Re: DNS Refresh Interval
From: Kevin D. Goodknecht [MVP] (admin_at_nospam.WFTX.US)
Date: 05/26/04
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Date: Wed, 26 May 2004 08:21:20 -0500
In news:OvkJu9xQEHA.2468@TK2MSFTNGP11.phx.gbl,
SteveK <steve(removethis)@kitley.com> posted a question
Then Kevin replied below:
> Hello,
>
> we have to set refresh intervals for dynamic registration on our DNS
> servers,
Are you referring to the refresh value on the SOA Tab?
This value determines how often secondary/slave nameservers check with the
master for updates.
If you don't have a Secondary zone anywhere, you don't need to change the
value or even worry about it.
That said, RFC1912 2.2 recommends a value between 1200 to 43200 seconds (20
minutes to 12 hours).
>
> has anyone see or know of standards that we should use for that, ie,
> every 1 hour.. 4 hours .. 8 hours.
If you are using zones stored in Active Directory on all DNS server's
replication is done through AD replication, the replication cycle in AD
Sites & Services, through NTDS settings. I'm not sure of the default value
but you have a choice of none, once per hour, twice per hour and four times
per hour.
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