DDNS updates for zone having multiple primary servers

[glenn.satchell at uniq.com.au]

Hi Kraishak

My understanding from a long time ago (as in >5 years) was that that 
dynamic dns updates are only sent to the primary DNS server. The primary 
is expected to forward to all the secondaries.

I think DHCP sends an update to the secondary only when the primary is 
not contactable, and the secondary is expected to forward the update to 
the primary when it comes back online. Either way the DHCP server does 
not directly update any secondaries, that is the job of the primary.

So the bottom line is that it probably doesn't matter if you only list 
one secondary.

regards,
Glenn

On 2021-03-31 18:55, kraishak wrote:
> Hi Glenn,
> Thanks for the reply,
> 
>>> For the zone setting, have you had a look at the dhcpd.conf man page, 
>>> in
> particular the section titled "DYNAMIC DNS UPDATE SECURITY" where it
> explains the syntax and behaviour.
> 
>>> It's not clear whether it is a comma separated list of secondaries,
> ormultiple secondary statements with a single address.
> 
> yes I tried checking in the man pages and document but it is not clear 
> and
> there is no specific note that tells this DDNS updates can be suitable 
> only
> for the zones which have only one primary and one secondary, so I 
> thought of
> checking with dhcp-users if any one tried or having any experience for 
> that
> 
> 
> Thanks
> Kraishak
> 
> 
> 
> 
> --
> Sent from: http://isc-dhcp-users.2343191.n4.nabble.com/
> _______________________________________________
> ISC funds the development of this software with paid support
> subscriptions. Contact us at https://www.isc.org/contact/ for more
> information.
> 
> dhcp-users mailing list
> dhcp-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users