Hello K.
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.
* iptables status
============================================================
# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
============================================================
* Port status
============================================================
# netstat -lnp | grep bird
tcp 0 0 0.0.0.0:179 0.0.0.0:* LISTEN
44890/bird
udp 0 0 0.0.0.0:3784 0.0.0.0:*
44890/bird
udp 0 0 0.0.0.0:4784 0.0.0.0:*
44890/bird
unix 2 [ ACC ] STREAM LISTENING 320049 44890/bird
/run/bird/bird.ctl
unix 2 [ ACC ] STREAM LISTENING 398938 44893/bird6
/run/bird/bird6.ctl
============================================================
* BIRD Status
============================================================
# birdc show bfd sessions
BIRD 1.6.8 ready.
bfd1:
IP address Interface State Since Interval
Timeout
10.11.251.4 --- Init 09:37:57 2.000 6.000
10.11.250.4 --- Init 09:37:56 2.000 6.000
# birdc show protocols
BIRD 1.6.8 ready.
name proto table state since info
kernel1 Kernel master up 09:37:52
direct1 Direct master up 09:37:52
device1 Device master up 09:37:52
static1 Static master up 09:37:52
bfd1 BFD master up 09:37:52
as1 BGP master up 09:37:56 Established
as2 BGP master up 09:37:57 Established
============================================================
Is it related to the increase in this value?
============================================================
# netstat -s
...
Udp:
52759 packets received
0 packets to unknown port received
0 packet receive errors
34365164 packets sent
0 receive buffer errors
0 send buffer errors
IgnoredMulti: 3399
...
============================================================
Please check it.
Regards.
2020년 7월 16일 (목) 오후 8:05, Kees Meijs | Nefos <k...@nefos.nl>님이 작성:
> Hi Seunghwan,
>
> It might be your problem isn't BIRD but packet filter related.
>
> Please check the BFD packets are allowed in iptables c.q. netfilter using
> the correct ports and/or addresses.
>
> A possible reason why it starts working after a manual protocol restart is
> a ESTABLISHED, RELATED rule.
>
> References:
>
> - https://tools.ietf.org/html/rfc5881 (Encapsulation, IANA
> Considerations)
> - https://tools.ietf.org/html/rfc5883 (IANA Considerations)
>
>
> K.
>
> On 16-07-2020 11:00, seunghwan hwang wrote:
>
> Hello.
> BFD is Not working normally.
> My configuration is shown below.
>
> OS: Ubuntu 18.04
> Kernel: 4.15.0-54-generic
> BIRD ver: 1.6.8
> ==================================
> protocol bfd {
> multihop {
> min rx interval 300 ms;
> min tx interval 300 ms;
> multiplier 3;
> };
> }
>
> protocol bgp as1 {
> import all;
> export all;
>
> local ~ as ~;
> neighbor ~ as ~;
> enable route refresh off;
> hold time 90;
> bfd on;
> }
>
> protocol bgp as2 {
> import all;
> export all;
>
> local ~ as ~;
> neighbor ~ as ~;
> enable route refresh off;
> hold time 90;
> bfd on;
> }
> ==================================
>
> After system reboot(# shutdown -r now), BGP neighbor is established, But
> BFD sessions are stuck in 'INIT' status. And BIRD does not send BFD packets.
> BFD sessions have recovered after restart protocol bfd1(# birdc restart
> bfd1).
>
> Is it a normal situation?
> I think BFD has to start the mechanism after BGP neighbor is UP.
> Is there any missing part of my configurations?
> Please check it.
>
> Regards
>
>
>
