The address must be the address of any network interface, or the any address (0.0.0.0, ::) to say you are OK with whatever interface. 12/
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Depends upon how often your ISP changes your prefix. Also, the same suffix is used across all prefixes...
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...so if it didnt' change you could track devices as they moved across networks
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Seems like instead of random suffix you could just use prefix+mac hashed with a secret.
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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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