I found this really cool app . If you wanna remote control a catalyst over the internet and you don't have a public internet IP you may want to use this application called HAMACHI !!!

from http://spaceants.net/hamachix/ :


" HamachiX is the frontend for Mac OS X to hamachi, a secure mediated VPN client. This allows to create virtual private networks between many clients through firewalls in most cases, for more details check out the hamachi homepage. "

Thanks Josh