i am using BSNL Leoxsys wifi modem. i need the step by step process of blocking unknown users who use my wifi. this setting i can do it in my android mobile.
Change the wireless SSID and password (use strong password)on your router.
Make a list of devices which you have and connect them one by one to your network. As you connect you will see their MAC address getting registered. Note down these MAC addresses and add them to your ALLOWED MAC ADDRESS LIST and Save the settings.
This way no one will be able to guess your allowed MAC addresses and