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

[Fran]

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