Hi,
bridged network access is actually quite similar to ICS (two IP addresses hidden behind one interface). Hence you have to enable "Internet Sharing mode" in "Expert Settings" in the Firewall page.
Sorry for that, I didn't stressed this before.
If the virtual box is running, you might need to use "ipconfig /flushdns" to refresh/clean DNS cache. At least with Win2000 it is necessary.
Lukas.
PS: have tested this with Vmware, if anyone can confirm the same (enabling Internet Sharing mode in FW expert settings) work for virutal box as well, it would great.
Thanks.