Problem setting default gw in t2/trunk

After building a box with T2/trunk I have configured it with the
correct Gw address but it is not used. When typing route it wait a
while the spit out an incorrect gw.
I have tried to manually set the GW with route add default gw 192.168.1.1
but it fails.
After the box sits for a while and I type route the correct GW address
it there, together with the incorrect one and I still can't leave the
network.

Mikael Ostensson