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charlzmike

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More Than 2 DNS Servers?

I would like to ask what is the benefit of having more than 2 dns servers. We have dedicated server RHL 7.3 and we set it up as a dns server having ns1 and ns2 but my boss ask me if we could add additional nameservers as other company have. From where can i get the additional dns servers so that i will ahve a total of 4 ns. Should i get this with the same Dedicated server provider or should i get it anywhere else.. i heard that there is also something like public DNS, is that safe to use? Thanks Guys for your experties!!!

Regards,
Charlzmike
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0xca

Well,

    You can have your ISP's nameservers slave off one of your authoritative nameservers, your ns1 for example, as well as have people like UltraDNS slave off of ns1.   You can setup your ns2 on a separate network ( say if you're colocated at an NSP, etc ) and list your ISPs nameservers, UltraDNS and your colocated ns2 as authoritative in the root servers.    

   The benefit of having multiple authoritative nameservers is  it buys you redundancy network-wise for external queries and in the case I've outlined above also limits changes to be pushed from your ns1, which you would just use for internal queries and for pushing out DNS changes to your listed authoritative servers via zone transfers or some other means.

    So, use your ISP's nameservers ( since they own the IP blocks you use anyway ).. most are pretty flexible about how they'll do things ( even RFC 2317 Classless IN-ADDR.ARPA delegation if need be ), use people like UltraDNS and generally use any internal resources you have to home a nameserver on as well for redundant purposes.

     It sounds complex, but it really isn't.   Any NSP and companies like UltraDNS should be able to walk you through different scenarios that would work for you ( or a consultant like me! :) )

Good luck,

.0xca
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jlevie

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Doh,

   I think you allocated the accepted answer incorrectly.   At the very least it should be split.    No worries though, good luck with your DNS efforts ;)


.0xca