While there are people who uses the VPN in order to access some sites which one normally cannot access, there are also many who wants or needs to limit or filter contents especially unwanted ones like advertising or pornography. Most solutions delivery are based on client, server, appliance or managed-service based one.
The most common method of content filtering is by use of the Domain Name Service (DNS).
Each device on computer network has a unique IP address, a subnet mask, a gateway and at least one DNS. And in a nutshell, the DNS converts a website to its ip address equivalent. In the internet world, almost all popular sites have their ip address of its hosted content mapped, as an example www.google.com is converted to its ip address and then the DNS server maps out a path from your machine to the website you want to go. Hence, DNS is a serviced-repository of sorts which allow your device to navigate the web. Thus, many use DNS as their firstline of ‘firewall’ to filter contents.
You may google for free dns servers out there by its type of filtering service for you purpose and the dns server’s ip as your DNS on your device, like your home router, so that your home network devices are filtered according to your desired service.
