Does Azure LB honor the subnet routes? If not, how can we force Azure LB to take a route to reach its backend pool server

Shikha 6

I have 2 backend servers configured behing Azure LB, but I want the health check and the data traffic to go via some other Virtual machine, so how it is possible to make azure lb take that route

GitaraniSharma-MSFT 49,466 Reputation points Microsoft Employee

2020-10-21T13:14:11.263+00:00

Hello @Shikha ,

Could you please clarify the below questions?

1) Is it a Standard or Basic SKU Load balancer?
2) Is it an Internal or External Load balancer?
3) The virtual machine through which you want your data to go through, is it a NVA?

Thanks,
Gita
Shikha 6 Reputation points

2020-10-21T13:59:25.477+00:00
Hi Gita,

It is a basic Load balancer

It is an internal load balancer

Yes, it is a virtual machine..simple linux machine through which I want to route my Load balancer traffic

So my Azure LB should forward the requents to the backend pool server via that linux machine.
Shikha 6 Reputation points

2020-10-21T14:00:15.453+00:00

Hi Gita,

It is a basic Load balancer

It is an internal load balancer

Yes, it is a virtual machine..simple linux machine through which I want to route my Load balancer traffic

So my Azure LB should forward the requents to the backend pool server via that linux machine.
GitaraniSharma-MSFT 49,466 Reputation points Microsoft Employee

2020-11-03T10:03:54.28+00:00

Hello @Shikha ,

Just checking in to see if the below answer helped. If this answers your query, please don’t forget to click "Accept the answer" and Up-Vote for the same, which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.

Thanks,
Gita
GitaraniSharma-MSFT 49,466 Reputation points Microsoft Employee

2020-11-06T12:04:27.323+00:00

Hello @Shikha ,

Could you please provide an update on this post?

Kindly let us know if the below answer helps or you need further assistance on this issue.

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1 answer

GitaraniSharma-MSFT 49,466 Reputation points Microsoft Employee

2020-10-28T11:44:27.027+00:00
Hello @Shikha ,

You would need to configure the Linux machines or NVA in the backend pool of the Load balancer and make sure that IP forwarding is enabled in the Linux machines/NVA to forward the requests to the backend servers.

IP forwarding enables the virtual machine a network interface is attached to:

Receive network traffic not destined for one of the IP addresses assigned to any of the IP configurations assigned to the network interface.

Send network traffic with a different source IP address than the one assigned to one of a network interface's IP configurations.

Please refer : https://learn.microsoft.com/en-us/azure/virtual-network/virtual-network-network-interface#enable-or-disable-ip-forwarding

Kindly let us know if the above helps or you need further assistance on this issue.

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Does Azure LB honor the subnet routes? If not, how can we force Azure LB to take a route to reach its backend pool server

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