[ovs-discuss] ping loss of first packet with OVN l3 logical router.

[Numan Siddique]

Hi Jai,

This is by design. For any IP packet which goes through the logical router
pipeline, if OVN doesn't know the mac of next hop, it learns it by
generating an ARP request packet replacing the original IP packet. That's
the reason why the first ping is always dropped.

You can run "ovn-sbctl list mac_binding" and see the list of mac learnings.

Thanks
Numan


On Fri, Mar 16, 2018 at 4:17 PM, Jai Singh Rana <jai.rana at gmail.com> wrote:

> Hi All,
>
> I have configured OVN L3 logical router for external traffic with 3
> host native ovs/ovn setup.When pinging from VM to external network for
> the first time after bringing up ovn l3 router , there is ping loss of
> first packet. Afterwards everything works fine even if pinging after
> some interval and no packet loss is observed.
>
> If anyone observed this issue before or has any suggestions to rectify
> this, it will be very helpful. I am using ovs-2.8.90.
>
> Setup topology, configurations and logs are as in following link:
>
> https://pastebin.com/RuTErpw2
>
> -Jai
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>
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