Hi K.

I've already tried capturing tcpdump.

BIRD's BFD neighbor was captured sending packets, but the packets sent by BIRD were not captured.

In this state, BIRD's BFD packets were captured after restarting BFD protocol.

The BFD packet was captured Only after restarting the BFD protocol .

Is there an issue with BFD Protocol?

Please Check it.

Regards

2020년 7월 17일 (금) 오후 10:57, Kees Meijs | Nefos <kees@nefos.nl>님이 작성:

Hi Seunghwan,

If you're sure no packets were dropped, it might make sense to use
tcpdump(8) or alike to ensure the BFD packets are really there.

Regards,
Kees

On 17-07-2020 04:16, seunghwan hwang wrote:
> Thanks for checking in this issue.
> But, I can't understand.
> If it was because of the iptables, it would have been a problem for
> BGP as well.
> And I'm not using iptables rules, So Any packets weren't dropped.