several master ip's for a slave zone

Lyle Giese lyle at
Sat Nov 5 13:29:35 UTC 2011

On 11/05/11 03:21, kalpesh varyani wrote:
> How does this feature address the risk that data provided by one master
> might get overwritten by another?
> Regards,
> Kalpesh
> On Fri, Nov 4, 2011 at 4:08 AM, Anand Buddhdev <anandb at
> <mailto:anandb at>> wrote:
>     On 03/11/2011 23:14, hugo hugoo wrote:
>     Hi Hugo,
>      > I have seen that for a slave zone, it is possible to configure
>     several master IP's.
>      > Why this possibility?
>      > How does it works if several master zone can be used for the zone
>     transfer?
>     This allows for resiliency. In case one of the master servers is
>     unreachable, BIND can try the next master in the list.
>     Anand Buddhdev
>     RIPE NCC
>     _______________________________________________

When you have more than one master, the serial number is used to 
determine which Master has the most current version of the zone by the 
slaves.  The slaves actually ask for the SOA record from each Master 
when refreshing.

Lyle Giese
LCR Computer Services, Inc.

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