[fovea1959]

billbo911: I suspect that when you are in the pits or on the practice field at an event with the radio in bridge mode, you won't have any DHCP server, so your laptop and roborio will come up with a 169.254.x.x link local address, your coprocessor will be 10.xx.yy.zz, and your coprocessor won't be able to communicate to the rest of your setup. That's only in the pits or on the practice field.

This was the situation I was worried about, but Joe advised to make sure that everything fell back to using a link local address, and that seems to be ok.

is your coprocessor Linux based? if so, install the avahi utilities, and they will take care mDNS and link local addressing.