From owner-freebsd-questions Sat Feb 20 11:38:57 1999 Delivered-To: freebsd-questions@freebsd.org Received: from techpower.net (techpower.net [205.133.231.1]) by hub.freebsd.org (Postfix) with ESMTP id CCAA7118D0 for ; Sat, 20 Feb 1999 11:38:30 -0800 (PST) (envelope-from hometeam@techpower.net) Received: from localhost (hometeam@localhost) by techpower.net (8.9.3/8.9.3) with ESMTP id OAA08427; Sat, 20 Feb 1999 14:40:04 -0500 (EST) Date: Sat, 20 Feb 1999 14:40:04 -0500 (EST) From: hometeam To: Dan Langille Cc: Namodn ROOT , dan@wolf.com, freebsd-questions@FreeBSD.ORG Subject: Re: off-site secondary DNS In-Reply-To: <19990220192615.GHON682101.mta1-rme@wocker> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 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 > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message