If its on your LAN, Local Area Network, you have to connect by the lan IP... which is the 192.168.1.1 start. You will ALWAYS see that IP from your browser. Get your real ip (search google it takes 10 seconds).
If you want others to join, you have to give them YOUR IP. That is not your lan ip. And your router has to be setup correctly, and port 2015 forwarded to your IP.
http://www.srcds.com Should help you get some basics.
I'll laugh forever.