We're using xen heavily in Fedora's Infrastructure and presently a number of the xen domU hosts are experiencing terrible checksum issues. I've tried the ethtool -K eth0 tx off fix and it didn't work. dom0: 2.6.19-1.2911.fc6xen x86_64 domU: 2.6.20-1.2933.fc6xen x86_64 Anyone have any ideas? -Mike