Configuring different TTLs in multiple RRs for the same domain name, TYPE, and CLASS

Barry Margolin barmar at
Fri Mar 25 14:21:20 UTC 2016

In article <mailman.456.1458889802.73610.bind-users at>,
 Dave Warren <davew at> wrote:

> I'm more interested in the impact from the perspective of an 
> authoritative server operator and in some respects sites that use short 
> TTLs will increase the odds of my longer-TTL's records staying in the 
> cache longer before it gets hit by a cache-size limit, but none of my 
> zones are really large enough to do A/B testing.

IMHO, memory is so cheap these days that any server that has to eject 
cache entries because of memory limits means the server operator isn't 
really trying to do their job well.

Barry Margolin
Arlington, MA

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