DNS-level filtering basics
DNS filtering blocks selected domain lookups before a device connects to them. It can cover many devices at once, but it cannot remove every ad format or content served from the same domain as wanted material.
Firmware controls and add-ons
Merlin’s DNS and scripting options can support custom filtering workflows. Add-ons may extend reporting, list management or automation, but they also add maintenance responsibility.
Avoid overblocking
Large or aggressive filter lists can break apps and websites. Start with a conservative configuration and keep a straightforward way to allow required domains.
Performance and privacy considerations
Router memory, CPU and storage can influence advanced add-ons. Also review the privacy properties of any DNS resolver you choose, because filtering decisions may be handled by that resolver.
Practical takeaway
Keep changes model-specific, document your current settings, and test one change at a time. That approach makes future upgrades and troubleshooting much easier.