ssh port redirection ?

[bscott at ntisys.com]

On Wed, 25 Sep 2002, at 3:36pm, plussier at mindspring.com wrote:
> 	pll at tater:~$ ssh taz -R 8110:199.174.114.33:110
> 	pll at tater:~$ fetchmail -vc lanminds.com --port 8110 --protocol pop3

  *exasperated sigh*

  My workstation is named DRAGON.  Our mail server is named ITCHY.  Say the
intermediate computer is named LACE (it would be).  Like this:

	DRAGON -------- LACE --------- ITCHY

  First, on DRAGON, I execute this command:

	ssh LACE -L 8110:ITCHY:110

  That opens up a connection to LACE.  It also causes the SSH client to
listen on local TCP port 8110.  When the SSH client receives a connection on
TCP port 8110, it will forward the connection to the SSH server on LACE.  
The SSH server on LACE will open a connection to TCP port 110 on ITCHY.

  Next, also on DRAGON, I execute this command:

	fetchmail LOCALHOST --port 8110 --protocol pop3

  That causes fetchmail to connect to DRAGON, on TCP port 8110, using the
POP3 protocol.  SSH will get that connection, forward it over the SSH tunnel
to LACE, and make the connection from LACE to ITCHY.

  In your examples, you use -R instead of -L, and you tell fetchmail to
connect to 'lanminds.com' instead of 'localhost.

-- 
Ben Scott <bscott at ntisys.com>
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