Kea DHCP IPv6 not delivered to android smartphones

[lthiry]

Hello,
I switched from legacy isc dhcp to the kea one in latest opnsense version.
I configured DHCP on IPv6. It is working on windows systems which get IP address, but unfortyunately Anbdroid phones do not get any ip v6 address.

2026-04-17T17:38:36Warningkea-dhcp6WARN [kea-dhcp6.alloc-engine.0x41e566477008] ALLOC_ENGINE_V6_ALLOC_FAIL_CLASSES duid=[00:03:00:01:0a:e6:7f:18:8e:6e], [no hwaddr info], tid=0x552fa8: Failed to allocate an IPv6 address for client with classes: ALL, UNKNOWN
2026-04-17T17:38:36Warningkea-dhcp6WARN [kea-dhcp6.alloc-engine.0x41e566477008] ALLOC_ENGINE_V6_ALLOC_FAIL_NO_POOLS duid=[00:03:00:01:0a:e6:7f:18:8e:6e], [no hwaddr info], tid=0x552fa8: no pools were available for the lease allocation
2026-04-17T17:38:36Warningkea-dhcp6WARN [kea-dhcp6.alloc-engine.0x41e566477008] ALLOC_ENGINE_V6_ALLOC_FAIL_SUBNET duid=[00:03:00:01:0a:e6:7f:18:8e:6e], [no hwaddr info], tid=0x552fa8: failed to allocate an IPv6 lease in the subnet 2a01:xxxx:yyyy:zzzz::/64, subnet-id 1, shared network (none)

Thanks

[OPNenthu]

If I'm not mistaken, Android doesn't support DHCPv6.  Not sure if that's changed in recent versions.

[nero355]

I configured DHCP on IPv6.
It is working on windows systems which get IP address, but unfortyunately Anbdroid phones do not get any ip v6 address.

If I'm not mistaken, Android doesn't support DHCPv6. Not sure if that's changed in recent versions.

AFAIK only SLAAC works indeed :)

And mind those timers that were mentioned in another topic some time ago : Wrong timers = Weird results and strange IPv6 issues !!