I have a Cisco Linksys Router, and was wondering is it possible to host with it? I tried and it won't let anyone join. Does anyone have any tips on how to get it to work?
Have you tryed going to the router configuration and setting forward there?

You can go to it by doing this:

Go to Start
Then in Search Box put CMD and press enter
then in CMD (Command Prompt) put ipconfig
Get the Default gateway IP and try to enter using your explorer.

This is my way. I don't know if this will work.
In response to Ocean King
Two ways, setup DMZ hosting for your host machine's network IP (disable port forwarding) or enable port forwarding for your machine's network ip with a specified port range and use those ports to host your game. You can do this from your router's configuration page via explorer using your router's network ip address, generally You can verify this via ipcofnig in command prompt under Gateway.

Message me if you need more assistance.
In response to Aeon_nova
Thanks for the help guys.