[ovs-dev] [ovs-discuss] Checksum incorrect when rewriting icmpv6 packet

Jesse Gross jesse at nicira.com
Fri Aug 15 18:20:27 UTC 2014

On Fri, Aug 15, 2014 at 9:44 AM, Ben Pfaff <blp at nicira.com> wrote:
> [adding Jesse and ovs-dev]
> On Thu, Aug 14, 2014 at 11:03:52AM -0400, Neal Shrader wrote:
>> I came across an issue today what I was attempting to modify the source
>> ipv6 address of a router advertisement generated from a local server.  The
>> flow in question looks like:
>> ovs-ofctl add-flow public
>> 'priority=2040,icmp6,in_port=LOCAL,ipv6_dst=ff02::1,table=1,idle_timeout=0,actions=set_field:fe80::1->ipv6_src,strip_vlan,flood'
>> When I generate an RA, I see that it has an incorrect checksum, and
>> therefore is rejected by the destination host:
> I see that commit af9d14a856268d is on master but not on branch-1.10:

No, I don't think this is the problem. It's just that we don't
implement checksum updates for ICMPv6.

Neil, I sent out a patch. Can you please test it? (It's against
master, realistically we won't do any more releases against 1.10
although it's possible that it will still apply.)

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