我的域名已针对 ipv6 和 ipv4 进行设置。访问 https 站点时一切正常。
但是当尝试通过 ipv6 连接到 ssh 时，它不起作用。您可以在下面的日志中看到，我的 ssh 客户端首先尝试 ipv6，然后切换到 ipv4。
OpenSSH_9.2p1, OpenSSL 3.0.8 7 Feb 2023
debug1: Reading configuration data /home/asd/.ssh/config
debug1: /home/asd/.ssh/config line 1: Applying options for 8wu.de
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to url.de [2fe4:4000:66:abc::1] port 22.
debug1: connect to address 2fe4:4000:66:abc::1 port 22: No route to host
debug1: Connecting to url.de [89.34.41.52] port 22.
debug1: Connection established.
但根据 lsof，我的服务器上的端口已打开。尝试连接到 ::1 时，我也收到了响应，因此 sshd 服务似乎运行正常。
sudo lsof -l | egrep 'LISTEN' | egrep ssh
sshd 43354 0 3u IPv6 179515 0t0 TCP *:ssh (LISTEN)
sshd 43354 0 4u IPv4 179517 0t0 TCP *:ssh (LISTEN)
如果我使用 nmap 映射我的服务器，端口将被关闭（正如 sshs 输出所预期的那样）
nmap -p22 -6 -Pn url.de
Starting Nmap 7.93 ( https://nmap.org ) at 2023-03-05 18:15 CET
Nmap scan report for url.de (2fe4:4000:66:abc::1)
Host is up.
Other addresses for url.de (not scanned): 89.34.41.52
PORT STATE SERVICE
22/tcp filtered ssh
Nmap done: 1 IP address (1 host up) scanned in 2.16 seconds
我在服务器上使用了防火墙，但未发现任何与 ipv6 有关的信息。有什么信息可能阻碍了我的流量吗？
我做了一个 tracerout6：
sudo tcptraceroute6 -m 60 2a03:4000:66:cbd::1 22
traceroute to 2a03:4000:66:cbd::1 (2a03:4000:66:cbd::1) from 2508:ed:4210:3109:9b92:89d:74db:ad8b, port 22, from port 16068, 60 hops max, 60 bytes packets
1 abc.dip0.t-ipconnect.de (2003:af:4123:3109:1213:51ff:fecf:b5a8) 0.588 ms 0.375 ms 0.383 ms
2 2003:0:8004:5800::1 (2003:0:8004:5800::1) 10.816 ms 9.000 ms 8.563 ms
3 * * *
4 2003:0:1304:8032::1 (2003:0:1304:8032::1) 17.546 ms 63.950 ms 18.037 ms
5 2a00:11c0:47:1:47::140 (2a00:11c0:47:1:47::140) 20.733 ms 21.004 ms 20.215 ms
6 2a00:11c0:47:3::fb (2a00:11c0:47:3::fb) 21.080 ms 21.066 ms 21.206 ms
7 * * *
8 * * 2a03:4000:ff00:4::2 (2a03:4000:ff00:4::2) 2024.167 ms !H