Hello,
Depends on what you want to do. If there are a handful of sites that you would like to prevent people from accessing, you may either exclude the site from DNS, or firewall them out. But if you want to target and block a variety of sites, such as "all porn" or things on the like, then you will need a managed subscription service to keep updating the "evil list"
Enjoy,
Christian
kc0arf
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