Elastic Load Balancer to provide source IP address when not defined as HTTP LB.

Question

Hello,

Is there any way to configure an AWS-ELB to provide source IP address when it is not configured as an HTTP load balancer but TCP load balancer?

To explain a bit, we would like to to setup SMTP servers on EC2-Instances behind a the ELB, but we need to be sure the receive the right origin IP address within the SMTP protocol which now implements X-Forward-For as HTTP protocol.

Any advice would be appreciated.

Answer

Yes, I think what you want is a Network Load Balancer. See: [Client IP preservation](https://docs.aws.amazon.com/elasticloadbalancing/latest/network/load-balancer-target-groups.html#client-ip-preservation).

Elastic Load Balancer to provide source IP address when not defined as HTTP LB.

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