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Android long ago implemented support for the privacy extensions of IPv6 networking. It was in 4.0 (Ice Cream Sandwich). The RFC for the privacy extensions doesn't specify (or even recommend) a TTL for temporary addresses, but typically they have a lifetime of 24 hours.

My question is how is the expiry time chosen? Is it at multiples of 24 hours after the last boot? Or it is tied to the local timezone (and happens overnight)? Or is it at random, with some jitter from a 24-hour schedule? Or something else?

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  • Another possible time may be 24 hours from the time the network had been connected and the address in question had been issued (no knowledge, just speculation).
    – Juergen
    Aug 1, 2023 at 9:51

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