[lug] funky portforwarding ssh tunneling problem

[dan radom]

It seems my first reply didn't make it to the list for some reason.  What you need to do is...

ssh -L5000:mainframe:23 user at linuxserver

What you have says forward localhost (-L) to localhost.  that won't work :)

Here's what I use...

ssh -2 -L9110:pop:110 -L 9111:pop:25 -L8080:webproxy:80 -L7326:icb:7326 dradom at ssh.redback.com

dan


* Hugh Brown (hugh at vecna.com) wrote:
> I have an old legacy mainframe that only accepts telnet connections.  I
> want to secure as much of the traffic to it as I can.  So, I am putting a
> linux box next to it (on the same subnet) and I am setting up an ssh tunnel
> to the linux box.  I want to use the linux box to forward that port to the
> mainframe.
> 
> client<----ssh tunnel----->linuxserver<---portforward--->mainframe
> 
> I want to be on the client and type `telnet localhost 5000` and have it
> make it to the mainframe with the data encrypted most of the way.
> 
> on client I have done this:
> 
> ssh -L 5000:localhost:23 linuxserver
> 
> on the linux server I tried allowing access on the telnet port and doing
> this
> 
> ipmasqadm portfw -a -P tcp -L linuxserver 23 -R mainframe 23
> 
> but I am having no luck with the linuxserver to mainframe jump.
> 
> I am not dead set on using ipchains and ipmasqadm but I do need to be able
> to encrypt the traffic from client to linuxserver and to be able to 
> 
> client% telnet localhost 5000 
> 
> and get exactly the same thing as if I had done:
> 
> client% telnet mainframe
>