Changing network devices looses internet traffic

[Warren Liddell]

Im running FreeBSD 7.1-STABLE an due to my old modem//router being on 
its way out to the graveyard in worakability, i have had to swap over to 
another, but having to use a USB connection instead of my onboard 
network card.  Problem i have is telling my machine to stop looking for 
traffic on re0 an start looking for it on cdce0 .. but i can tseem ot 
find out how to go about that.  All settings are the same in terms of 
gateway IP etc on the newer modem/router as the old one.

What am i missing to let the traffic flow through ?