Hello there, A couple of weeks ago I~ posted that xen was breaking 'host' and other routing commnds. This is still true. I just tried the 2.6.12-1.1454_FC4xen0 rpm from 'riel'. One suggestion I got was 'strace route', so I tried this. By comparing normal and xen-enabled results, the first change I see is that when "my-gateway" appears on the normal host, the xen enabled xernel finds "my-machine" appearing instead. Somehow it is trying to use itself as a gateway. I do see the following xen eth setup in /var/log/messages Sep 21 12:54:31 heplnw8 kernel: Bridge firewalling registered Sep 21 12:54:32 heplnw8 kernel: device vif0.0 entered promiscuous mode Sep 21 12:54:32 heplnw8 kernel: device peth0 entered promiscuous mode Sep 21 12:54:32 heplnw8 kernel: xen-br0: port 1(vif0.0) entering learning state Sep 21 12:54:32 heplnw8 kernel: xen-br0: topology change detected, propagating Sep 21 12:54:32 heplnw8 kernel: xen-br0: port 1(vif0.0) entering forwarding state Sep 21 12:54:32 heplnw8 kernel: e100: peth0: e100_watchdog: link up, 100Mbps, full-duplex Sep 21 12:54:33 heplnw8 kernel: xen-br0: port 2(peth0) entering learning state Sep 21 12:54:33 heplnw8 kernel: xen-br0: topology change detected, propagating Sep 21 12:54:33 heplnw8 kernel: xen-br0: port 2(peth0) entering forwarding state Can anyone suggest anything? Thanks, Bill