Why DNS Firewalls Are Essential In Today's Enterprise Landscape

Posted by B. Hale

As malware becomes increasingly complex, a good preventative measure is almost essential. These days, over 90% of all malware targets the DNS layer, so a DNS firewall is becoming almost essential to maintain a feeling of security in your business. It's safe to say that on the checklist of items on any security audit, this type of firewall is creeping to the top.

An Intro to DNS Firewalls

Attention to DNS resolvers is becoming increasingly important in today's landscape. As a result, secure DNS resolvers forming a firewall around the DNS are becoming a vital layer of defense to protect against advanced persistent threats.

DNS firewalls work by preventing the enterprise systems access to known malicious addresses. It also prevents known malicious addresses from accessing the enterprise network. This is done through a blacklist type of strategy with ever-updating lists of malicious addresses. This of course is done at the DNS level, so any attempted connections are blocked before they ever even reach the office network, let alone a computer or server.

One of the major advantages of DNS firewalls is that the foundation is likely already in place on your network. There's no hardware to install or intrusive software. It can be deployed rather simply within a few days or possibly even hours. There are resources available at www.bluecatnetworks.com for more information.

Why Is It Important?

DNS resolvers are like a gateway that connect your systems to the internet at large. If a connection is allowed by the DNS to be made to a malicious location, your company data and security could be at risk. You could lose customer data, and thereby their confidence. You could infect your systems with ransomware. There are a plethora of negative possibilities.

Because a DNS simply acts like a phonebook to look up an address, it doesn't block any connections from being made. But if your input can be translated and looked up and then determined to be malicious, that connection can then be blocked. Imagine if your phonebook told you the address you're looking up is flagged for having a murderer living there. You probably wouldn't want to go there. The idea is similar.

The DNS firewall can also identify infected computers on your network and prevent those computers from sending information to the outside world.

As criminals and hackers are running increasingly amok in the frontier of the internet, solutions like DNS firewalls are an essential first line of defense to secure enterprise networks and keep data safe and secure.