Forwarding ports via ssh

["Bill Horne-9" <user=27@nabble.blu.org>]

 Thanks for reading this. 

I have a corporate laptop running xp, which needs virus updates and POP 
mail from the corporate server that runs nt. I need help to get an ssh 
tunnel running. 

Here's the setup: 

 _______________________ 
|                       | 
| Laptop 192.168.10.97  |  >> 
 -----------------------     | 
                             | 
 _______________________     | 
|                       |  << 
| Debian 192.168.10.90  | 
 -----------------------   >> 
                            | 
 _______________________    | 
|      NAT Router       |  << 
| Speakeasy Fixed IP    | 
| LAN addr 192.168.10.1 | 
-----------------------   >> 
                            | 
 _______________________    | 
|                       | << 
|      Cloud            | 
 -----------------------   >> 
                             | 
 _______________________     | 
|      NAT Router       |  << 
| Comcast Dynamic IP    | 
| LAN addr 10.0.0.254   | 
| Port 22 forwards      | 
|   to 10.0.0.175       | 
 -----------------------   >> 
                             | 
  _______________________    | 
|                       |  << 
| Debian 10.0.0.175     | 
 -----------------------   >> 
                             | 
  _______________________    | 
|                       |  << 
| NT Server 10.0.0.2    | 
 ----------------------- 

I can ssh into the debian box at the corporate site with no problems. 
However, when I use 

ssh -L 40110:10.0.0.2:110 <Comcast dynamic ip> 

... from the Debian box on my local lan, it sets up an ssh session to 
the Debian box on the corporate LAN as if I hadn't entered any options 
at all. The port doesn't appear to forward into the remote lan: when I 
attempt to retrieve email using the Thunderbird client on the laptop, it 
gives an error saying that "Could not connect to server 192.168.10.90: 
the connection was refused." 

I have Thunderbird set to use port 40110 with server 192.168.10.90, so I 
think that part is correct: I get the same result when I attempt to 

telnet localhost 40110 

... on the Debian box - "Unable to connect to remote host: connection 
refused". 

All suggestions welcome. 

Bill Horne 


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