This is a general overview of basic concepts in Wide Area Networks and Local Area Networks. If things like subnets, gateways and IP addresses confuse you -- you certainly should be reading this.
Basically, if you want to reach your DS across the Internet and you're not so sure how this should be done, this application note should answer your questions.
Amongst the subject we'll take up:
|•||What are Subnets, and how many hosts can one subnet contain.|
|•||Port Forwarding and how to connect to a DS which is inside of a LAN, from the outside.|