We hit this problem a while ago and reported it here:
https://bugzilla.redhat.com/show_bug.cgi?id=1906455

On Mon, Feb 20, 2023 at 9:56 AM Plato, Michael via discuss <
[email protected]> wrote:

> Hello,
>
>
>
> we have a problem with ovn in connection with neutron dynamic routing
> (which is now supported with ovn). We can announce our internal networks
> via BGP and the VMs in this network can also be reached directly without
> nat.
>
> But if we attach a public floating ip to the internal self service network
> ip, we have some strange effects. The VM can still be reached via ping with
> both ips. But SSH for example only works via floating ip. I did some
> network traces and found that the return traffic is being natted even
> though no nat was applied on incoming way. From my point of view we need a
> conntrack marker which identifies traffic which was d-natted on incoming
> way and s-nat only those traffic on return way. Is it possible to implement
> something like this to fully support ovn with BGP announced networks which
> are directly reachable via routing?
>
>
>
> Thanks for reply and best regards!
>
>
>
> Michael
> _______________________________________________
> discuss mailing list
> [email protected]
> https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
>


-- 
LUIS TOMÁS BOLÍVAR
Principal Software Engineer
Red Hat
Madrid, Spain
[email protected]
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