What would be happen if one of two dns was down?

[Chris Buxton]

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For the Internet, ns1 going down should cause all resolvers to switch  
over to ns2. This should happen automatically, with the only result  
being a slight slowdown of resolution for a very small fraction of  
your web visitors, ftp users, etc.

Of course, if ns2 is at all flakey, you're in trouble.

For local users, the picture may be different, depending on your  
resolving architecture. Stub resolvers don't handle failures well, so  
if users are hitting your authoritative servers directly, having ns1  
go down could easily be a problem.

Chris Buxton
Professional Services
Men & Mice

On Aug 9, 2008, at 12:43 AM, MontyRee wrote:

>
> Hello, all.
>
>
> I have operated two dns(primary and secondary) for one domain like  
> below.
>
>
> example.com    IN       NS        ns1.example.com
> example.com    IN       NS        ns2.example.com
>
>
> and there was a event that ns1.example.com dns was down.
> As I know, if ns1 dns is down, all requests go to the ns2.example.com.
>
> But  when ns1.example.com dns was down, actually some people can't  
> lookup the domain.
>
> What's the problem and how can I solve this problem?
>
> If I adding some dns server like ns3,ns4.ns5, it would be helpful to  
> solve this problem?
>
>
> Thanks.
>
>
> Regards.
>
>
>
>
>
>
>
>
>
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