SSH Tunnel to other SSH servers?

Question

I'm not sure how this can be done, with or even without an SSH tunnel.
Here's my scenario:
PowerBook@Work --> Firewall --> INTERNET --> Linksys Router/Firewall with port forwarding to Mac mini home server --> Mac mini --> Other Mac clients
Obviously I can SSH into my Mac mini server from my PowerBook at work:
ssh [email protected]
However, what I want to do is, to ssh to the Other Mac client on my home LAN from my Work LAN. So far I accomplish this by SSH'ing into my Mac mini server and then SSH'ing from there to my other Mac clients (which all have static 192.168.X.X addresses).
I have tried the following and it's doesn't seem to work:
ssh -N -p 22 [email protected] -R 2110/example.com/22
With port 2110 forwarded from my Linksys to my Other Mac client. Doesn't work.
I know this is one of those scenarios where I "can't see the forest through the trees". Meaning, there must be an easier way? Any help?

Answer 1

Paul,
sorry for my mistake. I forgot the "yes" in the commandline.
I wouldn't put all the different ssh connections into aliases of my .bashrc. SSH offers the use of a config file. Put everything there. It's easier to maintain and the recommended way for ssh.
Create a plain text file in ~/.ssh/config (for example with vi). And put the following stuff in there.
Host nicknameforyourhost
Hostname hostname.example.com
User yourusername
In Addition you might want to add one of these:
Port 22
Protocol 2
Compression yes
ForwardX11 yes
You can even put portforwardings, reflections etc. in there.
LocalForward 10548 127.0.0.1:548 To tunnel AFP on the server.
LocalForward 10080 127.0.0.1:80 To tunnel to an webserver running on the host that is blocked by the firewall.
To tunnel ServerAdmin, Workgroup Manager and Server Monitor Connections to the host (if it's running Mac OS X Server)
LocaLForward 311 127.0.0.1:311
LocalForward 625 127.0.0.1:625
LocalForward 687 127.0.0.1:687
You then connect your admin apps to localhost. This one has to be done as root, as you're forwarding privileged ports.
To forward an http connection to the webinterface of your router through the tunnel. Provided your LAN Range is 192.168.1.0 and your router is located at 192.168.1.1.
LocalForward 10080 192.168.1.1:80
You then connect your browser to http://localhost:10080/ and it will go through the tunnel, and be reflected from the host you connected to via SSH directly to the router. That way you could access your routers config pages without activating remote administration which is of course a lot more secure.
For your particular problem:
Create one Host entry with the actual machine that you connect to.
Host myserver
Hostname myserver.example.com
User yourusername
Protocol 2
Port 22
Compression yes
LocalForward 10080 192.168.1.1:80 see example with router above
LocalForward 10022 192.168.1.100:22 to create a ssh portreflector for host 192.168.1.100
This config will allow you to connect to your server and access your router like I described above and also create a tunnel for another ssh connection to 192.168.1.100. To access that machine, create a second config in that file just a few lines below.
Host myothermac
Hostname localhost
User yourusername
Protocol 2
Port 10022
To use all that you enter into your terminal:
$ ssh myserver
Password:
and from a second terminal:
$ ssh myothermac
Password:
You're directly taken to the othermac. You can put as many options in ther as you like. See the man page for SSH what else you can put into a config file. I hope by now is clear why not to use aliases in your .bashrc. Do some experimenting, you cannot hurt anything.
You could also do that from a screen session or just background the first SSH session from the terminal but that would make things unnecessarily more complex for the examples given.
Hope that helped.
Regards MacLemon