bird2 doesn't negotiate with gobgp over ipv6

[Nico Schottelius]

Vladimir,

I love the direction you are going with cilium and bird. We actually had
cilium on our list for potential CNIs, but hold yourself: had to drop
it, because cilium does NOT work on IPv6 only hosts!

I.e. if the k8s workers are IPv6 only, cilium crashes [0].

In case you make any progress in that direction, I'd love to hear from
you.

BR from Switzerland,

Nico

[0] https://redmine.ungleich.ch/projects/open-infrastructure/wiki/The_ungleich_kubernetes_infrastructure#Cilium-CNI-experimental

Vladimir Pouzanov <farcaller at gmail.com> writes:

> On Sun, May 5, 2024 at 7:35 AM Maria Matejka <maria.matejka at nic.cz> wrote:
>
>  The error message actually means "you requested direct connection but i can't see the right interface to use because there is no interface with this
>  range assigned".
>
> Thanks, that was it!
>
> I must have missed the note in the docs on that, because with ipv4 I just had the same subnet, but with ipv6 I don't have a public address assigned on
> the bird side. `multihop 1` Fixed the negotiation issue. I got a few more, but those seem to be related to either gobgp sending malformed updates
> (Invalid NEXT_HOP attribute - mismatched address family (2a01:xx:yy:zz:4746:92e9:327c:d930 for ipv4)), or the bird configuration not being able to
> parse a `-` in the interface name. Both unrelated to this particular issue at hand.
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