Preserve source IP address

[Todor Petkov]

Hello,

I have the following setup: 3 worker nodes, running metallb, and service exposed via LoadBalancerIP. When I run 'curl $LoadBalancerIP', in the pod itself I see the source IP as the gateway of the pod. I tried to change externalTrafficPolicy to Local, but it's still being NATed. Is there a way to preserve the original source IP address? I read https://kubernetes.io/docs/tasks/access-application-cluster/create-external-load-balancer/#preserving-the-client-source-ip but nothing helps.

Thanks,

[David Anderson]

If you set externalTrafficPolicy: Local, MetalLB itself is doing the
work to make original source IPs work. However, the component that
actually changes or preserves the source IP is not MetalLB, it's
kube-proxy combined with whatever network addon you use. If you set
externalTrafficPolicy=Local and your traffic is still being NATed,
it's a bug in either upstream Kubernetes (kube-proxy), or in your
network addon.

- Dave

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