On 2/18/2013 23:20, Matus UHLAR - fantomas wrote:
On 19.02.13 10:25, Noel Butler wrote:
One thing I need to point out, your SOA timings seem extreme...
refresh 86400 drop that to 3h
retry 3600, drop to 900
I don't see the reason for doing these, unless NOTIFY does not work,
but in
such case it's the NOTIFY that should be fixed...
I agree in principle. However, the costs of having a low refresh
probably aren't that significant, whereas all it takes for a NOTIFY to
get missed is a packet or three getting dropped, and having zones out of
sync might be more significant.
Or, put another way, dropping REFRESH from 24 hours to 3 hours is what,
an additional 8 DNS queries per zone, per secondary, per day? Unless
your zones normally receive only a few hundred queries a day, these
numbers are so trivial that they probably don't matter, whereas having
your secondaries return out of date responses is potentially more annoying.
Retry too seems like a good candidate to keep very low since it only
applies when there is a problem.
But in an ideal world, we've probably just spent more time talking about
it than will result in any savings from tweaking these numbers.
--
Dave Warren
http://www.hireahit.com/
http://ca.linkedin.com/in/davejwarren
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