Ok to set up port forwarding for a d-link DI-514 Rev A or B, from the manual page 21.
1.) Login to the router.
2.) Click on Advanced at the top of the page.
3.) Click on Virtual Server on the left hand side of the page.
4.) Enter a name for the rule you are going to make right now.
5.) Enter the privet IP for the computer that is running the TWGS software. (to find out what the IP of that computer is go to a command prompt on the computer running the TWGS software and type in ipconfig.)
6.) Enter the port that the TWGS software is using to accept connections. (should be port 23)
7.) Enter the port that the users on the internet use to connect to your TWGS server. (should be port 23)
8.) Under schedule set to always.
9.) Click the green apply button with the check mark in it to save your new rule.
DNS is the method that computers systems use to translate human readable URL’s to IP address to make it real short there is a computer out there on the internet (DNS server) that your computer quires with a URL like
http://www.yourwebpage.com the DNS server returns the URL’s IP address so that your computer can find and connect to the web site or computer you are requesting to access.
No-ip.com basically assigns an URL to your account, provides a DNS server to resolve the URL, and by running a small TSR program on the computer connected to the internet keeps track of the IP address assigned by your ISP to the public side of your router so that if your ISP ever changes your public IP people can still find and connect to your server with out having to tell them the new IP of the router.
Hope this helps.