In that case uniserver was right. manually give it an ip address, subnet mask and your routers dns settings (or google dns 8.8.8.8 and 8.8.4.4)

(the brige can be configured wia web browser on another machine first, power down and plug into mac. then set the settings on mac in control panel, TCP/IP iirc)

I have a ethernet to wireless bridge as well and it was how I originally connected my SE and G3 to the router.