Turn on QNAME minimisation for adb name fetches.
We are still leaking nameserver lookups to the root and TLD servers. This provides those servers with deeper insight as to the nature of the original request when there are cross TLD lookups of nameserver addresses. This should also reduce the number of queries being made in the same situation. Rather than 2xN queries being made (A + AAAA per server) there should be 1 NS query being made.
An example of the address lookups being sent to the root servers.
11:06:10.858943 IP6 2001:470:a001:4:573:3aea:129e:419f.58354 > 2001:7fd::1.53: 14013 [1au] NS? . (40)
11:06:10.859137 IP6 2001:470:a001:4:573:3aea:129e:419f.58822 > 2001:7fd::1.53: 12866 [1au] NS? net. (44)
11:06:11.299990 IP6 2001:7fd::1.53 > 2001:470:a001:4:573:3aea:129e:419f.58354: 14013*- 14/0/27 NS a.root-servers.net., NS b.root-servers.net., NS c.root-servers.net., NS d.root-servers.net., NS e.root-servers.net., NS f.root-servers.net., NS g.root-servers.net., NS h.root-servers.net., NS i.root-servers.net., NS j.root-servers.net., NS k.root-servers.net., NS l.root-servers.net., NS m.root-servers.net., RRSIG (1097)
11:06:11.299991 IP6 2001:7fd::1.53 > 2001:470:a001:4:573:3aea:129e:419f.58822: 12866- 0/15/27 (1160)
11:06:11.305105 IP6 2001:470:a001:4:573:3aea:129e:419f.52460 > 2001:502:8cc::30.53: 43058 [1au] NS? yoqu.net. (49)
11:06:11.305370 IP6 2001:470:a001:4:573:3aea:129e:419f.51203 > 2001:500:1::53.53: 15187 [1au] DNSKEY? . (40)
11:06:11.551042 IP6 2001:502:8cc::30.53 > 2001:470:a001:4:573:3aea:129e:419f.52460: 43058- 0/6/1 (637)
11:06:11.554092 IP6 2001:470:a001:4:573:3aea:129e:419f.51189 > 2001:500:1::53.53: 46962% [1au] A? dns21.hichina.com. (58)
11:06:11.554192 IP6 2001:470:a001:4:573:3aea:129e:419f.52301 > 2001:500:1::53.53: 384% [1au] AAAA? dns21.hichina.com. (58)
11:06:11.555007 IP6 2001:470:a001:4:573:3aea:129e:419f.55708 > 2001:500:1::53.53: 36175% [1au] A? dns22.hichina.com. (58)
11:06:11.555149 IP6 2001:470:a001:4:573:3aea:129e:419f.50339 > 2001:500:1::53.53: 41936% [1au] AAAA? dns22.hichina.com. (58)