IPIP CrossSubnet Mode

IPIP CrossSubnet Mode An architecture diagram generated by Archify. Node 1 · 10.0.1.10 · Subnet 10.0.1.0/24 Node 1 10.0.1.10 Node 2 · 10.0.1.11 · Subnet 10.0.1.0/24 Node 2 10.0.1.11 Node 3 · 10.0.2.10 · Subnet 10.0.2.0/24 Node 3 10.0.2.10 Node 4 · 10.0.2.11 · Subnet 10.0.2.0/24 Node 4 10.0.2.11 Direct routing, no encapsulation Direct routing, no encapsulation IPIP encapsulation (cross-subnet) IPIP encapsulation (cross-subnet) Subnet 10.0.1.0/24 Subnet 10.0.2.0/24 Legend Backend

Same subnet

  • • Node 1 <-> Node 2 and Node 3 <-> Node 4 route pod traffic directly
  • • No tunnel header, full 1500-byte MTU

Cross-subnet

  • • Only hops between 10.0.1.0/24 and 10.0.2.0/24 are IPIP-encapsulated
  • • 20-byte overhead applies to that hop only (effective MTU 1480)

IPPool setting

  • • ipipMode: CrossSubnet
  • • Optimization for hybrid environments spanning L3 boundaries