Pod-to-Pod Communication Across Nodes

Pod-to-Pod Communication Across Nodes An architecture diagram generated by Archify. Pod 1 · 10.244.1.2 · Node A Pod 1 10.244.1.2 Pod 2 · 10.244.1.3 · Node A Pod 2 10.244.1.3 CNI network · overlay / routing · Architecture component CNI network overlay / routing Pod 3 · 10.244.2.2 · Node B Pod 3 10.244.2.2 Pod 4 · 10.244.2.3 · Node B Pod 4 10.244.2.3 Direct, no NAT same mechanism Node A Node B Legend Frontend Message bus

Kubernetes network model

  • • Every pod gets its own IP
  • • Pods must reach each other without NAT

Role of the CNI plugin

  • • Builds inter-node paths via overlay (VXLAN) or routing (BGP)
  • • e.g. VPC CNI, Cilium, Calico