YOUR PROBLEMS ARE SOLVED 
The latest Firmware fixes problems with srcds, allowing others to connect to your server!
http://www.linksys.com/servlet/Satellite?c=L_Download_C2&childpagename=US%2FLayout&cid=1115417109974&packedargs=sku%3D1127782957298&pagename=Linksys%2FCommon%2FVisitorWrapper
There ya go, happy hosting!
/edit it may require that steam isn't running for people to be able to see and connect to your server. (im not really sure though)
The latest Firmware fixes problems with srcds, allowing others to connect to your server!
http://www.linksys.com/servlet/Satellite?c=L_Download_C2&childpagename=US%2FLayout&cid=1115417109974&packedargs=sku%3D1127782957298&pagename=Linksys%2FCommon%2FVisitorWrapper
There ya go, happy hosting!
/edit it may require that steam isn't running for people to be able to see and connect to your server. (im not really sure though)