Such software is unusable on DHCP (or in the distant past, on dialup). I actually had to patch out the idiocy in lots of sw back then.
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But it's actually useful that machines use a consistent suffix across all prefixes. I know ...:7ec4 is my router whether ULA or global
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Yes. I see the value in 2 addresses, one predictable and one not. Don't see the value in randomizing & cycling the latter.
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Because otherwise you have a unique 64-bit ID which follows your machine around across networks
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No, my proposal was hash(prefix+mac+secret). Without knowing secret you can't track across networks (differing prefixes).
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but then you have different suffixes across different concurrently active prefixes
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Why is that a problem? If anything it seems like an advantage for privacy.
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Which a third party can also see if you connect to resources they control via more than one interface (e.g. VPN and non-VPN)...
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