outside world ---> outside ip ---> router opens the correct port and routes the requests on that port to the internal ip
So in other words if someone is coming in on port 1300 you setup the router to route all traffic on port 1300 to your server machine using the 192.168... internal IP. You need to open two ports for a DOl server as indicated in the guides.
Here is what my router setup looks like for Storm D2
Port Internal IP of server
10300 192.168.1.###
10400 192.168.1.###
### should be replaced with the actual address.
SVN refers to a program that can grab the source from an SVN repository. This is all the source code to the DOL server and is needed if you want to do any hard core scripting. To modify the server you need to know coding basics.
This guide from the FAQ section of articles summarizes the process.
http://www.dolserver.net/articles/?article=26