[ILUG] Accessing SSH remotely.

[Niall O Broin]

On 22 Apr 2007, at 16:41, Darragh wrote:

>> I'm not entirely sure why but it was the AVG firewall in windows  
>> that was causing the network wide issue.

Given a network topology as in this diagram, which would be the usual  
way of connecting up a home router,

Internet
    |
    |
Router
    |
    +----------+------------------+---------------+
               |                  |               |
             Client 1          Client 2        Client 3

with port forwarding of port 22 to, say Client 2, there is no way  
that any software running on Client 1 or Client 3 can interfere with  
ssh connections to Client 2. Indeed, in a switched architecture,  
which is what you have in your tupical ADSL hpme router thingie,  
Client 1 or Client 3 don't even see packets destined for Client 2.

So, the only answer I can think of is that you don't have the  
topology above, and instead have something like this

Internet
    |
    |
Router
    |
    |   +-------+------------------+---------------+
    |   |       |                  |               |
   Windows    Client 1          Client 2        Client 3


where the router is connected directly to the Windows box (maybe via  
USB ?) and Client 1/2/3 are connected to the Windows box via Ethernet  
and are then accessing the internet via the Windows box using its  
internet connection sharing, because in that case all the packets for  
Client 1/2/3 go through the Windows box and will be affected by its  
firewall.

> Any idea about my x forwarding question? I want to access gnome  
> remotely.


ssh -X remote_ip  (or ssh -Y remote_ip for a secure connection) will  
get you a tunnelled X connection, so presuming you have a local X  
server, and aren't using putty or some such, you can start a X client  
on the remote machine which will display on your local server.  
However, you'll need to provide more details as to what you want to  
do. Gnome is a bit more than an X client, and getting a gnome desktop  
displaying remotely is possible in a number of ways (remote X, VNC,  
NX) and you need to decide which to use.




Niall