Updated March 13, 2023
Introduction to Azure UDR
- Azure UDR (User Defined Routing) or Routing Tables let us design network routes; therefore, our CloudGen Firewall VM can regulate the traffic existing both between the subnets and to the Internet. IP forwarding should be triggered to allow receiving and forwarding traffic for the network interfaces.
- Suppose, when varied route types are existent in a UDR route table, then user-defined routes are chosen above the default type system routes. A further distinct route is implemented when numerous routes equal the destination.
- In an Azure route, the default system routes that constantly exit will permit the succeeding:
- Traffic to the Internet
- Traffic inside the virtual network
- Traffic concerning varied virtual networks by means of the Azure VPN Gateway
- Traffic from the existing virtual network to networks associated through the Azure VPN Gateway
How to configure Azure UDR?
We need to track the succeeding stages to configure Azure UDR in the networking resource group:
- Before starting to design Azure UDR, a Barracuda CloudGen Firewall must be installed.
- Initially, must be logged in to the Azure Portal with the link as: https://portal.azure.com/
- After that, when the user is logged into the portal, then click on New
- After clicking in the New column, you need to select and type the route table manually in the search box and click on Enter to search.
- Now, in the column Everything, choose the option Route Table.
- Then click on
- After that, in the column Route Table, you need to configure the below settings:
- Name: Insert the name of the routing table you wish to create.
- Subscription: You need to choose the Azure Subscription.
- Resource Group: You can either click the option Select existing for using a previously present resource group or insert a distinct resource group name for creating a new resource group.
- Location: Choose the Azure datacenter so that you can deploy the VM where you wish to do. But it must be noted that the routing table should be in the same location as the virtual network and the VMs.
- Then click on
- Now, you can Add Routes for using the firewall VM identified as a gateway by following steps:
- When you open the routing table, go to the column settings and click
- In the column Routes, by clicking on + Add, add a route from the column and configure it, providing the desired name, address prefix, next-hop type, next-hop address, and then click.
- You may create additional routes too.
- Here, you can relate or assign only one Route Table with the respective Subnets as follows:
- Opening the routing table in the same Azure portal, go to the column settings and click
- In the column of subnets, add a subnet by clicking on
- In the column of the Associate subnet, click the option Virtual Network.
- Choose the virtual network option in the column Resource.
- Again in the column Associate subnet, click the option
- In the column Choose subnet, choose the subnet.
- Then click the OK, and you can continue adding other subnets too.
- In this step next, we need to enable IP Forwarding of the Firewall VM for the Network Interfaces having a destination IP address that will not equate its own private IP address.
- In Azure’s portal, opening the Network Interface involved to the firewall VM, from the column click the option.
- Now, clicking the IP addresses in the column of settings enables the IP forwarding option.
- Then click the Save
- Hence, finally, the Barracuda CloudGen Firewall VM is able to forward available traffic from backend VMs now to the Internet.
Create user Azure UDR
Azure routes traffic between Azure subnets, on-premises networks, and virtual networks spontaneously. But on altering any of Azure’s default type routing, we must need to create a routing table. Also, required to set up an Azure account having an active subscription or even for free. You must accomplish one of the below tasks before creating Azure UDR:
- Signing in to the Azure portal by the user using an Azure account.
- Either execute PowerShell from the system or execute the commands in the Azure Cloud Shell.
- Also, it can execute Azure CLI (Command-line interface) from the computer or from Azure Cloud Shell.
Now, follow the succeeding steps below to create an Azure Route Table or UDR by a user in the networking resource group:
- On the Azure portal page, from the menu or Homepage, choose to Create a resource.
- From the search box, type Route table and then select it, which will move you to the respective page, and then you can create a routing table.
- For this, the user needs to enter the name, subscription option, choose resource group, select location, disable Virtual network gateway route propagation if you design to relate the UDR to a subnet in a virtual network and don’t need to circulate on-premises routes to present network interfaces in the subnet.
- At last, choose to Create for creating the user’s defined new route table.
Azure UDR problem
Azure UDR have some limitations or problems, which are mentioned below:
- Numerous network interfaces prevailing are not provisioned for high accessibility clusters.
- Numerous network interfaces prevailing in a single subnet are not provisioned for individual firewall VMs.
- Before anyone starts creating Azure UDR, a Barracuda CloudGen Firewall must be deployed on the system.
Using Azure Firewall
- Azure Firewall service is a smart and cloud-native network firewall safety that offers the superlative of breed threat defense for the cloud workloads executing in Azure.
- It is entirely stateful, the firewall as a service having built-in great accessibility and unlimited cloud scalability delivering both north-south and east-west traffic examination.
- Azure Firewall is available in two kinds of SKUs as Standard & Premium.
- To manage Azure Firewalls around numerous subscriptions, we can apply Azure Firewall Manager for handling centrally, which maintains firewalls in both environments, either VNet or Virtual WANs, i.e., Secure Virtual Hub, to help streamline routing traffic to the firewall.
- For controlling any outbound network accessing from an Azure subnet, we require an Azure firewall that configures Application rules and Network rules.
- In Azure, every subnet can be associated with a UDR table implemented to describe how traffic originated in that subnet existing is routed.
- Azure applies default routes if no UDRs are described to let traffic flow from one subnet to another. Therefore, we need to create UDRs in Azure to confirm better communication via proper firewall appliances.
This is a guide to Azure UDR. Here we discuss the succeeding stages to configure Azure UDR in the networking resource group. You may also have a look at the following articles to learn more-