From owner-freebsd-isp Mon Apr 17 13:55:23 2000 Delivered-To: freebsd-isp@freebsd.org Received: from verdi.nethelp.no (verdi.nethelp.no [158.36.41.162]) by hub.freebsd.org (Postfix) with SMTP id 97D7637B8E5 for ; Mon, 17 Apr 2000 13:55:19 -0700 (PDT) (envelope-from sthaug@nethelp.no) Received: (qmail 44307 invoked by uid 1001); 17 Apr 2000 20:55:16 +0000 (GMT) To: bv@wjv.com Cc: freebsd-isp@freebsd.org Subject: Re: Failover question/idea/hint From: sthaug@nethelp.no In-Reply-To: Your message of "Mon, 17 Apr 2000 12:25:47 -0400 (EDT)" References: <200004171625.MAA39745@mail.wanlogistics.net> X-Mailer: Mew version 1.05+ on Emacs 19.34.2 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Date: Mon, 17 Apr 2000 22:55:16 +0200 Message-ID: <44305.956004916@verdi.nethelp.no> Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > An old client of mine is bringing up a portal site. They current have > a T1 to their location, but the site is going to be put on a server > at our co-location facility - which is inside an OC-48 connected facility. > > They are going to keep theri T1 and the current site as a development > site, but they want to be able to use that site as a fail-over site > in case the main site goes down. ... > I can't t see that the round-robin DNS approach would work, but if the > primary DNS (located at tha main site) goes down, would that be enough > to force it to the secondary name server - which I'm thinking could > point to the backup site. If by "primary" and "secondary" you mean the normal DNS master and slave servers (this is the current terminology), it won't work: - The master and the slave(s) are supposed to have the *same* data. The slave(s) fetch a copy of the zone data from the master. - The "rest of the world" do not differentiate between master and slave name servers - all they do is choose one of the *authoritative* name servers. Master and slave(s) are all supposed to be authoritative, of course. To put it another way: As seen from the outside, there is no difference between "primary" and "secondary" name servers! Steinar Haug, Nethelp consulting, sthaug@nethelp.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message