The player gets an IP address from a DHCP server, then I unplug the network cable and let it sit for a while. It will try to send a renewal request, but since the cable is unplugged, it fails to do so. Details on the serial output are in the attachment. Is this neighbour table overflow error bad?

Well, the neighbor table overflow seems to be linked to the loopback adapter starting after the regular eth0 adapter. I get around it (and avoid the error) by doing the following:

# ifconfig eth0 down
# ifconfig eth0 up

There are probably easier ways to do this (put it in init, profile, etc.), but I am lazy and in the habit of typing text commands. This should eliminate the neighbor table overflow errors.