Thank you Bob for your answer.I continued to search and saw rfc1912 page 4It's
much higher than I first thought
Le mercredi 3 janvier 2018 à 20:05:57 UTC+1, Bob Harold
<rharo...@umich.edu> a écrit :
On Wed, Jan 3, 2018 at 1:57 PM, Mik J via bind-users <bind-users@lists.isc.org>
wrote:
Hello,
I would like to have your thoughts about what should be the best values for
refresh, retry, expire and negative cache.
In my case I have 2 DNS which are hosted in 2 different locations. These
location are near one another (100km). The latency is very low and packet is
0.I configured a lot of zones on my DNS and they not master for someone
else.This is a very simple setup in termes of master/slave.
I would be tempted to* configure a high refresh period since I have notify
configured on the master. What about 7200s ?* Configure a high retry period
because I don't expect the master to be offline, what about 3600 ?* configure a
expire very high like 2 days so that the DNS service would work even if the
master is down* I don't have any opinion about the negative ttl yet but any
advices are welcomed.
What about your setups if it looks like mine ?
Regards
I typically use an expire time of 14 days or a month. But that said, you need
some way to get notified that zone transfers are failing.The refresh and retry
are ok, but personally I would set them lower because they don't generate a lot
of traffic, and a notify could get lost. It depends on how sensitive you are
to extra traffic.
Negative TTL depends partly on how fast you want new (or accidentally deleted)
records to be usable. I use 10 minutes.
-- Bob Harold
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