Hi guys, I have a strange xen problem where the xen server is using the tg3 ethernet driver. The dom0 can ping the guest, but the guest cannot ping the dom0. tcpdump on the dom0 shows that the icmp arrives on its eth0, but it doesnt send the icmp reply. Pinging the default gw in the physical network from the guest works, and the guest has full connectivity to the world, with the exception of the dom0. There are no firewall rules in place. I tried the following to no effect: ethtool -K eth0 tso off ethtool -K eth0 tx off Does anyone have an idea? This is running xen-3.0.3-8.fc6 and kernel-xen-2.6.19-1.2911.6.5.fc6 on guest and dom0. Paul