[Xen-bugs] [Bug 447] New: dom0 netfilter DNAT rule that rewrites the destination port doesn't work with domU TX checksum offload

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=447

           Summary: dom0 netfilter DNAT rule that rewrites the destination
                    port doesn't work with domU TX checksum offload
           Product: Xen
           Version: 3.0-testing
          Platform: x86-64
        OS/Version: Linux-2.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Unspecified
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: mgoodman@xxxxxxxxxxxxxxxxx


A rule like this in dom0:

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to-destination
$DOMU_IP:7800

doesn't work unless in the domU, I run:

ethtool -K eth0 tx off

If the DNAT rule preserves the destination port, it works.

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