Traffic Forwarding from one VM to another VM in Azure

$@chin 145

Hello,

I am looking for a solution to forward traffic from a web VM to an app VM. Specifically, when a user tries to access the web VM on port 6545, the traffic should be routed through the web VM to the app VM on port 6767.

Can this be achieved in Azure using services such as Azure Firewall, Application Gateway, Load Balancer, or any other service

Arko Sen 0 Reputation points Microsoft Vendor

2025-02-07T15:56:03.9766667+00:00

Traffic forwarding from you Web VM to an App VM in Azure can be achieved. If your traffic is HTTP(S) then use Application Gateway. If you need port forwarding for non-HTTP(S) protocols, then use Azure Load Balancer or Azure Firewall DNAT.

If you want a lightweight VM-based forwarding, then use iptables on a Linux Web VM.

The Standard Load Balancer can be configured to forward traffic from port 6545 on the Web VM to port 6767 on the App VM.

How?

Create a load balancer and assign it a public IP. Add your Web VM and App VM to the LB's backend pool. Define the Load Balancing rules with frontend port as 6545 and backend port as 6767. Update NSG Rules to allow traffic on ports 6545 (Web VM) and 6767 (App VM).
Ganesh Patapati 3,530 Reputation points Microsoft Vendor

2025-02-10T15:34:26.9733333+00:00

Hello $@chin

Good day!

Just checking in to see if you had a chance to review response provided by Arko Sen to your question about resolving the issue.
Ganesh Patapati 3,530 Reputation points Microsoft Vendor

2025-02-11T10:47:43.96+00:00

Hello $@chin

Good day!

Just checking in to see if you had a chance to review response provided by Arko Sen to your question about resolving the issue.

1 answer

chrischin 90 Reputation points Microsoft Employee

2025-02-11T19:05:43.45+00:00

You can do this in a number of ways but some of the options depend on if the traffic is web (http/https) or not web. For non-web you can use layer 4 options like load balancer and Azure Firewall (create a DNAT rule). For web traffic, you can use L4 - L7 such as load balancer, Azure Firewall but also App Gtwy and even your build your own reverse proxy (https://learn.microsoft.com/en-us/iis/extensions/planning-for-arr/using-the-application-request-routing-module).
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Traffic Forwarding from one VM to another VM in Azure

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