I generally install UT in bridge mode with two NIC's behind an ADSL firewall router and in front of a switch that contains all my clients and an SBS server (with one NIC).
I normally have the DNS on each client pointing to the SBS as is required and then the DNS Forwarder on the SBS server pointing to either the router's LAN IP or Open DNS (188.8.131.52). Without UT in harms way this works fine.
When I put UT in the way with a default Open Source install, all internet browsing fails unless I change the DNS forwarder on the SBS to the IP address of the UT. When this happens I can still ping the internet by IP. DNS is turned off at all times on UT as is DHCP. Surely in bridge mode UT should let outgoing DNS through and I should not have to resort to putting the UT as the DNS forward just to get web access? No other firewall or non rack policies are set other than the default.