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 checkingĀ 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.