Tip: A few commands to triage Kubernetes Network related Issues

tcptraceroute 100.95.96.3 53

nc -vz 147.154.4.38 53TCP port

nc -vz -u 147.154.4.38 53 UDP port

tcpdump -ni ens3 port 31530

for p in $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name); do kubectl logs --namespace=kube-system $p; done