[Mark McLeod]

The very first time I set this up I got burned just by moving too fast, changing my laptop IP every minute or two.
I used the laptop that was to run FMS Light to set all the IPs and so kept changing the laptop IP to 192., then to a particular team, then to 164., then to the FMS Light IP, then back to 192., but the whole setup would only seem to connect piecemeal and sporadically when I was done. A network sniffer running on a separate laptop could see everyone, but the field router wouldn't route the traffic.

It was because the router was remembering one or another of the past laptop IPs and refusing to talk to it when I finally set it back to the FMS Light IP.
It's easier to set the FMS Light laptop IP and leave it, then use a second laptop to chase different IPs as you setup all the components. That's especially important when the teams all show up for the off-season or demo and you're trying to get them all set properly and the field running at the same time.

Firewalls can be bad too, of course.

What "file" are you asking for? I originally made the diagram in Photoshop. Subsequent ones I think I just edited the flatten image in Photoshop. I'll have to go looking for the original to edit the text.