SSH Tunnel - How does it works?

Hi list,
        Using SSH Tunneling, I was wondering how does
it really works in the following scenario:

Host1 running putty with tunneling on port xx, and
redirecting its traffic to Host2, and Host3 accessing
host 1 via port xx.

  | Host3    |     |    Host1    |     |   Host2  |
  | traffic: | --> |SSH tun on xx| --> | receipt: |
  |(Host1:xx)|     |redir. Host2 |     |(Host1:xx)|

The idea is that Host1 redirects Host3:xx to Host2,
but the question is: When traffic from Host2 comes
back to Host1 as a reply of the former packet, how
does Host1 REALLY knows that the packet must be
forwarded to the tunnel and not, for example, to its
Default Gateway?

I think it should add some kind of dynamic route for
that single connection, or keep some kind of table to
'know' that the answer should be lead to the tunnel,
but those are only suppositions... Maybe any of you
have the correct answer.

Thanks in advance.

Pablo D. Hauser | pH
www.securearg.net | Secure from the source




        


        
                
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