A DNS firewall is a cyber security defense that uses the DNS protocol to prevent endpoints (laptops, workstations, servers, IoT devices, etc.) from acquiring an IP address (A record) to a malicious or unauthorized destination. This technology is also known as DNS Filtering or Protective DNS.
How does a DNS Firewall Work?
For example, Securd's DNS firewall is a proprietary DNS recursor that is a resolving DNS name server. Our DNS firewall works by accepting a DNS request, processing it through a security policy framework, and determining if the DNS request can continue or be rejected. If the requesting client cannot resolve the host name, it will not be able to get the IP address information required to connect to its target.
DNS Firewalls Protect Against Web Delivered Cyber Threats
Securd DNS filtering provides multiple layers of security to endpoints connecting directly to the Internet. It offers protection from web delivered attacks including phishing, ransomware, malware, adware and cryptomining. Securd also proactively defends against threats by enforcing zero-trust security policies, and isolating new and untrusted domains from ever being to deliver a new attack against end users and endpoints.