Bird 2.14 Starts but Won't Bind to Port 179
Maria Matejka
maria.matejka at nic.cz
Thu Aug 1 22:22:46 CEST 2024
It looks like working. It accepts the default route while refusing to export it back which is expected to happen.
Maria
On 1 August 2024 21:48:36 CEST, Eric Robinson <eric.robinson at psmnv.com> wrote:
>I added that and it listens now!
>
>I’m not sure what to make of the log notices, though.
>
>2024-08-01 12:43:15.036 <TRACE> isp2: Started
>2024-08-01 12:43:15.036 <TRACE> isp2: Connect delayed by 5 seconds
>2024-08-01 12:43:15.036 <TRACE> isp1: Started
>2024-08-01 12:43:15.036 <TRACE> isp1: Connect delayed by 5 seconds
>2024-08-01 12:43:19.073 <TRACE> isp1: Connecting to <redacted> from local address <redacted>
>2024-08-01 12:43:19.074 <TRACE> isp1: Connected
>2024-08-01 12:43:19.074 <TRACE> isp1: Sending OPEN(ver=4,as=65526,hold=240,id=d8735c8c)
>2024-08-01 12:43:19.078 <TRACE> isp1: Connection lost (Connection reset by peer)
>2024-08-01 12:43:19.078 <TRACE> isp1: Connect delayed by 5 seconds
>2024-08-01 12:43:19.287 <TRACE> isp2: Connecting to <redacted>from local address <redacted>
>2024-08-01 12:43:19.288 <TRACE> isp2: Connected
>2024-08-01 12:43:19.288 <TRACE> isp2: Sending OPEN(ver=4,as=65526,hold=240,id=d8735c8c)
>2024-08-01 12:43:19.494 <TRACE> isp2: Got OPEN(as=23005,hold=180,id=<redacted>)
>2024-08-01 12:43:19.494 <TRACE> isp2: Sending KEEPALIVE
>2024-08-01 12:43:19.495 <TRACE> isp2: Got KEEPALIVE
>2024-08-01 12:43:19.495 <TRACE> isp2: BGP session established
>2024-08-01 12:43:19.495 <TRACE> isp2: State changed to up
>2024-08-01 12:43:19.495 <TRACE> isp2: Sending END-OF-RIB
>2024-08-01 12:43:19.536 <TRACE> isp2: Got UPDATE
>2024-08-01 12:43:19.536 <TRACE> isp2.ipv4 > added [best] 0.0.0.0/0 0L 2G unicast
>2024-08-01 12:43:19.536 <TRACE> isp2.ipv4 < rejected by protocol 0.0.0.0/0 0L 2G unicast
>2024-08-01 12:43:23.578 <TRACE> isp1: Connecting to <redacted> local address <redacted>
>2024-08-01 12:43:23.578 <TRACE> isp1: Connected
>2024-08-01 12:43:23.578 <TRACE> isp1: Sending OPEN(ver=4,as=65526,hold=240,id=d8735c8c)
>2024-08-01 12:43:23.782 <TRACE> isp1: Got OPEN(as=23005,hold=180,id=<redacted>)
>2024-08-01 12:43:23.782 <TRACE> isp1: Sending KEEPALIVE
>2024-08-01 12:43:23.783 <TRACE> isp1: Got KEEPALIVE
>2024-08-01 12:43:23.783 <TRACE> isp1: BGP session established
>2024-08-01 12:43:23.783 <TRACE> isp1: State changed to up
>2024-08-01 12:43:23.783 <TRACE> isp1.ipv4 < filtered out 0.0.0.0/0 0L 2G unicast
>2024-08-01 12:43:23.783 <TRACE> isp1: Sending END-OF-RIB
>2024-08-01 12:43:23.788 <TRACE> isp1: Got UPDATE
>2024-08-01 12:43:23.788 <TRACE> isp1.ipv4 > added [best] 0.0.0.0/0 0L 3G unicast
>2024-08-01 12:43:23.788 <TRACE> isp2.ipv4 < filtered out 0.0.0.0/0 0L 3G unicast
>2024-08-01 12:43:23.788 <TRACE> isp1.ipv4 < rejected by protocol 0.0.0.0/0 0L 3G unicast
>2024-08-01 12:43:29.463 <TRACE> isp2: Got UPDATE
>2024-08-01 12:43:29.463 <TRACE> isp2: Got END-OF-RIB
>2024-08-01 12:43:33.765 <TRACE> isp1: Got UPDATE
>2024-08-01 12:43:33.765 <TRACE> isp1: Got END-OF-RIB
>2024-08-01 12:44:09.966 <TRACE> isp2: Sending KEEPALIVE
>2024-08-01 12:44:18.548 <TRACE> isp1: Sending KEEPALIVE
>2024-08-01 12:44:29.465 <TRACE> isp2: Got KEEPALIVE
>2024-08-01 12:44:33.766 <TRACE> isp1: Got KEEPALIVE
>2024-08-01 12:44:57.910 <TRACE> isp2: Sending KEEPALIVE
>
>It seems to add the default route, then reject it?
