"<ERR> bfd1: Socket error: Destination address required"

[Bernd Naumann]

Are your neighbors directly connected or by any chance multihop?

On 29.04.24 7:41 PM, Fran via Bird-users wrote:
> Hello Alexander,
> 
> thanks for your email.
> 
> I started without any neighbor config in the BFD section and the error
> message was there, while trying to get rid of the error I first added
> the "local <IP address>"  and then the "dev <interface>" options. The
> error message appears non the less.
> 
> Best,
> 
> fran
> 
> 
> 
> On 29/04/2024 17:20, Alexander Zubkov wrote:
>> Hi,
>>
>> You do not need to define neighbors for BGP sessions explicitly in
>> your BFD config. They are created automatically for BGP sessions with
>> BFD enabled. In that case, I suppose, you won't get errors for the
>> missing neighbors.
>>
>> Regards,
>> Alexander
>>
>> On Mon, Apr 29, 2024 at 1:16 PM Fran via Bird-users
>> <bird-users at network.cz> wrote:
>>>
>>> Hello there,
>>>
>>> I get the error message:
>>>
>>> "<ERR> bfd1: Socket error: Destination address required"
>>>
>>> (ubuntu 22.04, bird via ppa 2.15.1) running BFD and MP-BGP via IPv6 over
>>> wireguard interfaces. Not all BGP neighbors are reachable.
>>>
>>> Relevant (I hope) config:
>>>
>>> log "/var/log/bird/bird.log" all;
>>>
>>> protocol device {
>>> }
>>>
>>> protocol bfd {
>>>     accept ipv6 direct;
>>>     interface "wg_blue*";
>>>     interface "wg_green" {
>>>       multiplier 3;
>>>       interval 500 ms;
>>>     };
>>>     neighbor 2001:db8:f000::2 dev "wg_green" local 2001:db8:f000::1;
>>>     neighbor 2001:db8:f000:ffff::2 dev "wg_blue2" local
>>> 2001:db8:f000:ffff::1;
>>>     neighbor 2001:db8:f000:fffc::5 dev "wg_blue1" local
>>> 2001:db8:f000:fffc::1;
>>>     neighbor 2001:db8:f000:fffc::4 dev "wg_blue1" local
>>> 2001:db8:f000:fffc::1;
>>>     neighbor 2001:db8:f000:fffc::3 dev "wg_blue1" local
>>> 2001:db8:f000:fffc::1;
>>>     neighbor 2001:db8:f000:fffc::2 dev "wg_blue1" local
>>> 2001:db8:f000:fffc::1;
>>> }
>>>
>>>
>>> protocol bgp EXAMPLE {
>>>     local as 65001;
>>>     neighbor 2001:db8:f000::2 as 65044;
>>>     direct;
>>>     med metric yes;
>>>     ipv4 {
>>>       ...
>>>     };
>>>     ipv6 {
>>>       ...
>>>     };
>>>     bfd on;
>>> }
>>>
>>>
>>> If I remove the BFD config for the non-established BGP neighbors, the
>>> error message disappears (although there are still non-established BFD
>>> sessions for established BGP neighbors (BFD not yet confed on the other
>>> end)).
>>>
>>> At first I did not create neighbor statements for BFD, then I added
>>> "dev" and "local" options - no improvement.
>>>
>>> No revelations with "debug protocols all".
>>>
>>> Any ideas? Thanks a lot!
>>>
>>> Best,
>>>
>>> fran

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