Leaving a wireless network open to the public, is a tremendous
michshol ("stumbling block") for children and adults. It allows
anyone with a device that connects to WiFi to access the
unrestricted internet. We strongly recommend owners of wireless
networks to password-protect them, only allowing internet access
to approved people and devices, by following the following
simple steps. There are two ways of locking your wireless
network: - The first is by creating a password, so that only
someone with the password can access the internet. - The second
way, which is more secure, only allows access to devices on a
"permitted list". This works by using a unique identifier for
each device, called a MAC address. With this system, only
specified computers and devices can access the wireless network.
Below are instructions (provided by GetNetWise.org ) for several
specific models of wireless routers. If your router is not on
the list, you can use these general instructions.