sneak ec82f97dc7 resolver: try servers in a random order on each resolution (closes #138) ...

Every resolution walked the root servers in a fixed order, so
a.root-servers.net got every first query and its timeouts were paid on
every lookup. Each list of servers the resolver walks is now walked in a
random order from rand.Shuffle, chosen anew each time; a server that does
not reply, refuses, or gives an error reply or a referral that leads no
closer is still passed over for the next. When a referral names a zone's
nameservers without their addresses, all of them are now looked up, not
only the first that resolves, so the zone is not given up because the
first nameserver whose address was found gave no usable reply. No test
fails if the walk stops shuffling: which server a live query reached is
not observable.

Model: opus-5-5

2026-10-02 01:15:16 +00:00

..

livednstest_test.go

tests: rename internal/livedns to livednstest and deny it outside tests (closes #164)

2026-10-01 19:52:48 +02:00

livednstest.go

resolver: try servers in a random order on each resolution (closes #138)

2026-10-02 01:15:16 +00:00