Hi , i did an update today from kernel-xen-2.6.18-1.2869.fc6 to kernel-xen-2.6.19-1.2895.fc6 and from xen-3.0.3-1.fc6 to xen-3.0.3-3.fc6 . the upgrade itself went fine, and all on dom_0 works as expected. But i have now trouble with my guetsts Network. All guests are connecting to the outside world over NAT. i can ssh between all guests as well as between dom_0 and all guests. i can ping each box outside the dom_0 (my dns server for insteance) but i can't ssh or ftp to any box outside my internal dom_0 network, it always timed out. looking at a tcp dump it marks the frames i send from the guests as Checksum Errors. any ideas ? should i open a bugzilla entry for this ? Sven