On an XP machine, I have an active ethernet and wireless connection. The computer gets its internet connection from the wireless. When I bridge the two connections I cannot ping or nslookup anything at all including private and public IP addresses. I checked the bridge config and it has an IP correctly assigned by my DHCP server with all correct gateway and DNS settings.

Why would all wireless functionality break just by bridging the connections?

I can give my whole network topology if necessary, but I wondered if this were something simple I've overlooked.

edit: no firewall involved.