Does Azure loadbalancer support proxy protocol?

Kratochvil, Michal 0 Reputation points
2023-05-16T11:32:53.0133333+00:00

Does Azure Load Balancer support proxy protocol as initiator? If yes, can such communication (traffic flow) be processed (offloaded) by the Load Balancer in/to HW?

Azure Load Balancer
Azure Load Balancer
An Azure service that delivers high availability and network performance to applications.
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  1. ChaitanyaNaykodi-MSFT 12,881 Reputation points Microsoft Employee
    2023-05-16T19:53:26.94+00:00

    @Kratochvil, Michal

    Thank you for reaching out on the Microsoft Q&A forum.

    Based on your question above.

    Does Azure Load Balancer support proxy protocol as initiator?

    Azure Load balancer operates on layer 4 and doesn't provide application layer gateway functionality. Protocol handshakes always occur directly between the client and the back-end pool instance.

    A response to an inbound flow is always a response from a virtual machine. When the flow arrives on the virtual machine, the original source IP address is also preserved.

    You can refer to this article for any additional details.

    Now based on your requirements, you can take a look at the Azure Application Gateway which is a web traffic load balancer that enables you to manage traffic to your web applications. Azure Application Gateway appends a x-forwarded-for header which contains the IP:port of the client. You can go through this article for any additional information.

    Application Gateway supports four protocols: HTTP, HTTPS, HTTP/2, and WebSocket.

    Hope this helps! Please let me know if you have any questions, or if I have misunderstood anything.

    ​​Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

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