[ovs-discuss] Ping packets on GRE tunnel are flooded

[Jesse Gross]

On Tue, Dec 17, 2013 at 1:00 AM, Rashmi Rashmi <rashmi.ovs at gmail.com> wrote:
> Hello,
>
>
>
> I am using a GRE tunnel with OVS. Here is the setup detail:
>
>
>
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>
> +--------------+   eth0 (11.0.0.2)  eth1     +----------------+  eth0
> eth0   +----------------+
>
> | M1 (Linux) |-------------------------------------| M2 (Linux)
> |-----------------------------------------------| M3 (Linux) |
>
> +--------------+                                     +----------------+  p0
> (11.0.0.1)      p0 (11.0.0.3) +----------------+
>
>
> gre0  <============> gre0
>
>
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> I am running OVS (1.9.3) on Machines M2 & M3.
>
>
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> For GRE tunnel between M2 & M3 –
>
> On pinging 11.0.0.3 from M1, the pkts coming out of M2.eth0 interface are
> GRE encapsulated. But on machine M3, I see that the single ping-request pkt
> is being looped multiple times.

What are eth0/1 connected to on M2 and M3? It sounds like unknown
unicast is being flooded over those ports.