If you notice that there is a problem with a member joining a cluster, you may want to perform a connectivity test between the member to be joined and a member already in the cluster. You can use the
iperf tool for this purpose. For example, you can execute the below command on one member (i.e. listening on port 5701).
iperf -s -p 5701
And you can execute the below command on the other member.
-d -p 5701
The output should include connection information, such as the IP addresses, transfer speed, and bandwidth. Otherwise, if the output says
No route to host, it means a network connection problem exists.