Yeah it arbitrarily tries to ensure that the DNS system has some degree of
robustness. You're still free to screw it up, though.
Wouldn't multiple name servers loadbalanced at the same IP address
effectively be a single server? Logically, it would seem so. You still
have no protection for network failures.
I'll bet the reasoning behind the requirement also has something to do with
the way most DNS resolvers operate. If a query fails at one name server,
the resolver tries another. Placing multiple name servers at the same IP
address would defeat this behavior. It would be foolish (and inefficient)
for a resolver to keep querying name servers at the same IP address in the
hopes that a name server is going to magically start working at that
address.
Why not run two ip addresses on the same box and have the name server answer
to either? Since you don't care about fault tolerance, this would be one
solution.
Jim
----- Original Message -----
From: "tc lewis" <[EMAIL PROTECTED]>
To: "Lynn W. Taylor" <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Friday, May 25, 2001 6:20 PM
Subject: RE: 2+ nameservers sharing 1 ip?
>
> that reason is flawed. i think we all know that the whole "you should
> have 2 nameservers in different geographic locations for fail purposes"
> ideal is often swept under the carpet.
>
> nsi shouldn't care about my fault tolerance; that's my concern.
>
> there are plenty of ways to network balance 1 ip.
>
> now we're back to there being 0 technical reasons. it's an arbitrary
> restriction network solutions has made and is ignorantly enforcing.
>
> -tcl.
>
>
> On Fri, 25 May 2001, Lynn W. Taylor wrote:
>
> > Sorry for the cross-post, but please post to one list only.
> >
> > The reason you have two name servers is so that you can turn one off and
> > still have one.
> >
> > Ideally, they'll be widely seperated so that there is no single point of
> > failure that will shut both of them down.
> >
> > I don't know how to do that with just one IP.
> >
> > -----Original Message-----
> > From: tc lewis
> > Sent: Friday, May 25, 2001 4:25 PM
> > To: Jackie Fong
> > Cc: INTERNET@BCN {[EMAIL PROTECTED]}; INTERNET@BCN
> > {[EMAIL PROTECTED]}
> > Subject: RE: 2+ nameservers sharing 1 ip?
> >
> > how is it not legal?
> >
> > while irrelevant, one of the reasons is so all the domains i have using
> > nameserver x and nameserver y are effectively both using nameserver x.
> > they already are -- i don't see the need to waste ip space and various
> > other resources.
> >
> > -tcl.
> >
> >
> > On Fri, 25 May 2001, Jackie Fong wrote:
> >
> > > tcl,
> > >
> > > I don't think it's 'legal' to have two nameservers with the same IP.
Why
> > > do you want to do that anyway? I don't see any reasons to do this...
> > >
> > > > the manage client interface (action=manage_nameserversmeservers)
doesn't
> > > > seem to allow me to create 2 nameservers with the same ip:
> > > >
> > > > Unable to create nameserver: Registry error, nameserver creation
failed
> > > > [Attribute value not unique]
> > > >
> > > > is there any technical reason for this? is this just an extra step
of
> > > > user error prevention? any way to get around it?
> > > >
> > > > -tcl.
