Kubernetes Networking
Pod Networking Across Nodes
The pod on node A needs to reach a pod on node B. The underlying network has never heard of pod addresses. Two broad approaches solve this, and the choice constrains everything downstream.
What this lesson covers
- Overlay encapsulation: works on any underlying network, costs MTU and CPU
- Native routing: faster and cheaper per packet, requires the network to know pod CIDRs
- When each approach is actually available to you, and what it demands of your infrastructure
- How the choice constrains later decisions about MTU, observability, and multi-cluster
What is actually happening
Coming soon.
The Kubernetes model versus the CNI's choice
Coming soon.
How it works in practice
Coming soon.
Common failure modes
Coming soon.
What people get wrong
Coming soon.
INTERVIEW QUESTION
Compare overlay encapsulation and native routing for pod to pod traffic across nodes. What does each cost, and what does native routing require of the underlying network?
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