What would stop people using a CNAME record to point ads.example.com to a third ... | Hacker News

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_-david-_ on May 15, 2020 | parent | context | favorite | on: Mozilla goes incubator with ‘Fix The Internet’ sta...

What would stop people using a CNAME record to point ads.example.com to a third party ad server? I don't think there would be a way to use cookies to track people across different sites, but the ad servers could still use ip addresses and browser fingerprinting to check if its the same user.

FridgeSeal on May 16, 2020 [–]

PiHole and uBlock origin support so called “deep CNAME inspection” that defeats approaches like that.

blibble on May 16, 2020 | [–]

pretty easy to defeat that CNAME inspection: switch to ANAMEs

everything will end up pointing at some random AWS IP address, and you can't filter that

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