On 2016-03-25 07:21, Barry Margolin wrote:
In article <mailman.456.1458889802.73610.bind-us...@lists.isc.org>,
Dave Warren <da...@hireahit.com> 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.
If you're running a dedicated public/ISP/massive-corporation resolver,
sure, this is true. But if your resolver is some random DNS server on a
small corporate Active Directory and one of dozens of services on a
$1000 server with 1-50 users, who cares if your DNS cache only carries 5
minutes, 30 minutes, or 6 hours of cache?
In fact, if your resolver just forwards queries to your ISP, and your
ISP has dedicated caches, there would be very little measurable
difference at all. I'm not a fan of forwarding, but many admins set it
up because it's there without considering whether it's needed or not.
--
Dave Warren
http://www.hireahit.com/
http://ca.linkedin.com/in/davejwarren
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