Simon Hobson dhcp1 at thehobsons.co.uk
Thu Oct 29 15:42:58 UTC 2009

Glen R. J. Neff wrote:

>>>can the DHCP update the slave zone ? (stupid question sorry)
>>No. And in general, you can't anyway (that's not a DHCP limitation, 
>>it's a limitation of at least one of the major DNS implementations, 
>>and I assume others). It is a definite possibility to create a 
>>database system that allows updates to a slave when the master is 
>>down - but you've only to look at the way failover works in DHCP to 
>>see how quickly the complications build up when you take all the 
>>corner cases into consideration. Not least of these complications 
>>is how to merge two sets of updates - considering it's possible to 
>>have mutually incompatible updates to apply.
>ISC-bind can quite easily be configured to allow DDNS updates to 
>"slave" servers for a zone.  You use the allow-update-forwarding{}; 
>option in the zone declaration on the slave and specify the slave 
>server IPs in with the allow-update{}; statement in the zone 
>declaration on the master.

While the master is down ?

Simon Hobson

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