[x-post to vbox forums]
Virtualbox: Ubuntu 12.04 host, WinXP SP3 guest.
The recent change in DNS handling in Ubuntu 12.04 is described here. It means that a NAT'ed WinXP host will receive a 127.0.0.1 DNS server IP, which prevents DNS from working out-of-the-box in the guest.
A workaround is to set the DNS Server(s) manually in the guest every time.
What is the recommended virtualbox setup for hosts running resolvconf (assuming the host does not have a static IP) to make DNS work seamlessly in the guest?