Re: Transitioning IETF DNS services

[Brian Dickson <briand at ca.afilias.info>]

Mark Andrews wrote:
> >  	Hello Ray ,
> >
> > On Wed, 12 Dec 2007, Ray Pelletier wrote:
> >     
> > > Will all be changed to the following:
> > >
> > >   NS4.AMSL.COM    64.170.98.30
> > >   NS5.AMSL.COM    64.170.98.31
> > >   NS6.AMSL.COM    2001:5c0:9758::1:1
> > >       
> >  	Fmi ,  Are the preceding name servers physically diverse ?
> >  		Tia ,  Jiml
> >     
>
> 	There has to be common failure points with NS4.AMSL.COM
> 	and NS5.AMSL.COM.  Think route announcements.
>   
Well, yes, of course.

The question that is more critical is, are there any elements which 
aren't common failure points?

If the two IPs are on one physical server, there's very little that 
could fail without taking down both instances.
(E.g. single disk failure, memory failure, NIC, crash/reboot, etc.)

If the two IPs were on different subnets, there would be an expectation 
of physical diversity.
However, the same subnet makes this less certain, thus the OP's question.

Brian

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