Banana Flex flex.banana at bluewin.ch
Fri Oct 30 17:41:58 UTC 2009

thank you Glen,

i will try this options next week

have a nice week end

On Oct 29, 2009, at 3:14 PM, Glen R. J. Neff wrote:

> Simon Hobson wrote:
>> Banana Flex wrote:
>>> but how can it work when the master goes down ? no DDNS works at  
>>> this time ?
>> Correct, DDNS stops working.
>>> 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.
> -G
> -- 
> /*
> * Glen R. J. Neff
> * RTP TSG Network Team
> * neff_glen at emc.com
> *
> * EMC^2 == E^2
> */
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