |                       |
      |                        |                                                                                                                                                                                                                                                                |                       |
      |                        |    -  Single IP address: 192.168.10.10/32                                                                                                                                                                                                                      |                       |
      |                        |    -  All IP addresses: 0.0.0.0/0                                                                                                                                                                                                                              |                       |
      |                        |    -  IP address range: 192.168.1.0/24                                                                                                                                                                                                                         |                       |
      |                        |                                                                                                                                                                                                                                                                |                       |
      |                        | -  Security group: sg-A                                                                                                                                                                                                                                        |                       |
      +------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------+
      | Destination Port Range | The destination port number or port number range. The value ranges from 1 to 65535. For a port number range, enter two port numbers connected by a hyphen (-). For example, **1-100**.                                                                         | 22, or 22-30          |
      |                        |                                                                                                                                                                                                                                                                |                       |
      |                        | You must specify this parameter if **TCP** or **UDP** is selected for **Protocol**.                                                                                                                                                                            |                       |
      +------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------+
      | Description            | Supplementary information about the firewall rule. This parameter is optional.                                                                                                                                                                                 | N/A                   |
      |                        |                                                                                                                                                                                                                                                                |                       |
      |                        | The description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).                                                                                                                                                            |                       |
      +------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------+

7. Click **Confirm**.

.. |image1| image:: /_static/images/en-us_image_0141273034.png
.. |image2| image:: /_static/images/en-us_image_0000001500905066.png