DNS Redundancy After a Disaster

[Stephane Bortzmeyer]

On Mon, Jan 23, 2006 at 08:41:06PM -0600,
 Martin McCormick <martin at dc.cis.okstate.edu> wrote 
 a message of 30 lines which said:

> 	One obvious solution is to install a slave in a nearby town
> which will quietly mirror all the updates to all our zones

Yes, this is the proper solution.

> Other than not being able to dynamically update one's zones, how bad
> does service get if the master is dead and the only working DNS is
> an off-site slave?

No problem. The DNS clients cannot tell the difference between a
master and a slave. 

If you think about big disasters (volcanoes, tsunami, etc), pay
attention to the Expire field of the SOA: if it is too low, you will
not have the time to bring the master back on line (but you could
manually switch the off-site slave to master).