[dns-operations] The Use of TTL for IPv4 and IPv6 RRs...
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 192.0.2.1
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 Jeftovic, Founder & CEO, easyDNS Technologies Inc.
Company Website: http://easydns.com
Read my blog: http://markable.com
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