DNS filtering is one of the simplest and most effective security layers you can add to a business network. It blocks threats before they ever reach your devices – no software install needed, no performance hit, works on every device connected to your network.
What DNS Filtering Does
Every time you type a website address or click a link, your device asks a DNS server “where is this website?” DNS filtering intercepts that request and checks: is this domain safe?
- Known malware domains – Blocked before the connection is made. Ransomware can’t phone home.
- Phishing sites – Employee clicks a fake PayPal link? DNS filter blocks the resolution. Page never loads.
- Command and control servers – If malware somehow gets on a device, it needs to communicate with its controller. DNS filtering cuts that communication.
- Inappropriate content categories – Block gambling, adult content, or whatever categories aren’t appropriate for your workplace.
Why It’s Different from Endpoint Protection
Malwarebytes (our EDR tool) protects individual devices. DNS filtering protects the entire network at the infrastructure level. They complement each other:
- DNS filtering – Blocks threats at the network layer before they reach any device. Covers every device on the network including IoT, phones, and guests.
- EDR (Malwarebytes) – Catches threats that bypass the network layer or arrive via USB, local files, etc. Deep device-level inspection.
Together, they create layered defense. A threat has to get past both to do damage.
How We Deploy It
DNS filtering is configured at the network level – either on your SonicWall firewall or at your router. Every device on the network is automatically protected the moment it connects. No agent to install, no configuration per device, no user action required.
For remote employees, DNS filtering agents on their devices provide the same protection regardless of what WiFi they’re connected to.
What It Looks Like in Practice
- Employee clicks a phishing link in email – page doesn’t load, threat blocked
- Compromised ad on a legitimate website tries to redirect to malware – blocked
- Malware on a device tries to contact its C2 server – connection refused
- Someone tries to access a known crypto-mining domain – blocked and logged
All of this happens silently. No popups, no interruptions. We see it in the logs and reporting – your team just sees that bad links don’t work.
Compliance Value
DNS filtering satisfies controls in SOC 2 (network security monitoring), CMMC (boundary protection), and HIPAA (network access controls). One technology, multiple compliance checkboxes.
Need IT help? Seashore IT provides managed IT for businesses with 5-250 computers across the Western US. Flat monthly rate, 30-60 minute response, 24x7x365. Call (833) 997-6886 or email info@seashoreit.com.
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