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[Xen-devel] tcp/udp checksum and bridging

  • To: "xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
  • Date: Sun, 6 Jan 2008 21:27:02 +1100
  • Delivery-date: Sun, 06 Jan 2008 02:27:49 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AchQTq1SohWFYBr6T4mFs52Ka7ynkQ==
  • Thread-topic: tcp/udp checksum and bridging

I have a setup with a Linux PV DomU which is on the same bridge as a
Windows DomU using the PV drivers which Andy and I have been developing.

When a tcp packet originates from anywhere but on the same bridge,
everything is fine, but when the packet originates from a machine on the
same bridge, the checksum is wrong.

I think the problem is that the Linux DomU assumes that something else
will do the checksum of the tcp packet, which is mostly correct unless
the packet is only bridged and not routed...

Any suggestions?



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