Im trying to use a local dns server... but the IPV6 keeps changing... and i cant set it in the options... My ISP is native IPv6.. thnks

Im trying to use 2 local dns (raspberry) servers. But when the PRIMARY dns is offline, the SECONDARY takes too much time to be queried by the router... I wish we have an option to query both dns...

It is not possible to change between these basic options.   For example, these options are missing: DHCPv6 SLAAC Will future firmwares have more advanced options in ipv6?