AF_INET is the IP version 4 address family, AF_INET6 is IPv6. 7/
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On IPv6 machines will create, for each advertised prefix, a permanent IPv6 address (from MAC) and a temporary one (random)
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The temporary ones are rotated regularly (the old ones are kept around for a while as "deprecated" to keep old sockets open)
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Is there a purpose other than breaking things?
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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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