What is DNS filtering?
DNS filtering is the practice of blocking access to certain sites for a specific purpose, often content-based filtering. If a site, or category of sites, has been deemed a threat, then its IP address is blocked with a DNS filter and access to it is prevented. Examples of sites that may be blocked include adult, gambling, productivity sinks, or those known to pose a significant malware risk.
DNS filtering is essential for businesses because it can severely limit the amount of threats a network is exposed to, helping to reduce significantly reduce the remediation time. In fact, effective DNS filtering can stop over 80% percent of internet-borne malware before it even reaches the network.
Other Benefits of a DNS Filter
In addition to protecting an organisation’s network against the risk on web-borne threats, a DNS filter can be used to restrict access to productivity-sapping websites that employees may use for “cyber-slacking”. Research has indicated that the average employee wastes around two hours each day on time wasting websites such as gaming, shopping and social media. That’s an extra day each week of productivity!
What is DNS?
The internet’s Domain Name System (DNS) is like the phone book for the web. It works by translating your favorite URL—your go-to news source or favorite blog—into a language computers can understand. That language, the language of IP addresses, is a strings of digits like 220.127.116.11. Since it’d be a pain to memorize these digits for each of the sites you visit, DNS translates them into the common names you know them by.