getsockname(2) gives the local address and getpeername(2) gives the remote address. UDP sockets are unbounded and unremoted on creation. 10/
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But the prefix alone compromises privacy.
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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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