Multi-master scenario

[Barry Margolin]

In article <ctq4po$2ti7$1 at sf1.isc.org>, Phil Dibowitz <phil at ipom.com> 
wrote:

> I'm planning to setup multi-mastering and am looking for comments:
> To increase our redundancy, I'm planning on having another DNS server at
> our DR (Disaster Recovery) site which will be configured as a master.
> All of our slaves will then get both the IP of the current master and
> this new master in its "masters { };" parameter for each one of our zones.
> 
> I then plan on having the automated system that does DNS updates
> configured to update the zonefiles on both servers.
> 
> Now, as I've read the docs, this will all work - the slaves will take
> info from the master with the most recent serial number that responds first.

When a refresh occurs due to the Refresh timer going off, it will check 
each master serially, and pull a transfer from one if it has a higher 
serial number than the local copy.  It doesn't try them both 
concurrently.

> My first question is... notifies. If all the slaves get notifies from
> both masters -- will that cause any problem? Will they get confused? I'm
> assuming they won't try two zone transfers, because they'll do one then
> check the serial.

Right.

-- 
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***