Re: several master ip's for a slave zone

From	Chris Thompson <cet1@cam.ac.uk>
Newsgroups	comp.protocols.dns.bind
Subject	Re: several master ip's for a slave zone
Date	2011-11-06 23:20 +0000
Message-ID	<mailman.1.1320621651.68562.bind-users@lists.isc.org> (permalink)
References	<DUB109-W63AB421DA9C4CE02A96C8ACD50@phx.gbl> <4EB317F9.9010808@ripe.net> <CAAWTBVx4J5GpxkvE-SyvAiCcW-EyXzgcCVut0tMZv9uE2yG6Gw@mail.gmail.com> <4EB533E8.3000101@clegg.com>

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On Nov 5 2011, Alan Clegg wrote:

>On 11/5/2011 4:21 AM, kalpesh varyani wrote:
>> How does this feature address the risk that data provided by one master
>> might get overwritten by another?
>
>The use of the word "masters" in the configuration of a slave zone is a
>bit misleading.  Under most circumstances, you list the authoritative
>servers, not "multiple masters".

Although Alan doesn't say so, this might suggest to some that you should
list *all* the authoritative servers. That's a very bad idea - you need
to arrange that the directed graph of "A can fetch from B" is acyclic.
Otherwise servers can get into the state that A thinks its copy of the
zone is up to date because B told it so, and B thinks so because A told
it so (or longer loops, of course), while neither of them are true masters
for it.

-- 
Chris Thompson
Email: cet1@cam.ac.uk

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Re: several master ip's for a slave zone Chris Thompson <cet1@cam.ac.uk> - 2011-11-06 23:20 +0000
  Re: several master ip's for a slave zone Barry Margolin <barmar@alum.mit.edu> - 2011-11-06 22:54 -0500
  Re: several master ip's for a slave zone Mark Andrews <marka@isc.org> - 2011-11-07 15:09 +1100
    Re: several master ip's for a slave zone Barry Margolin <barmar@alum.mit.edu> - 2011-11-07 21:03 -0500

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