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anyone know how I can use DHCPv6 on supported devices, have Android devices still work, and not have most devices get two IPs assigned?
if that's not possible, is it possible to have devices prefer the DHCPv6 IPs?

hm
if I set AdvPreferredLifetime to 0 for the SLAAC prefix then it can still be used but other addresses will be preferred for new connections, right?
so, I configure radvd to advertise an autonomous prefix and stateful DHCPv6, set AdvPreferredLifetime to 0 for the autonomous prefix, and set up a DHCPv6 server like normal
that way all devices will get a SLAAC address, and most devices will get a DHCPv6 address, but devices with both will use the DHCPv6 address

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