[dns-operations] The Use of TTL for IPv4 and IPv6 RRs...

Mark Jeftovic markjr at easydns.com
Tue May 3 15:42:18 UTC 2016

RFC4472 talks about this situation:

example.com.        300    IN    MX     foo.example.com.
      foo.example.com.    300    IN    A
      foo.example.com.    100    IN    AAAA   2001:db8::1

and what can happen.

My first reaction was "so keep the TTLs the same then", but that doesn't
guarantee that the A and AAAA RRs will get queried and cached by the
resolver at the same time time, does it?

So even if you do that, you can still run into the situations described
in 4.4.1 and 4.4.2


- mark

Mark Jeftovic, Founder & CEO, easyDNS Technologies Inc.
Company Website: http://easydns.com
Read my blog: http://markable.com
+1-416-535-8672 ext 225

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