[ovs-discuss] OvS 2.5 regression in VXLAN tunnels

[IWAMOTO Toshihiro]

At Thu, 21 Jul 2016 13:06:36 +0200,
Jakub Libosvar wrote:
> 
> On 20/07/16 23:13, pravin shelar wrote:
> > On Fri, Jul 15, 2016 at 6:01 AM, Jakub Libosvar <jlibosva at redhat.com> wrote:
> >> Hi,
> >> 
> >> in OpenStack Neutron project we use Open vSwitch on a single node to
> >> simulate tunneling between multiple nodes. After commit [1] was merged, we
> >> observe openflow output rule being applied on packets, that injects packets
> >> into tunnels but we don't see any packets on the other side of the tunnel.
> >> 
> >> I wrote a simple script to build this environment in order to make it easy
> >> to reproduce [2]. I didn't attach it, I can if requested.
> >> 
> >> Ways to reproduce:
> >>    - fetch the script (e.g. fullstack_env.sh)
> >>    - run as root: fullstack_env.sh setup
> >>    - try ping via tunnel: ip net e nsA ping 10.20.0.10
> >> 
> >> In previous OvS 2.4 were icmp replied.
> >> 
> > Thanks for detailed report.
> > I sent out a fix for master branch. can you try it?
> > 
> > ref: http://openvswitch.org/pipermail/dev/2016-July/075768.html
> > 
> Thanks for sending fix promptly. I tried the patch applied on master
> (compiled kmod and modprobed) but I still can't see packets delivered
> to the peer side of tunnel using [2] script.
> 
> Does [2] work for you?

I tested with linux-4.4 but it didn't work.
"tcpdump -vv -ni lo" shows VXLAN packets are sent but they seem to be
lost somewhere.
To support the use case [2], destination needs to be determined by VNI
and (outer) destination IP address.  The older vxlan_rcv() seems to
use destination addresses in IP headers, but the newer version doesn't
seem to do that.

> Thank you,
> Jakub
> 
> >> Jakub
> >> 
> >> [1]
> >> https://github.com/openvswitch/ovs/commit/e23775f20e1a4c193c22f3fc78fb41ebcd93eeac
> >> [2] http://paste.fedoraproject.org/391442/68587331/
> >> _______________________________________________
> >> discuss mailing list
> >> discuss at openvswitch.org
> >> http://openvswitch.org/mailman/listinfo/discuss
> 
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