Is it possible to specify a fallback NS?
barmar at alum.mit.edu
Tue Oct 24 01:14:06 UTC 2006
In article <ehj6so$2g8p$1 at sf1.isc.org>,
linuxnewbie1234 <linuxnewbie1234 at nowhere.com> wrote:
> Suppose I have a company ONE for which I am serving the domain .one.com
> I know the A addresses of a computer like www.one.com
> however my company recently splitted and now there is an independent
> branch, which is two.one.com .
> At TWO-ONE They have their computers (e.g. three.two.one.com), and their
> NS which is ns.two.one.com . All the IP addresses can change without
> them informing me. In addition they can split further and make a
> THREE-ONE branch with the domain three.one.com . TWO-ONE will be
> informed of the split but not me.
> Since I have the top level NS ns.one.com BUT I don't have control on
> what the other people do, is there a way to configure my zone file so
> that for everything of the form X.one.com it first goes looking in my
> zone file and then if this finds nothing, either
> -goes asking recursively to ns.two.one.com OR
> -tells the client to refer to ns.two.one.com
Delegate the subdomain two.one.com to their nameservers.
> Note that I cannot simply put an NS entry specifying X.two.one.com NS
> ns.two.one.com because if they split again forming "three" I wouldn't
> catch that one. I really want a fallback on ns.two.one.com if the
> computer is not found in my zone. Is that possible?
No, it's not possible with BIND.
Why would a branch called TWO be creating another subdomain called
THREE? If the new branch is part of TWO, it should be something like
three.two.one.com -- the DNS hierarchy should mirror the administrative
hierarchy. If it's a new, independent branch, like TWO was, then you
should go through the same process to add it to your DNS hierarchy as
you did when TWO was created.
Barry Margolin, barmar at alum.mit.edu
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