Re: Port forwarding examples

From: Stephen Carviille (stephen@heronforge.net)
Date: 02/26/02 

From: Stephen Carviille <stephen@heronforge.net>
Date: Tue, 26 Feb 2002 18:35:12 GMT

Betty Kelly wrote:

> Does anyone have any good examples of how to setup port forwarding. I
> have an external client
> that need to access my FTP server running under OpenSSH. Port 22 is the
> standard port used for the connection, but this port is not available to
> the client because of a corporate firewall. In addition when attempting to
> connect to my SSH server no replies are sent, we believe this is because
> the
> corporate firewall is also blocking the replies. The only ports
> currently
> open are 21 and 80. I can put in requests for other ports, but I need to
> understand the connection better.
>
> I think I need to specify some passive ports to use in the connection, but
> am looking for some ideas
> documentation to help me out.

AKAIK it is not practical to forward FTP over ssh. The control channel can
be readily forwrded but the data channel is difficult to get working right.
 Unless you have a pressing need for FTP, I suggest sftp instead. As for
the port, ssh can be told to run on any port. If your firewall is too
restrictive, there is a trick where you ssh _out_ from inside a firewalled
network and use remote port forwarding (-R option) to let the remote client
back in using telnet, ssh. http. etc.

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