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A comment on Pi-hole: A black hole for Internet advertisements. Parent comment

Re:Pi-hole: A black hole for Internet advertisements by supergauntlet on Thursday May 30, 2019 @10:37AM (#20051583)
How does a DNS blocker know what requests are caused by what site? It's a stateless protocol.
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Re:Pi-hole: A black hole for Internet advertisements by ztoben on Thursday May 30, 2019 @12:27PM (#20052862)
Yeah, that was a misunderstanding on my part.

I suppose for their whitelist/blacklist to work with regex matching the ads would have to be served from a similarly named domain. Like facebook.com vs ads.facebook.com, and you'd have to whitelist *facebook.com. And if they were getting ads externally you'd have to whitelist those ads for every site that you visit.

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