What are IP-Based Access Control Systems?
One method that can control access is using an IP address. Networks and the Internet communicate with an IP address. Think of it as a phone number, with an area code. The area code identifies the network, and the phone number identifies the host on the network, like a PC, or server, or printer.
An IP-based access control system can control an entire network or range of networks from accessing the network. An IP-based system uses an IP address, like 18.104.22.168 plus a subnet mask, like 255.255.0.0. The combination of the two can be used as a filter to control the traffic on the network. It can control access into and exit out of the network.
Besides IP addresses, you can control access via a port, like port 80, for the Internet. Or you can control traffic based on protocols, like IP or udp. You can also control traffic based on certain computer operations, like file transfer or logging on remotely via telnet.
Programs exist that can help control access based on the IP address. The image shows how to set it up and what can be controlled with it.
Image - Download Source Internet Access Controller
(A discussion of IP#'s and subnet masks can be found at the links in the summary below.)