Shulou(Shulou.com)06/03 Report--

[background]

There are three hosts A, S, B, and the system is all Linux. Host An and host B are in different private networks, and host S is a CVM with a public network IP. Both host An and host B can connect to host S through ssh. As shown below:

[demand]

Host A needs to connect to host B through host S.

[methods]

1. Set up the host S.

1.1. edit / etc/ssh/sshd_config file, modify or add:

GatewayPorts yes

Restart the sshd service.

Sudo service sshd restart

2. Set up host B.

2.1. method 1: use ssh

Ssh-fNR portS:localhost:22 userS@pubIpS# portS is an open port of host S # userS is a user of host S # pubIpS is the public IP of host S

2.2.2.Method 2: use autossh

The autossh-M 3456-NR portS:localhost:22 userS@pubIpS-p2cm-M parameter is not quite understood. It is probably listening through this port for automatic reconnection. # after entering the password, you can put it in the background with Ctrl-Z

3. After host A connects to host S through ssh. Connect host B like this:

Ssh userB@localhost-p portS# userB is the user of host B # portS is the same port as the portS in the previous step

Related reading: SSH reverse connection and Autossh

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