This gets confusing pretty quickly when an external API or database asks you to whitelist the IP your application is connecting from.
Your pod has an IP, the worker node has another IP, and the cluster may have a public egress IP. But which one does the external service actually see?
This comes up a lot when working with API allowlists, databases, SaaS platforms, or any external service that restricts access by source IP.
I’m curious how other Kubernetes engineers handle this:
<ul>
<li>Do you use a fixed egress IP?</li>
<li>Have you ever had an IP allowlist break after a cluster change?</li>
<li>How do you check the actual public IP your pods are using?</li>
</ul>
I came across a detailed explanation of how Civo Kubernetes handles pod egress traffic, including the SNAT flow, why multiple pods can appear to use a single public IP, and which IP should be used for outbound allowlisting.
<a href="https://www.kubeblogs.com/how-civo-kubernetes-routes-pod-traffic-single-egress-ip-explained/" target="_blank" rel="noopener nofollow">https://www.kubeblogs.com/how-civo-kubernetes-routes-pod-traffic-single-egress-ip-explained/</a>
How are you handling Kubernetes egress and IP allowlisting in your clusters?
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A discussion about how Kubernetes pod egress traffic works and which IP external services actually see when a pod connects out, relevant for API allowlisting and database access restrictions. References a detailed writeup on how Civo Kubernetes routes outbound pod traffic, covering SNAT flow and why multiple pods can share one public egress IP. Poses questions to other Kubernetes engineers about handling fixed egress IPs and diagnosing allowlist breakages after cluster changes.

Which IP does your Kubernetes pod actually use for outbound traffic?

Try giving every cluster an explicit egress IP before the first vendor asks for an allowlist

All private resources connect via NAT gateway and that has en egress IP.
How complicated can it be? why would you give your compute resources public static IPs anyway? Is there a use case for that?