[solved] Stale DHCPv6 leases under Network -> DHCP and DNS

In addition to the accepted solution and as a quick recap for myself and other future readers:

  • double-check that the dhcp negotiation actually works, especially if you have a firewall
  • the client may cache an existing lease and prefer using it until expiration, rather than accept your new static lease candidate
  • Android (SLAAC-only hosts) need a "config domain" entry with the MAC-derived address: you must manually create it, since it is not automatically created from the existing "config dhcp" entry for IPV4 static leases

Thanks to all who contributed.

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