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From: Phil Mayers <p.mayers@imperial.ac.uk>
Newsgroups: comp.protocols.dns.bind
Subject: Re: several master ip's for a slave zone
Date: Sun, 06 Nov 2011 10:01:31 +0000
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On 11/05/2011 01:32 PM, Felix New wrote:
> if i have several master servers, whether i must ensure that all the
> master server's serial are the same? i think this is a little complex,
> in particular zone is updated by dynamic update(In such a scenario, the
> serial number is controled by every single bind).

That's a bad architecture (multiple masters with no coordination). Don't 
deploy it.

Either use a single master, or deploy one of the solutions which 
actually makes multi-master work, and coordinates changes and zone serial.

Having said that - you can set the zone serial via dynamic update. Just 
add a SOA record with the required serial.