The Linksys allows you to forward certain ports to various IP addresses inside the LAN. I'm running a web server and a FTP server as well as a simple internal file dump for my subscribers out here all based out of my Linksys router.
As far as seeing through one of them, it is virtually impossible. The only way you can tell how many users are on the other side of my Linksys box is to start counting browser/OS reports on a webpage from my IP. I have only three high level machines in my network for my network services (all hardware firewalled), and the rest go through at least two firewall layer before they reach my primary routers.
If you know how to configure a hardware router/firewall right, you are virtually invisible to the outside world.
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#!/bin/sh {who;} {last;} {pause;} {grep;} {touch;} {unzip;} mount /dev/girl -t {wet;} {fsck;} {fsck;} {fsck;} {fsck;} echo yes yes yes {yes;} umount {/dev/girl;zip;} rm -rf {wet.spot;} {sleep;} finger: permission denied
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