Xen (not XeServer, btw!) seems to have taken a bak-seat recently, RedHat/CentOS/Fedora concentrating on KVM and Debian silently neglecting it. This is reflected in documentation, there is a lot of outdated stuff around, especially about bridged setups. Same occurs to packages, at least in Debian Wheezy (NB: I also tried on testing, same results with…