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xen-users
Re: [Xen-users] DNAT TCP checksum error
Im not an expert on this either, I have just had to deal with it myself very
recently. A post went out on the devel list earlier
talking about theoretical reasons as to why the tcpchecksum code is disabled
for virtual interfaces. I have posed the question back to
the devel list asking for a clarification as to why that is done and if it
could just be removed since it seems to impact a lot of
people (everyone that isn't bridging as far as I can tell).
As for fixing it in the kernel, you can edit the file drivers/xen/netback/interface.c . look for the line
dev->features = NETIF_F_NO_CSUM;
and replace it with
dev->features = 0; /*NETIF_F_NO_CSUM; */
which as I understand it will re-enable checksums at the virtual interface
level and worked very well for me. If I hear something back on why this code
is set to
disable checksums, I will post it to here.
--
Jason
The place where you made your stand never mattered,
only that you were there... and still on your feet
On Sat, 1 Apr 2006, Javier Guerra wrote:
On Saturday 01 April 2006 1:15 pm, jean-luc.voisin wrote:
the "ethtool -K eth0 tx off" corrects the problem, but how to solve the
problem within the kernel ?
i don't understand fully why this is sometimes needed. does it makes the
driver not to write checksums? or not to rely on hardware checksumming?
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