Date: Fri, 27 Jun 2003 10:31:59 -0700 From: Bill Campbell <freebsd@celestial.com> To: freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: Two DNS servers with one IP address Message-ID: <20030627103159.A24614@barryg.mi.celestial.com> In-Reply-To: <20030627063449.GA9527@users.munk.nu>; from jez.hancock@munk.nu on Fri, Jun 27, 2003 at 07:34:49AM %2B0100 References: <00c101c3353c$4ecbe100$0100a8c0@ibacsoft.dynu.com> <20030626080930.GA24416@kyblik.pieskovisko.sk> <3EFAAE2C.1000509@attbi.com> <00e801c33c07$3e920360$0100a8c0@ibacsoft.dynu.com> <20030627063449.GA9527@users.munk.nu>
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On Fri, Jun 27, 2003 at 07:34:49AM +0100, Jez Hancock wrote: ... >Can anyone confirm that it's no longer a requisite to provide 2 >distinct DNS servers for a domain you register? I say no longer >because as I understand it there was a time when 2 distinct nameservers >were required... Not having multiple servers may be OK for vanity domains, but certainly isn't advisable if one wants reliable DNS. It's a Good Idea(tm) to have secondary servers geographically separated so that local problems don't take out all the DNS for a domain (e.g. earthquakes, floods, etc.). One of the more amusing examples of this occurred within the last two years when all of Microsoft's DNS failed. M$ had multiple servers all right, but they were all on the same class C network so a routing problem brought them all down. Similar reasoning applies to having multiple MX (Mail eXchange) servers for a domain. Backup MX servers get a bit more complicated though if one is doing any spam blocking as all the backup servers have to have at least as restrictive rules as the primary or the spammers just get to you through the back door. >Also, in the case an admin has only one auth nameserver for a domain but >a registrar _requires_ you list two, what is the best strategy for >listing the second nameserver? Is there any way to avoid using a third >party DNS provider as your secondary nameserver (providing some sort of >dummy listing)? Do you have local user groups, ISPs, or businesses that run DNS servers that would provide backups? We provide backup DNS for most of our customers including some fairly large regional ISPs with hundreds of domains. It's frequently possible to set up reciprocal deals with others. Bill -- INTERNET: bill@Celestial.COM Bill Campbell; Celestial Software LLC UUCP: camco!bill PO Box 820; 6641 E. Mercer Way FAX: (206) 232-9186 Mercer Island, WA 98040-0820; (206) 236-1676 URL: http://www.celestial.com/ The is no worse tyranny than to force a man to pay for what he does not want merely because you think it would be good for him. -- Robert Heinlein
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