In article <dv1bgh$15l$1@nsnmpen3-gest.nuria.telefonica-data.net>,
dan <x@x.com> wrote:
>Hi, I have a question about nat functionality.
>The problem is that I opened a port to access my private network. I put a
>server to listen on port 10000 and then I get my public ip address (using a
>service such as whatismyip.com) The problem is that when I telnet to this
>public ip and port, the server in my machine doesn't get anything, but if I
>try this from "outside", then the server receives the conection! How can
>this be? Why putting the public ip inside my private network doesn't work?
>Shouldn't this be treated as any other conection? (Of course, if I connect
>to the loopback or private ip, the server receives ok)

You have not indicated which equipment you are using.

For example, the Cisco PIX running software up to 6.x, is specifically
designed to prevent packets that enter through one interface
from going out the same interface. This was deliberate, to prevent
people from violating policy by deliberately bouncing their packets
off of the PIX.