If you install netxms agent on these machines (and add the address of your netxms server to MasterServer or ControlServers or Servers in agent configuration) then netxms would be able to get information about network interfaces. The other option is if SNMP daemon is running on the machines.
Without that netxms can only see that there is a machine and can ping it to check if it's running. But it can not determine that two addresses belong to same machine.