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Date:      Mon, 17 Apr 2000 15:06:07 -0400 (EDT)
From:      Jim Sander <jim@federation.addy.com>
To:        bv@wjv.com
Cc:        freebsd-isp@FreeBSD.ORG
Subject:   Re: Failover question/idea/hint
Message-ID:  <Pine.BSF.4.10.10004171456410.24932-100000@federation.addy.com>
In-Reply-To: <200004171625.MAA39745@mail.wanlogistics.net>

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> 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.

   One possible problem is that certain internet hosts set up their
nameservers to querry the secondary server before the primary... at least
one ISP I know of does/did that. Why- I suppose they think it's faster?
(and maybe it is...) Don't know how common it is, but it *does* happen.

   It's not so much a problem as something to keep in mind. In other
words, don't set up their DNS box to serve out IP of the "backup" site
"ahead of time" unless they want synchronization issues and the like. It's
a good strategy, but i don't think it can't be as automatic as one might
like- unless you layer something over it, or do something else.

-=Jim=-



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