Web Application Firewall:Configure HTTP flood protection rules to defend against HTTP flood attacks

Create an HTTP flood protection rule template

WAF does not provide a default HTTP flood protection rule template. Before you can enable an HTTP flood protection rule, you must create an HTTP flood protection rule template.

1. Log on to the WAF 3.0 console. In the top navigation bar, select the resource group and the region in which the WAF instance is deployed. You can select Chinese Mainland or Outside Chinese Mainland.

2. In the left-side navigation pane, choose Protection Configuration > Protection Rules.

3. In the lower part of the Protection Rules page, click Create Template in the HTTP Flood Protection section.

   Note

   If no HTTP flood protection rule templates exist, you can click Configure Now in the HTTP Flood Protection card in the upper part of the Protection Rules page.

4. In the Create Template - HTTP Flood Protection panel, configure the parameters and click OK. The following table describes the parameters.

   Parameter	Description
   Template Name	Enter a name for the template. The name of the template must be 1 to 255 characters in length and can contain letters, digits, periods (.), underscores (_), and hyphens (-).
   Save as Default Template	Specify whether to set this template as the default template of the protection module. You can set only one default template for a protection module. If you turn on Save as Default Template, you do not need to configure the Apply To parameter. The default template is applied to all protected objects and protected object groups to which no protection templates are applied.
   Action	Specify the action that you want WAF to perform on the request that matches the protection rule. Valid values: Protection: blocks only suspicious requests. In this mode, the false positive rate is low. We recommend that you apply this mode when no abnormal traffic is detected on the website. This helps avoid false positives. Protection-emergency: blocks HTTP flood attacks. In this mode, the false positive rate may be high. If HTTP flood attacks fail to be blocked in Protection mode, the website responds at a low speed, and monitoring metrics such as traffic, CPU, and memory are abnormal, you can select this mode. Note The Protection-emergency mode is suitable for web pages and HTML5 pages. We recommend that you do not select this mode for APIs or native apps. If you select this mode for APIs or native apps, a large number of false positives may occur. We recommend that you create custom rules for APIs or native apps. For more information, see Configure custom rules.
   Apply To	Select the protected objects and protected object groups to which you want to apply the template. You can apply only one template of a protection module to a protected object or a protected object group. For information about how to associate protected objects and protected object groups with the template, see Protected objects and protected object groups.

   By default, a new rule template is enabled. You can perform the following operations in the rule template list:

   • View the number of protected objects and protected object groups that are associated with the template.

   • Turn on or turn off the switch in the Status column to enable or disable the template.

   • Click Edit or Delete in the Actions column to modify or delete the template.

   • Click the icon to the left of a template name to view the rules in the template.

What to do next

On the HTTP Flood Protection tab of the Security Reports page, you can view the protection details of HTTP flood protection rules. For more information, see IP address blacklist, custom rule, scan protection, HTTP flood protection, and region blacklist modules.

References

• Protection configuration overview: describes protected objects, protection modules, and protection process.

• How do I disable HTTP flood protection for a domain name?: describes the following methods that you can use to disable HTTP flood protection for a domain name: configuring whitelist rules and configuring HTTP flood protection rules.

• CreateDefenseTemplate: creates a protection rule template.

• CreateDefenseRule: creates a protection rule. When you call this operation to create an HTTP flood protection rule, you must set the DefenseScene parameter to cc.