Chaining NOTIFY and slave servers - is it supported?
anandb at ripe.net
Tue Apr 21 15:18:57 UTC 2020
On 21/04/2020 17:05, Petr Bena wrote:
> So when someone changes zone on A via nsupdate, NOTIFY and subsequent
> IXFR goes like this: A -> B -> C instead of:
This is just fine. There are many DNs setups organised like this. Your
configuration isn't unique or strange.
> What confuses me however, is that I just found this in BIND
> documentation at:
> "The *also-notify* statement is relevant only with master zones..."
> If also-notify works only with master zones, then why this works? Is it
> even supposed to work? Is this a supported configuration at all?
The terms "master" and "slave" are relative, and bear no relation to how
a server loads a zone (from a file, XFR, database, etc). Any server that
provides XFR to another is a master, and the receiver of such an XFR is
In your case, the "B" server is both a slave (of A), and a master (to
C). Nothing wrong with this.
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