<p>I am doing the CKAD (Certified Kubernetes Application Developer) 2019 using GCP (Google Cloud Platform) and I am facing timeouts issue when trying to <code>curl</code> the pod from another node. I set a simple Pod with a simple Service.</p>

<p>Looks the firewall is blocking something ip/port/protocol but I cannot find any documentation. </p>

<p>Any ideas?</p>

<p>So after some heavy investigation with <code>tshark</code> and google firewall I was able to unblock myself.</p>

<p>If you add a new firewall rule to GPC allowing <code>ipip</code> protocol for your node networks (in my case 10.128.0.0/9) the <code>curl</code> works !!</p>

<p>sources: <a href="https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml" rel="nofollow noreferrer">https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml</a></p>
