This tag 'NETWORK_INTERFACE' is not in any of the files.condor_config.local has no IP/domainname/machine name anywhere in any of the files. Under what tag would I be looking?
If you look in condor_config, you will see where it references the condor_config.local file. NETWORK_INTERFACE should be the IP address of the resource.
This is interesting and surprising. I get the external IP address of the company. As far as I can tell this is not being set in any Internet config. The one place it is on the gateway, I just removed, but still ping finds it Ping must be doing a full DNS lookup. I'm not much of a network wiz either, so I have no idea how to force this to local only addressing on windows.Also, what is the value of CONDOR_HOST in your config files?"ID5" the name of the machine hosting the master scheduler. Should I change this to the LAN IP of that machine?
If you do "ping ID5", which IP does it find? The LAN one or a different one? If it finds the external one, then maybe changing this may help.
[Caution: I am not a network wiz! ]