Hi Maria,

Thanks for your update. I have just run the test in another box running BIRD 2.0.12. I encountered the same issue. The IPv6 prefix is not installed in the kernel if there is more than 1 equal path available. This is what I see in the log:

Feb 17 19:01:05 n002-002 bird[174542]: kernel2: fdaa::/16: installing
Feb 17 19:02:05 n002-002 bird[174542]: kernel2: fdaa::/16: installing
Feb 17 19:03:05 n002-002 bird[174542]: kernel2: fdaa::/16: installing
Feb 17 19:04:05 n002-002 bird[174542]: kernel2: fdaa::/16: installing
Feb 17 19:05:05 n002-002 bird[174542]: kernel2: fdaa::/16: installing
Feb 17 19:06:05 n002-002 bird[174542]: kernel2: fdaa::/16: installing
Feb 17 19:07:05 n002-002 bird[174542]: kernel2: fdaa::/16: installing
Feb 17 19:08:05 n002-002 bird[174542]: kernel2: fdaa::/16: installing
Feb 17 19:09:05 n002-002 bird[174542]: kernel2: fdaa::/16: installing

Do you have the sample working configuration for multipath? Basically I have just configured inside protocol kernel. Thanks.

merge paths on;

Thanks,

Jimmy

On Fri, Feb 14, 2025 at 6:40 PM Maria Matejka <maria.matejka@nic.cz> wrote:

On Fri, Feb 14, 2025 at 05:52:18PM +0800, Jimmy Lim wrote:

I thought the issue might be related to configuration instead of bird version 😕

There is quite some code difference between BIRD 1 and 2, and I do remember that the IPv6 multipath implementation was unstable for some time in the Netlink API.

And that is the reason why we stopped supporting BIRD 1. We ourselves can’t keep track about everything here and there, and even though Santiago has superhuman powers and remembers which part worked how even in 1.3.0 … no, please. We actually do not know how much we have fixed in BIRD 2 and ignored in BIRD 1. There is a lot of development passed by.

Let me try to use another box that run bird 2 for testing as well.

Seriously. Do. Upgrade. Now. We announced the EOL for a reason. Tell your manager that BIRD 1 is EOL. It is not OK to run it in production now. You won’t even get packages for new distros for BIRD 1.

Thank you for your understanding
Maria

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