Netmask is not correct
From Greg Brown -
To start off with.
From my studies I suspect that the following nodes are using a 16 bit netmask when it should be a 24 bit netmask.
They send directly to cns71pc(18.104.22.168) or cns73pc(22.214.171.124) across IP subnet boundaries using a 16 bit netmask.
The cnsxxpcs (using a 24 bit netmask) then reply to the router (using a 24 bit netmask) which then sends the packet onto the llrf-pip2it-socfpga-xxxx nodes.
This netmask should be fixed in order to continue troubleshooting.
Nodes prbopr and llrf-pip2it-socfpga-003 appear to be using the correct 24 bit netmask and are fine.