Re: IPv6 prefix is not stored to kernel when multipath is enabled in 1.6.8

[Maria Matejka]

Hello Jimmy,

what is your kernel version? (notable critical points are 4.11 and 5.10)
How do the routes look like? (they may just be unmergeable)

Maria


On 18 February 2025 04:28:19 CET, Jimmy Lim <jhalim10 at gmail.com> wrote:
>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 at 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
>>
>> –
>> Maria Matejka (she/her) | BIRD Team Leader | CZ.NIC, z.s.p.o.
>>

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