For an IT team, DNS filtering is cheap to run and covers every device on the network, but only while traffic actually goes through your filter. These guides deal with the gaps that show up in practice.
Stopping DNS filtering bypass explains how browsers' encrypted DNS, iCloud Private Relay, VPNs and hard-coded DNS servers skip your filter, and how to close each route. DNS protection on public Wi-Fi covers laptops and phones that leave the office, where café, hotel and airport networks hand out their own DNS, and the two ways to keep filtering on. New to the topic? Start with What is DNS filtering?
Both guides assume filtering is already on at the network edge. If it isn't, the firewall setup guide covers that first step.
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