iBGP stuck in connect state

[Brooks Swinnerton]

Hello,

I'm having trouble configuring two BIRD instances to talk to one another
over a wireguard tunnel with iBGP. They both stay in a `Connect` state.

With debug <protocol> all, I only see:

```
Dec 05 23:31:32 border bird[3460]: foo: Connecting to 169.254.2.2 from
local address 169.254.3.3
Dec 05 23:33:19 border bird[3460]: foo: Connecting to 169.254.2.2 from
local address 169.254.3.3
Dec 05 23:35:13 border bird[3460]: foo: Connecting to 169.254.2.2 from
local address 169.254.3.3
```

The wireguard tunnel is up, and each side can ping the other:

```
PING 169.254.2.2 (169.254.2.2) 56(84) bytes of data.
64 bytes from 169.254.2.2: icmp_seq=1 ttl=64 time=66.7 ms
64 bytes from 169.254.2.2: icmp_seq=2 ttl=64 time=66.6 ms
64 bytes from 169.254.2.2: icmp_seq=3 ttl=64 time=66.8 ms
```

```
PING 169.254.3.3 (169.254.3.3) 56(84) bytes of data.
64 bytes from 169.254.3.3: icmp_seq=1 ttl=64 time=66.5 ms
64 bytes from 169.254.3.3: icmp_seq=2 ttl=64 time=66.2 ms
64 bytes from 169.254.3.3: icmp_seq=3 ttl=64 time=66.3 ms
```

I can even see some BGP traffic when doing a tcpdump:

```
23:44:16.487852 ip: (tos 0xc0, ttl 64, id 40780, offset 0, flags [DF],
proto TCP (6), length 60)
    169.254.3.3.53585 > 169.254.2.2.179: Flags [S], cksum 0x5930 (incorrect
-> 0x61e7), seq 4023371188, win 27600, options [mss 1380,sackOK,TS val
891392 ecr
0,nop,wscale 7], length 0
23:44:16.989732 ip: (tos 0xc0, ttl 64, id 29307, offset 0, flags [DF],
proto TCP (6), length 60)
    169.254.2.2.46081 > 169.254.3.3.179: Flags [S], cksum 0x3ae5 (correct),
seq 156366469, win 27600, options [mss 1380,sackOK,TS val 889856 ecr
0,nop,wscale
7], length 0
23:44:18.535863 ip: (class 0xc0, flowlabel 0xe9696, hlim 64, next-header
TCP (6) payload length: 40) fd00:169:254:3::3.47019 >
fd00:169:254:2::2.179: Flags [S], cksum 0x01b4 (incorrect -> 0x5b17), seq
1562824692, win 27200, options [mss 1360,sackOK,TS val 891904 ecr
0,nop,wscale 7], length 0
23:44:33.117481 ip: (tos 0xc0, ttl 64, id 29308, offset 0, flags [DF],
proto TCP (6), length 60)
    169.254.2.2.46081 > 169.254.3.3.179: Flags [S], cksum 0x2b25 (correct),
seq 156366469, win 27600, options [mss 1380,sackOK,TS val 893888 ecr
0,nop,wscale 7], length 0
23:44:37.610488 ip: (class 0xc0, flowlabel 0xeaf06, hlim 64, next-header
TCP (6) payload length: 40) fd00:169:254:2::2.36355 >
fd00:169:254:3::3.179: Flags [S], cksum 0x243b (correct), seq 476210459,
win 27200, options [mss 1360,sackOK,TS val 895010 ecr 0,nop,wscale 7],
length 0
23:44:38.621468 ip: (class 0xc0, flowlabel 0xd3b4f, hlim 64, next-header
TCP (6) payload length: 40) fd00:169:254:2::2.36355 >
fd00:169:254:3::3.179: Flags [S], cksum 0x233d (correct), seq 476210459,
win 27200, options [mss 1360,sackOK,TS val 895264 ecr 0,nop,wscale 7],
length 0
23:44:40.637418 ip: (class 0xc0, flowlabel 0xd41b0, hlim 64, next-header
TCP (6) payload length: 40) fd00:169:254:2::2.36355 >
fd00:169:254:3::3.179: Flags [S], cksum 0x2145 (correct), seq 476210459,
win 27200, options [mss 1360,sackOK,TS val 895768 ecr 0,nop,wscale 7],
length 0
23:44:44.893305 ip: (class 0xc0, flowlabel 0xcc08e, hlim 64, next-header
TCP (6) payload length: 40) fd00:169:254:2::2.36355 >
fd00:169:254:3::3.179: Flags [S], cksum 0x1d1d (correct), seq 476210459,
win 27200, options [mss 1360,sackOK,TS val 896832 ecr 0,nop,wscale 7],
length 0
```

The bird.conf file is identical between hosts can be found in:
https://gist.github.com/bswinnerton/9ffa236a55f120ba9491658ae74a841a.

Does anything seem amiss? What's odd is that I can establish iBGP
connections with other BGP routers that are not running BIRD with the exact
same iBGP peer configuration.

$ sudo birdc -v
0001 BIRD 2.0.2 ready.
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