Re: [libvirt] --checksum-fill error on Ubuntu 10.04

caused by network filter driver depends on the newer iptables, there is no "--checksum-fill" option indeed in older iptables. The following commit log is from iptables git. commit 9d1b11102b53103c00b7fddf4658a4d2bdee1338 Author: Michael S. Tsirkin <mst(a)redhat.com&gt; Date: Thu Jul 15 17:23:24 2010 +0200 extensions: libxt_CHECKSUM extension This adds a `CHECKSUM' target, which can be used in the iptables mangle table. You can use this target to compute and fill in the checksum in a packet that lacks a checksum. This is particularly useful, if you need to work around old applications such as dhcp clients, that do not work well with checksum offloads, but don't want to disable checksum offload in your device. The problem happens in the field with virtualized applications. For reference, see Red Hat bz 605555, as well as http://www.spinics.net/lists/kvm/msg37660.html Typical expected use (helps old dhclient binary running in a VM): iptables -A POSTROUTING -t mangle -p udp --dport bootpc \ -j CHECKSUM --checksum-fill Includes fixes by Jan Engelhardt <jengelh(a)medozas.de&gt; Signed-off-by: Michael S. Tsirkin <mst(a)redhat.com&gt; Signed-off-by: Patrick McHardy <kaber(a)trash.net&gt; Even on my FC13, it's without "CHECKSUM" support, the build date is 'Thu 08 Apr 2010 06:30:45 PM CST', :-) Could we treat the error message as warnings? or make it only works for newer iptables? - Osier ----- "Justin Clift" <jclift(a)redhat.com&gt; wrote: