Get NIC of EKS pod/service

Question

I suppose, node/ec2 can have multiple NICs. POD will connect to one of node's NIC (nay be through it's veth). I am trying to find NIC of a node which particular pod uses to communicate with other pods/internet. I could not get any information of network infrastructure of pod/service using kubectl command or APIs of K8S/AWS. 
Can you please suggest (preferably) APIs or commands which can help me get nic information of service/pod? Or how to find pod to pod path?

Answer

Hello,

In order to find the NIC of a node which particular pod uses to communicate, you can use this command :

First, to get the pod IP :
$ kubectl get pod 
Then, to list the NICs [1]:
$ aws ec2 describe-network-interfaces --filters Name=addresses.private-ip-address,Values= query ‘NetworkInterfaces[*].{ID:NetworkInterfaceId}’

You just need to replace  with the name of your Pod and  with the IP address of your pod.

As for your query regarding finding pod to (pod/service/internet) route, run this troubleshooting pod that contains networking tools such as ‘traceroute’ which enables you to trace pod to pod communication route
$ kubectl run tmp-shell-host --rm -it --image nicolaka/netshoot -- /bin/bash
$ traceroute, tcptraceroute

[1] - https://docs.aws.amazon.com/cli/latest/reference/ec2/describe-network-interfaces.html

Get NIC of EKS pod/service

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