>
>-Eric
>
>From: Eric Robinson
>Sent: Thursday, August 1, 2024 2:26 PM
>To: Maria Matejka <maria.matejka at nic.cz>; bird-users at network.cz; bird-users at network.cz
>Subject: RE: Bird 2.14 Starts but Won't Bind to Port 179
>
>I do not. Following is the whole config. (The IPs and ASNs are bogus.)
>
>Our need is simple. We don’t need to advertise any routes. We just need to get the default route from the ISP and ignore everything else.
>
>[root at fw9b etc]# cat bird.conf
>log "/var/log/bird.log" all;
>
>router id 4.4.92.140;
>
>protocol bgp isp1 {
> description "BGP with ISP Router 1";
> local as 65111;
> neighbor 4.4.92.130%red0 as 23222;
> debug all;
> ipv4 {
> import filter {
> if net = 0.0.0.0/0 then accept;
> reject;
> };
> export none; # Do not export any routes to ISP
> next hop self;
> };
>}
>
>protocol bgp isp2 {
> description "BGP with ISP Router 2";
> local as 65111;
> neighbor 4.4.92.131%red0 as 23222;
> debug all;
> ipv4 {
> import filter {
> if net = 0.0.0.0/0 then accept;
> reject;
> };
> export none; # Do not export any routes to ISP
> next hop self;
> };
>}
>
>From: Maria Matejka <maria.matejka at nic.cz<mailto:maria.matejka at nic.cz>>
>Sent: Thursday, August 1, 2024 2:18 PM
>To: bird-users at network.cz<mailto:bird-users at network.cz>; Eric Robinson <eric.robinson at psmnv.com<mailto:eric.robinson at psmnv.com>>; bird-users at network.cz<mailto:bird-users at network.cz>
>Subject: Re: Bird 2.14 Starts but Won't Bind to Port 179
>
>Hello,
>
>do you have
>protocol device {}
>in your config?
>
>Maria
>
>On 1 August 2024 20:41:23 CEST, Eric Robinson <eric.robinson at psmnv.com<mailto:eric.robinson at psmnv.com>> wrote:
>
>Bird starts, and claims that it is waiting for the upstream routers to become neighbors…
>
>2024-07-31 06:25:25.774 isp1: Initializing
>2024-07-31 06:25:25.774 isp2: Initializing
>2024-07-31 06:25:25.774 isp1: Starting
>2024-07-31 06:25:25.774 isp1: State changed to start
>2024-07-31 06:25:25.774 isp2: Starting
>2024-07-31 06:25:25.774 isp2: State changed to start
>2024-07-31 06:25:25.774 Started
>2024-07-31 06:25:25.775 isp2: Waiting for 4.4.92.131 to become my neighbor
>2024-07-31 06:25:25.775 isp1: Waiting for 4.4.92.130 to become my neighbor
>
>…however, I can see in tcpdump that bird is refusing BGP connections…
>
>08:50:31.055601 IP 4.4.92.130.34302 > 4.4.92.140.179: Flags [S], seq 733565924, win 16384, options [mss 1424,wscale 0,nop,sackOK,eol], length 0
>08:50:31.056685 IP 4.4.92.140.179 > 4.4.92.130.34302: Flags [R.], seq 0, ack 733565925, win 0, length 0
>
>…and that’s because bird is not listening…
>
>[root at fw9b log]# netstat -ant
>Active Internet connections (servers and established)
>Proto Recv-Q Send-Q Local Address Foreign Address State
>tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
>tcp 0 0 0.0.0.0:53 0.0.0.0:* LISTEN
>tcp 0 0 127.0.0.1:8953 0.0.0.0:* LISTEN
>tcp6 0 0 :::1013 :::* LISTEN
>tcp6 0 0 :::444 :::* LISTEN
>tcp6 0 0 :::81 :::* LISTEN
>
>Bird is running...
>
>[root at fw9b log]# ps ax|grep bird
>20738 pts/0 S+ 0:00 grep bird
>29732 ? Ss 0:00 /usr/sbin/bird
>Strace shows that it is not binding to the port.
>
>I read a full thread about this exact symptom here: https://bird.network.cz/pipermail/bird-users/2020-September/014824.html
>
>Unfortunately, I’m brand new to bird and I was unable to follow some of it.
>
>-Eric
>
>
>Disclaimer : This email and any files transmitted with it are confidential and intended solely for intended recipients. If you are not the named addressee you should not disseminate, distribute, copy or alter this email. Any views or opinions presented in this email are solely those of the author and might not represent those of Physician Select Management. Warning: Although Physician Select Management has taken reasonable precautions to ensure no viruses are present in this email, the company cannot accept responsibility for any loss or damage arising from the use of this email or attachments.
>--
>Maria Matejka (she/her) | BIRD Team Leader | CZ.NIC, z.s.p.o.
>Disclaimer : This email and any files transmitted with it are confidential and intended solely for intended recipients. If you are not the named addressee you should not disseminate, distribute, copy or alter this email. Any views or opinions presented in this email are solely those of the author and might not represent those of Physician Select Management. Warning: Although Physician Select Management has taken reasonable precautions to ensure no viruses are present in this email, the company cannot accept responsibility for any loss or damage arising from the use of this email or attachments.
--
Maria Matejka (she/her) | BIRD Team Leader | CZ.NIC, z.s.p.o.
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