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Troubleshooting networking

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This document describes how to troubleshoot networking errors.

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Connectivity issues on clusters with private Network Load Balancers

Red Hat OpenShift Service on AWS and ROSA with HCP clusters created with version deploy AWS Network Load Balancers (NLB) by default for the default ingress controller. In the case of a private NLB, the NLB’s client IP address preservation might cause connections to be dropped where the source and destination are the same host. See the AWS’s documentation about how to Troubleshoot your Network Load Balancer. This IP address preservation has the implication that any customer workloads cohabitating on the same node with the router pods, may not be able send traffic to the private NLB fronting the ingress controller router.

To mitigate this impact, customer’s should reschedule their workloads onto nodes separate from those where the router pods are scheduled. Alternatively, customers should rely on the internal pod and service networks for accessing other workloads co-located within the same cluster.