Openshift pod communication is not working due to ARP failures between a node and its pods.

Solution Verified - Updated -

Issue

  • Network communication with a pod is completely broken or intermittent. Investigation shows the node hosting the pod has a neighbour table with failed ARP entries for the affected pods.

    $ ip neigh show nud failed
    10.128.2.40 dev tun0  FAILED
    10.128.2.20 dev tun0  FAILED
    10.128.2.30 dev tun0  FAILED
    

Environment

  • Red Hat OpenShift Container Platform (OCP) 3.11

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