this post was submitted on 25 Apr 2026
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I'm a bit concerned about SLAAC's metadata leakage. Sending out many of my devices' MAC addresses to the world isn't exactly the best for privacy. My key devices like laptop and phone use MAC randomization, but I have a ton of other stuff that doesn't.
Damn, that's a straight WONTFIX, too since 2014. Lots of religious argument in there, maybe I'm reading all that tonight.
Thanks for answering my questions.
Modern operating systems don't use the MAC address for SLAAC. They generate a completely random address. You can choose a stable address or a temporary one that will change frequently for more privacy. You can also use both, IPv6 allows multiple addresses on one device.
Great to know, thanks!