Ip6hint support to get a static prefix which openwrt already supported

  • ip6hint: Subprefix ID to be used if available (e.g. 1234 with an ip6assign of 64 will assign prefixes of the form …:1234::/64 or given LAN ports, LAN & LAN2, and a prefix delegation of /56, use ip6hint of 00 and 80 which would give prefixes of LAN …:xx00::/64 and LAN2 …:xx80::/64)
    ip6assign and / or ip6hint settings might be ignored if the desired subprefix cannot be assigned. In this case, the system will first try to assign a prefix with the same length but different subprefix-ID. If this fails as well, the prefix length is reduced until the assignment can be satisfied. If ip6hint is not set, an arbitrary ID will be chosen. Setting the ip6assign parameter to a value < 64 will allow the DHCPv6-server to hand out all but the first /64 via DHCPv6-Prefix Delegation to downstream routers on the interface. If ip6hint is not suitable for the given ip6assign , it will be rounded down to the nearest possible value.

https://openwrt.org/docs/guide-user/network/ipv6/configuration

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