See the Explanation below for step by step instructions
Explanation:
Here are the steps and explanations for creating a policy that can be linked to the planned application gateway and block connections from IP addresses in the 131.107.150.0/24 range:
To create a policy, you need to go to the Azure portal and select Create a resource. Search for WAF, select Web Application Firewall, then select Create1.
On the Create a WAF policy page, Basics tab, enter or select the following information and accept the defaults for the remaining settings:
Policy for: Regional WAF (Application Gateway)
Subscription: Select your subscription name
Resource group: Select your resource group
Policy name: Type a unique name for your WAF policy
On the Custom rules tab, select Add a rule to create a custom rule that blocks connections from IP addresses in the 131.107.150.0/24 range2. Enter or select the following information for the custom rule:
Rule name: Type a unique name for your custom rule
Priority: Type a number that indicates the order of evaluation for this rule Rule type: Select Match rule Match variable: Select RemoteAddr Operator: Select IPMatch Match values: Type 131.107.150.0/24 Action: Select Block On the Review + create tab, review your settings and select Create to create your WAF policy1.
To link your policy to the planned application gateway, you need to go to the Application Gateway service in the Azure portal and select your application gateway3.
On the Web application firewall tab, select your WAF policy from the drop-down list and select Save