The best values for SOA REFRESH, RETRY, EXPIRE and MINIMUM
Mathias Körber
mathias at koerber.org
Wed Sep 20 12:00:17 UTC 2000
> I'm wondering what the best / recommended values for SOA REFRESH, =
RETRY,
> EXPIRE and MINIMUM are.
>=20
> mine are like this right now:
>=20
> 28800 ; Refresh
> 14400 ; Retry
These look ok.
> 3600000 ; Expire
This equals 41 days and is OK if a bit long. Most people seem to be =
recommending
1 week, while I think 3-4 weeks better, which allows for the (usually =
only knowledgeable admin)
to be away for a while before secondaries expire the domain.
> 864000 ) ; Minimum
Do you mean 86400 (1 day?) or 864000 (10 days)?=20
10 days would definitely be too long, and even 1 day is on the long =
end.
Usually this is set to 1 hour or shorter. If it gets too short, the =
authoritative
servers would not see any benefit from negative caching by foreign =
caching servers.
If it is set too long (2 hours or longer seem excessive), adding names =
which have
already been requested but had been missed in the file could not be =
effective on
short notice. Usually this is in the 10 minutes to 1 hour range with 15 =
to 20 minutes
a good average.
HTH
Mathias
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