Date: Sat, 20 Feb 1999 14:40:04 -0500 (EST) From: hometeam <hometeam@techpower.net> To: Dan Langille <junkmale@xtra.co.nz> Cc: Namodn ROOT <root@namodn.com>, dan@wolf.com, freebsd-questions@FreeBSD.ORG Subject: Re: off-site secondary DNS Message-ID: <Pine.BSF.4.05.9902201439250.8418-100000@techpower.net> In-Reply-To: <19990220192615.GHON682101.mta1-rme@wocker>
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wouldn't these be a bit better?
86400 ; Refresh
21600 ; Retry
604800 ; Expire
86400) ; Minimum TTL
On Sun, 21 Feb 1999, Dan Langille wrote:
> 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
> http://www.FreeBSDDiary.com/freebsd
>
>
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