this post was submitted on 01 Aug 2025
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We don't talk about IPv5 (infosec.pub)
submitted 23 hours ago by qaz@lemmy.world to c/programmer_humor@programming.dev
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[–] qaz@lemmy.world 13 points 18 hours ago (2 children)

Could you link the privacy extension in question I haven't heard of it

[–] kieron115@startrek.website 22 points 18 hours ago* (last edited 18 hours ago) (1 children)

it's not a browser extension, its a SLAAC thing https://www.internetsociety.org/resources/deploy360/2014/privacy-extensions-for-ipv6-slaac.

TL;DR is that SLAAC used to use part of your device MAC to form it's IP, which would be trackable/fingerprintable. Now devices just pick the last 48-bits at complete random on the assumption that no other device is going to have that specific address out of the 4 quintilion available addresses.

edit the RFC https://datatracker.ietf.org/doc/html/rfc4941

[–] qaz@lemmy.world 7 points 17 hours ago

Thanks, might have to try that sometime.