Awesome, linksys is actually one of the best routers you can buy for a home network. Whats the model number, I also have a Linksys router. BFSR81 or something. Portfowarding is a lot easier then you think wir, but I really don't think you need that for now. You shouldn't let all the technical talk intimidate you cause really, I know just as much as you do, seriously haha.
If your model is the same then you can do what I did.
First off using some kind of web browsing program like internet explorer or Firefox access your router. you do this by typing in
http://192.168.1.1 you will then be prompted to log on. Just type in " admin " in the password section and hit enter and then you can configure your router. On the front page you will see something that says Internet Set-up. Some where in that box there should be an option that says "MTU:" and you can check enable or disable. I believe Linksys routers are disabled by default, so just enable it. After that, a greyed out box with the words Size next to it should become ungreyed. There you type 1420. After that, save settings. and try logging on to PSU and see if it works. If not you may need to port foward which I'll tell you how to easily if needed.
