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 selectCreate a resource.Search forWAF, selectWeb Application Firewall, then selectCreate1.
On theCreate a WAF policypage,Basicstab, 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 theCustom rulestab, selectAdd a ruleto 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 theReview + createtab, review your settings and selectCreateto create your WAF policy1.
To link your policy to the planned application gateway, you need to go to theApplication Gatewayservice in the Azure portal and select your application gateway3.
On theWeb application firewalltab, select your WAF policy from the drop-down list and selectSave
