Configure Network Routing

In simple terms, routing is how the internet or a network decides where data packets should go and which route they should take to reach their destination.

Scenario:

To ensure the firewall policies are enforced, outbound application traffic must be routed through the firewall. You identify these requirements.

. A route table is required. This route table will be associated with the frontend and backend subnets.

. A route is required to filter all outbound IP traffic from the subnets to the firewall. The firewall’s private IP address will be used.

Skilling tasks:

. Create and configure a route table.

. Link a route table to a subnet.

Architecture diagram:

Note: Azure automatically creates a route table for each subnet within an Azure virtual network. The route table includes the default system routes. You can create route tables and routes to override Azure’s default system routes.

No 1. Create a route table.

a. Record the private IP address of app-vnet-firewall.

i. In the search box at the top of the portal, enter Firewall. Select Firewall in the search results.

ii. Select app-vnet-firewall.

iii. Select Overview and record the Private IP address.

No 2. Add the route table.

i. In the search box, enter Route tables. When Route table appears in the search results, select it.

ii. In the Route table page, select + Create and create the route table.

iii. Select Review + create and then select Create.

iv. Wait for the route table to deploy, then select Go to resource.

No 3. Associate the route table to the subnets.

i. In the portal, continue working with the route table, select app-vnet-firewall-rt.

ii. In the Settings blade, select Subnets and then + Associate.

iii. Configure an association to the frontend subnet, then select OK.

iv. Configure an association to the backend subnet, then select OK.

No 4. Create a route in the route table.

i. In the portal, continue working with the route table, select app-vnet-firewall-rt.

ii. In the Settings blade, select Routes and then + Add.

iii. Configure the route, then select Add.