How To: Tunnel Connections Over SSH

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I’ve been doing some work involving an application that┬áneeds to query databases on separate servers however one of the servers will only accept mysql connections locally so the way round it is to forward connections from a port on one system to a port on a remote system. That way the connection to the remote database will appear as though it originated locally and be accepted.

To set up a tunneled connection you issue the following command on any client:

ssh -fNg -L 3307:127.0.0.1:3306 myuser@remotehost.com

The first command tells ssh to log in to remotehost.com as myuser, go into the background (-f) and not execute any remote command (-N), and set up port-forwarding (-L localport:localhost:remoteport ). In this case, we forward port 3307 on localhost to port 3306 on remotehost.com.

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