How traffic is routed to POD by node port

General Discussions
1

-1

I have following question related to traffic routing to POD when i use node port to send traffic to POD.

  1. I send traffic to a node-ip:node-port and no POD is running on that node
  2. I send traffic to a node-ip:node-port and one POD running on that node. will that POD receive the traffic always ?
  3. I send traffic to a node-ip:node-port and more than one POD running on that node. how the traffic distributed between the PODs running on the same node ?

What rules kubernetes follow to route the traffic to POD in the above scenarios ?

2

I have following question related to traffic routing to POD when i use node port to send traffic to POD.

  1. I send traffic to a node-ip:node-port and no POD is running on that node

If the service DOES NOT specify externalTrafficPolicy: Local, then something (iptables, ebpf) on the node will pick a pod on a different node.
If the service DOES specify externalTrafficPolicy: Local, then traffic will be dropped

  1. I send traffic to a node-ip:node-port and one POD running on that node. will that POD receive the traffic always ?

If the service DOES NOT specify externalTrafficPolicy: Local, then something (iptables, ebpf) on the node will pick a pod, maybe on this node, maybe not.
If the service DOES specify externalTrafficPolicy: Local, then traffic will always be routed to a pod on this node

  1. I send traffic to a node-ip:node-port and more than one POD running on that node. how the traffic distributed between the PODs running on the same node ?

If the service DOES NOT specify externalTrafficPolicy: Local, then something (iptables, ebpf) on the node will pick a pod, maybe on this node, maybe not.
If the service DOES specify externalTrafficPolicy: Local, then traffic will always be routed to a pod on this node, randomly

When picking a pod from a set of eligible pods, the algorithm is random (equal-probability).