[X-Unix] SSH tunnel vs. 10.3.8 vs. port forwarding

[Jeff Winchester]

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On Mar 06, 2005, at 5:40 PM, Cloyce D. Spradling wrote:

> I think the IPv6 _is_ bugging you.  Actually, I think that SSH is only
> forwarding IPv4 ports for you.  Thus the 127.0.0.1 suggestion.  But 
> I've
> been wrong before, and it'll probably happen again someday...

Very interesting thought. I follow you now, and I'll try things the 
IPv4 way just to be sure.


> Run tcpdump or some other network sniffer on your local connection and
> verify that that's really what's happening.  And you might also want to
> verify that the system to which you're connected via SSH is allowed to
> connect to your ISP's POP server.

Rather than using the SSH Tunnel Manager GUI to initiate the tunnel, I 
did things the old fashioned way:

ssh -N -p 22 -g -C -c 3des user_id at ssh_host -L 1100/pop-server/110 -L 
2500/smtp-server/25

Then I initiated my telnet session to port 1100 in another window 
(using both localhost and 127.0.0.1 to test the IPv4 theory). Here's 
what I saw in the SSH command's output:

channel 4: open failed: administratively prohibited: open failed

It would appear that the SSH host I was using doesn't allow the 
connection to the remote host to be made. I would think with a 
different SSH host I'll be OK.

Thanks for the ideas.


- -- 
Jeff Winchester
jeffw at tampabay.rr.com
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