In the Kubernetes world, every day you hear ipvs vs iptables || pureLB vs metalLB || overlay vs underlay || Nodeport vs Loadbalance and a lot more, and it’s HARD to put all those together from…

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This post explains various networking aspects in Kubernetes, including CNI, LB controller, and Kube-proxy. It also explores how pod-to-pod and container-to-container communication is achieved within and across nodes. Additionally, it discusses the role of IPTABLES/IPVS in handling service IP address routing, and provides an overview of Calico, IPVS, PURELB, IPIP, and ingress controller.

Deciphering the Kubernetes Networking Maze: Navigating Load-Balance, BGP, IPVS and Beyond

1- The relation of CNI, LB controller and Kube-proxy

2-POD to POD / Container to Container — single node (IP addr based)

3- POD to POD / Container to Container — multi node (IP addr based)

4- POD to POD / Container to Container — multi node (Service IP addr based)

Are you ready for the BIG picture? It’s time.