Date: Mon, 19 Nov 2001 19:33:28 -0500 From: Chris Ptacek <cptacek@sitaranetworks.com> To: "'freebsd-questions@freebsd.org'" <freebsd-questions@freebsd.org> Subject: SSH forwarding questions. Message-ID: <31269226357BD211979E00A0C9866DAB02BB974C@rios.sitaranetworks.com>
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What I am trying to do is setup forwarding of a port (5907) from the remote
machine (server) to my local machine (client) using a different port (5901).
The setup looks a little like this:
Client NAT/Firewall
+---+ +---+
| 1 |----| 2 |---> Internet
+---+ +---+
+---+ +---+
Internet -->| 3 |----| 4 |
+---+ +---+
Server/NAT Remote machine behind NAT
I would like to connect (with SSH) from machine 1 to machine 3 and setup
remote forwarding of the port. When machine 4 tries to connect to the given
port on machine 3 it is forwarded to machine 1. The command I am trying is
as follows:
ssh -C -l<username> -R 5907:localhost:5901 <IP of machine 3>
Machine 1 is running FreeBSD 3.1
Machine 3 is running FreeBSD 4.4
I can make the ssh connection between Machine 1 and Machine 3, but it
doesn't seem to be forwarding the ports.
Some other tests I did:
On a FreeBSD 3.1 machine on the same subnet as Machine 1 I tried the above
command. I was able to successfully forward the port and connect.
On a FreeBSD 4.3 machine on the same subnet as Machine 1 I tried the above
command. I was not able to successfully forward the port and connect.
I am guessing that this may not be a NAT issue since I also seem to be
having troubles with the 4.3 box on the local subnet. The difference is
that a netstat -na shows the listening on 5907 on the 4.3 box (can't connect
though) while a netstat -na doesn't show anything listening on 5907 on
machine 3.
Any information on how to solve this problem would be greatly appreciated.
Is this a configuration problem, a NAT issue, or both?
Thanks,
Chris
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