[dns-operations] Surprising behaviour by certain authoritative name servers

[Niall O'Reilly]

On 7 Jan 2020, at 12:53, Greg Choules wrote:

> I don't think it's a protocol violation,

I think that's arguable. RFC1035, section 6.1.3:

  Both the TTL data for RRs and the timing data for refreshing activities
  depends on 32 bit timers in units of seconds.  Inside the database,
  refresh timers and TTLs for cached data conceptually "count down", while
  data in the zone stays with constant TTLs.

Hmm ...