achieving failover with 2 primary name servers?

[David Botham]

bind-users-bounce at isc.org wrote on 10/20/2003 03:08:06 AM:
> Hi All,
> 
> Trying to achieve a simple failover, I think of the following:
> Have 2 dns servers for my domain at the registrar.
> Both would act as a primary server for the domain.
> DNS1 will answer requests, and delegate www.domain.com to first ip -
> which is hosted on the same box as DNS1.
> DNS2 will answer requests, and delegate www.domain.com to second ip 
> - which is hosted on the same box as DNS2.
> 
> The rational is that if a resolver can't reach any of the DNS 
> servers (either DNS1 or DNS2), it's most likely won't be able to 
> reach the ip's that are hosted on box1 and box2 respectively as 
> well, due to a box failure.
> So I assume that in case of a failover scenario, box1 will not be 
> reached- therefor, the client resolver will try DNS2, which will 
> reply with the ip of the apache placed on box2- and that's how a 
> failover will be achieved.

This process is similar to the one that is outlined in RadWare's DNS 
Whitepaper.  Check it out, however, be warned, their process screws a 
couple of things up, like missing NS RR's and such.  You will probably see 
what I am talking about after you read the doc.  It might help though...

Dave...

> 
> The only drawback I can think of is that a zones would have to be 
> transfered manualy, when a zone is changed, but sine i change the 
> zones rarely, it's not that much of a hassle.
> Can anyone point other issues? Will it even work?
> 
> Thanks!
> 
> 
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