In this article we will be covering SSH port forwarding also known as SSH tunneling.
As previously discussed in our previous article Proxing Web Traffic across a SSH Tunnel using SSH Dynamic Port Forwarding, SSH port forwarding (or tunneling) re-routes TCP/IP connections through an established SSH connection. Being encapsulated within SSH provides security benefits along with the ability to route traffic through firewalls using just port 22 (SSH).
Note : This article includes – Putty Commands (Windows) / SSH Commands (Linux)
Forwarding your local port to a remote address
This allows you to forward you local port to a remote address.
Our example is based on a VNC connection to your server over a secure connection.This will create a port of 7777 on your local host. All traffic to this port will be forwarded to your remote server IP (over ssh) to the port of 5900.
C:\Documents and Settings\admin> putty -L 7777:[Local Server IP]:5900 [Remote Server IP]
[root@linux]# ssh -L 7777:[Local Server IP]:5900 [Remote Server IP]
Forwarding a remote port to your local address
This allows you to forward a remote port to your localhost.
Our example below is based on a RDP into a workstation that is sitting behind a firewall of which you only have a outbound ssh access from.
Below will create a port of 7777 on your remote host. All traffic to this port will be forwarded to your local workstation (over ssh) to the port of 3389.
C:\Documents and Settings\admin> putty -R 7777:127.0.0.1:3389 [remote server ip]
[root@linux]# ssh -R 7777:127.0.0.1:3389 [remote server ip]
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