DDNS updates for zone having multiple primary servers

Simon Hobson dhcp1 at thehobsons.co.uk
Thu Apr 1 19:17:24 UTC 2021

Glenn.Satchell at uniq.com.au wrote:

> 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've not seen anything to suggest that has changed.

In the absence of a zone declaration, the primary DNS server is determined by looking at the SOA record for the zone - so without keys setup, a correctly configured DNS setup will automagically get updates as long as updates are allowed (e.g. by IP address). If a zone declaration is present, then the server specified in that is used.


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