Most people dont know that theres something called WEP and WPA in wifi devices such as the Linksys router.
When you setup a wifi at your home or office, it becomes and open source for internet. Who ever has a laptop or a wireless device within range of your router, can access the internet, or even hack into your local pcs, if the connection is left unprotected.
To protect these, there are two options that usually come with all wireless devices, called WEP and WPA.Â
So go thru your router’s manual and make sure that you enable this before starting to use the wifi connection for everyone’s safety, unless you really want it to be an open connection.