Yes, read the document called "At the event" pointed out in this thread.
https://wpilib.screenstepslive.com/s...g-at-the-event.
Once you switch the roboRIO to static, you have to set everything else to a static IP address as well: driver's station, camera, etc. For example, if you make your roboRio 10.54.28.2, then make the driver's station 10.54.28.5 with a mask of 255.0.0.0. It must have a mask of 255.0.0.0 to connect with the FMS.
You are correct that once you program your radio at the completion, it will no longer deliver any IP addresses. Tethering can work at a competitions if using dynamic IP's because each device will "fall back" to an auto configure address. (169.x.x.x). This didn't always work for us. For one thing, you have to remember to unplug the driver station to cycle the network interface.
For those at competitions with this issue, aren't there control system advisors present? I would think that would get it resolved faster than posting here.