Kubernetes Networking: Operating at Layer 3/4
Kubernetes networking doesn’t care what you send—only where it goes, how, and on which port.
Kubernetes networking is powerful, flexible—and often misunderstood.
One of the most important things to understand is where Kubernetes networking operates in the OSI model. At its core, native Kubernetes networking and NetworkPolicies operate strictly at Layer 3 and Layer 4:
Layer 3 → IP addressing
Layer 4 → Transport protocols and ports (TCP, UDP, SCTP)
T…
