Linux Mint writes "If you live in the middle of nowhere you probably wonder why you should secure the access to your network. If you're setting up a company network however, this probably seems obvious to you: you don't want unwanted access to the network. Even at home, with wireless networks becoming more and more popular, you could very well be concerned by this problem. For instance, if you have a Wifi router at home which connects you to the Internet, chances are that people around you (your neighbours?) are connecting through it to access the Internet via your Internet account.
There are many ways to secure a network, and even more ways to secure a wireless network. In this article we will see how to secure the access to a router by filtering the MAC addresses."