请记住，从目的地的角度来看，您隧道传输到的地址(在您的情况下为server2:6667).例如:我有一个运行ssh的VPS.如果执行 ssh -f user @ vps -L 2000:localhost:3306 ，我可以连接到运行在它上面的MySql服务器(仅在回送接口上监听).

Remember that that address you tunnel to (server2:6667 in your case) is from the point of view of the destination. For example: I have a VPS running with ssh installed. If I do ssh -f user@vps -L 2000:localhost:3306 I can connect to the MySql server running on it (which is only listening on the loopback interface).

因此，假设IRC服务器在server2上运行，您应该这样做:

So assuming the IRC server is running on server2 you should do:

you@server1:~$ ssh -f you@server2 -L 2000:localhost:6667 -N

然后，您可以使用IRC客户端连接到localhost:2000(在server1上)，并获得与在server2上运行的IRC服务器的连接.

You can then connect to localhost:2000 (on server1) with your IRC client and get a connection to the IRC-server running on server2.