[strenholme]

We mostly got DNS servers to answer AAAA?

That's the sense I get. Back in early 2011, there was still an issue where crappy DNS servers would sometimes respond to AAAA record requests with a "Server fail" error. Because of this, I had to tweak my recursive DNS server to treat a server fail to an AAAA request as if the AAAA record did not exist. This made IPv6 resolution more fragile, but it had to be done because of the state of the internet in early 2011.

I finally removed that "feature" here in 2022, when someone asked why I handled server fail responses to AAAA requests in this unusual manner.