bird2 doesn't negotiate with gobgp over ipv6

[Vladimir Pouzanov]

As far as I know, the recent cilium releases are capable of running ipv6
only (although I didn't try it personally, yet). BGP-wise, the only change
you should need to make is to specify the router id:
https://docs.cilium.io/en/latest/network/bgp-control-plane/#specifying-router-id-ipv6-single-stack-only
.

As for my case, I figured out the basic configuration that makes cilium
push both ipv4 and ipv6 routes and it's actually working as intended.
Here's a post with my notes
https://farcaller.net/2024/making-cilium-bgp-work-with-ipv6/, but really,
all the struggles I had were to do with my misunderstanding how exactly
bird operates.

On Mon, May 6, 2024 at 8:43 AM Nico Schottelius <
nico.schottelius at ungleich.ch> wrote:

>
> 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.
>
> --
> Sustainable and modern Infrastructures by ungleich.ch
>


-- 
Sincerely,
Vladimir "Farcaller" Pouzanov
http://farcaller.net/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://trubka.network.cz/pipermail/bird-users/attachments/20240506/8f1a1c19/attachment.htm>