Date: Fri, 21 Aug 1998 23:26:29 -0400 From: Chris Johnson <cjohnson@palomine.net> To: isp@FreeBSD.ORG, jack@germanium.xtalwind.net Subject: Re: [Q] what happens when 1 of N nameservers dies? Message-ID: <19980821232629.A21999@palomine.net> In-Reply-To: <Pine.BSF.4.02.9808211950150.15050-100000@germanium.xtalwind.net>; from jack on Fri, Aug 21, 1998 at 08:04:48PM -0400 References: <199808212326.QAA13587@hub.freebsd.org> <Pine.BSF.4.02.9808211950150.15050-100000@germanium.xtalwind.net>
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On Fri, Aug 21, 1998 at 08:04:48PM -0400, jack wrote: > Looking at a `typical' whois listing :) > > germanium# whois freebsd.org > > [snip] > > Domain servers in listed order: > > WHO.CDROM.COM 204.216.27.3 > NS1.CRL.COM 165.113.1.36 > NS2.CRL.COM 165.113.1.37 > NS1.IAFRICA.COM 196.7.0.139 > NS2.IAFRICA.COM 196.7.142.133 > > WHO.CDROM.COM is configured as the primary server for the domain, > all others are configured as secondary servers. > > When a DNS server at someother.domain wants to find > www.freebsd.org's IP address it will first query WHO.CDROM.COM, > if that fails it will try NS1.CRL.COM, if that also fails it will > try NS2.CRL.COM, if that fails ..... That's not the case. To the outside world, all listed name servers are considered equal -- there's no concept of primary and secondary. Primariness and secondariness matter only to the administrator: a primary is where the data live, and secondaries load their data from a primary. Any listed name server is considered to be as authoritative as any other. In BIND 8.1.x, they're not even called primary and secondary any more -- they're called master and slave, probably to avoid this confusion. In the case of FreeBSD.org, the SOA shows that the primary name server is implode.root.com, which isn't even listed as a name server for the domain. So all of the listed name servers are secondaries (or slaves). Chris To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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