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Tue, May 31, 2016 9:27 pm

Establishing a SOCKS proxy using an SSH client

You can establish a Socket Secure (SOCKS) server on a Secure Shell (SSH) server using the -D option to the ssh client command.

     -D [bind_address:]port
             Specifies a local “dynamic” application-level port forwarding.
             This works by allocating a socket to listen to port on the local
             side, optionally bound to the specified bind_address.  Whenever a
             connection is made to this port, the connection is forwarded over
             the secure channel, and the application protocol is then used to
             determine where to connect to from the remote machine.  Currently
             the SOCKS4 and SOCKS5 protocols are supported, and ssh will act
             as a SOCKS server.  Only root can forward privileged ports.
             Dynamic port forwardings can also be specified in the configura-
             tion file.

             IPv6 addresses can be specified by enclosing the address in
             square brackets.  Only the superuser can forward privileged
             ports.  By default, the local port is bound in accordance with
             the GatewayPorts setting.  However, an explicit bind_address may
             be used to bind the connection to a specific address.  The
             bind_address of “localhost” indicates that the listening port be
             bound for local use only, while an empty address or ‘*’ indicates
             that the port should be available from all interfaces.

E.g., if I wished to create a SOCKS proxy server at the SSH server end from an SSH client using the registered port commonly used as the listening port for a SOCKS proxy, i.e., TCP port 1080, I could use the command below, assuming that I have a jdoe account on the SSH server at example.com.

$ ssh -D 1080 jdoe@example.com

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[/network/proxy] permanent link

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