Still tinkering with my Google Fiber IPv6 settings, and noted that my clients (primarily testing with a MacBook Air) get a working IPv6 address. But looking at the network settings, it appears that only the IPv4 DNS servers are being issued to the client via DHCP. However, ping6 from the MacBook does work.
How does the client "know" which IPv6 DNS servers to use? Is there a way to manually issue the IPv6 nameservers I want?
FYI - running this config: