I have a kubernetes cluster having 5 nodes, deployed on aws using kops.

I have a setup a load balancer and ingress-nginx controller for reverse proxy.

So, all incoming request come to a single ip which is of the load balancer.

I have an service admin-srv inside the cluster which forwards request to two pods.

The problem is whenever I make request to some domain example.com from these pods, the source ip assigned is random and picked from any node

So, one time I hit request it is something like 5.1..., again if hit the ip becomes 5.2....

The domain that I am calling example.com they need one ip that would not change and they will whitelist that.

How it can be achieved?