Date: Sun, 21 Feb 1999 08:25:52 +1300 From: "Dan Langille" <junkmale@xtra.co.nz> To: Namodn ROOT <root@namodn.com>, dan@wolf.com Cc: freebsd-questions@freebsd.org Subject: Re: off-site secondary DNS Message-ID: <19990220192615.GHON682101.mta1-rme@wocker> In-Reply-To: <19990220075812.A20511@ns.wolf.com> References: <19990220055521.PZWW3226200.mta2-rme@wocker>; from Dan Langille on Sat, Feb 20, 1999 at 06:54:29PM %2B1300
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On 20 Feb 99, at 7:58, dan@wolf.com wrote:
> While my knowledge of the specifics is a bit rusty, I
> seem to recall that that is precisely the reason for
> remembering to implement your serial number each time
> you change zone records on the primary machine. THe
> secondary will poll the primary at predetermined intervals
> (I don't remember *where* it's determined - that's where
> the rust sets in) and determine the current serial
> number. If he (the secondary) doesn't have the current
> version of the data he'll automatically initiate a
> named-xfer to get the current records.
>
> Of course, this assumes that you can afford to wait
> for the secondary to get around to checking currency
> of his data...
Ahh yes, this is correct. I was missing this point. I thought the poster
was trying to modify the primary and get that to refresh the boot records.
Most people now use a serial number of the form YYYYMMDDHHMM. And the
refresh rate determines how often the secondary will check the primary for
a more recent serial number. Here's an example of these values from my
website:
@ IN SOA mydomain.com. root.freebsd.mydomain.com. (
199902210845 ; Serial
3600 ; Refresh
300 ; Retry
3600000 ; Expire
3600 ) ; Minimum
The above shows that I modifed the zone files on 21 Feb 1999 at 08:45.
The secondary will compare that serail value to it's own. If the primary
contains a newer value, the secondary will request a zone transfer. The
secondary will check the primary's serial number every 3600 seconds (every
hour).
Sorry. I really should have said all this the first time.
--
Dan Langille
The FreeBSD Diary
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