We have noticed in one of prod cluster that one of node was trying to communicte or Handshake with other cluster nodes in same AWS Account/Network zone. I'm not sure why it is happening. I have verified the configuration and looks good with respective node IP address. Did anyone experience this behaviour?
DB Version: 4.0.1
Regards, Mani
I would check the seed list configured on both clusters as well as using cqlsh to check system.peers on both clusters.
Normally if a node attempts to communicate with a cluster it is a not a part of, the log will contain a warning. It knows it's not a part of the cluster due to the cluster name not matching.
I've see then in clusters where the seed list on 1 cluster, was using names and the DNS had an incorrect address.