Add section on interal loadbalancer config.

docs/usage/usage.md

@@ -353,6 +353,8 @@ spec:
 
 For more details see [AWS Load Balancer Documentation - Network Load Balancer](https://kubernetes-sigs.github.io/aws-load-balancer-controller/v2.4/guide/service/nlb/)
 
+When using Network Load Balancers (NLB) as internal load balancers, it is crucial to add the annotation `service.beta.kubernetes.io/aws-load-balancer-target-group-attributes: preserve_client_ip.enabled=false`. Without this annotation, if a request is routed by the NLB to the same target instance from which it originated, the client IP and destination IP will be identical. This situation, known as the hairpinning effect, will prevent the request from being processed.
+
 ## `WorkerConfig`
 
 The AWS extension supports encryption for volumes plus support for additional data volumes per machine.