Date: Mon, 15 Jan 2001 09:59:10 +0100 From: Len Conrad <LConrad@Go2France.com> To: freebsd-isp@freebsd.org Subject: Re: DNS redundancy & load balancing Message-ID: <5.0.2.1.0.20010115095305.02352ec0@mail.Go2France.com> In-Reply-To: <NEBBJFIIGKGLPEBIJACLKEJDCMAA.davew@sai.co.za>
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>We have a primary & secondary DNS server on our local network. >We need some utility or setup that will automatically allow our secondary >DNS to totally take over from our primary DNS in the event our primary DNS >goes down. > >This means effectively that that in the event of a primary DNS failure our >secondary DNS must be able to change it's own IP address to that of the dead >primary DNS server and take over all resolution etc. If both DNS's are in the delegation data for a zone, then the standard query behavior of resolvers and other DNS's will query all delegated DNS's until they get a response. To "DNS clients", there is not a primary or secondary DNS for a zone, all its NS records. Losing one of two NS's is not fatal, and will only slow 50% of the queries that will timeout before trying the other DNS. Load sharing among all DNS's for a zone is already acomplished by DNS altering the physical order of NS records for each query. Len http://BIND8NT.MEIway.com : Binary for ISC BIND 8.2.3 T9B for NT4 & W2K http://IMGate.MEIway.com : Build free, hi-perf, anti-spam mail gateways To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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