BFD sessions with FFR (VyOS) won't establish

[Alexander Zubkov]

Hi,

There were reports here in the list that some BFD peers do not allow
connections from non-standard ports and bird do not choose source port
specifically. So you might need to tune your sysctl like that:

net.ipv4.ip_local_port_range = 49152 65535

Not sure if this is the case, but I would try that first.

Regards,
Alexander

On Tue, Jan 16, 2024 at 9:15 AM Lukas Haase via Bird-users
<bird-users at network.cz> wrote:
>
> Hello,
>
> My BFD session between bird work fine but the ones but the ones to VyOS (which uses FFR) just won't connect:
>
> # birdc show bfd sess
> BIRD 2.0.8 ready.
> bfd1:
> IP address Interface State Since Interval Timeout
> 172.20.215.131 --- Init 10:39:14.183 1.000 10.000
> 172.20.215.130 --- Up 10:42:03.901 0.100 0.500
>
> 172.20.215.131 is here a VyOS box and its FFR config looks like:
>
> !
> bfd
> peer 172.20.215.129 multihop local-address 172.20.215.131
> detect-multiplier 10
> transmit-interval 100
> receive-interval 100
> exit
> !
> exit
> !
> end
>
>
> For reference, my bird config is trivially:
>
> protocol bfd
> {
> interface "local-ibgp" {
> min rx interval 100 ms;
> min tx interval 100 ms;
> idle tx interval 500 ms;
> multiplier 10;
> };
> neighbor 172.20.215.130 local 172.20.215.129 multihop;
> neighbor 172.20.215.131 local 172.20.215.129 multihop;
> }
>
>
> I have turned off firewall. What else could go wrong?
>
>
> Thanks,
> Luke