Strict Bind usability

[Maria Matejka]

Hello Sebastian,

>> Issue: 46, 340

On Sun, Jan 04, 2026 at 02:04:04PM +0100, Sebastian Hahn wrote:

> just wanted to ask if there's any progress here. Added Maria because I've
> seen you a lot on the mailing list. Many thanks!

Well there is _some_ progress, yet probably not complete, see below.

On Sun, Jan 14, 2024 at 10:50:18PM +0100, Sebastian Hahn wrote:
 
> I've been using strict bind for bgp, but there might be a lack in my understanding or I have a proposal for a new feature. Strict bind seems to be a bit more restrictive than I'd like (and than I think it is necessary):
> 
> I would like to use dynamic bgp (using a range for neighbour) with
> auto-configured LL IPv6 adresses. This doesn't work, of course, if I
> need to statically configure the source address, which I am forced to
> with the strict bind option. [...]

With BIRD 2.18, you should be able (and I may be wrong because
I implemented it half a year ago) to have `strict bind` with dynamic
link-local and `interface` set.  I have no idea whether your needs would
be met completely with this version but if you could check please …

> I am wondering, is this restriction
> really needed? There is only one IP address (the LL one) on the
> interface in question (and the interface is specified in config).
> I think this should mean that bird could just pick that IP address and
> use it for both source as well as to bind to. If that is true, could a
> "source address auto" option or so be added to allow such a
> configuration?

If it's ok that it would choose the source address kinda randomly from
that interface, it's probably a feature worth adding. And because we did
some BGP listening reworks, it should actually be trivial now, while for
2.17 and older it wasn't.

> In addition, it would be great if a strict bind option could be added
> for the babel protocol.

Noted finally, sorry for missing that.

Thanks for the heads-up, have a good new year!  
Maria

-- 
Maria Matejka (she/her) | BIRD Team Leader | CZ.NIC, z.s.p.o.
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