Need help with connecting ethernet bridge

I have an AE basestation-based wireless network in my home and am connecting a USRobotics 802.11g ethernet gaming bridge so I can network my RePlayTV via cable to the bridge.

I'm required to enter the network numerical info manually and am stuck on what to enter for gateway and for DNS servers #1 and #2. I've searched the info through airport admin utility, but the DNS area is blank and I don't see anything for gateway. Is the router address (not the IP address) the gateway??

I've got all the other info needed, but gateway # and DNS servers (2) #'s. Where do I find them? Thanks for the help!