SOA serial increment when we update SOA RR

[Mukund Sivaraman]

On Wed, Oct 04, 2017 at 11:43:18AM +0100, Tony Finch wrote:
> rams <bramesh80 at gmail.com> wrote:
> >
> > When we change any resource record like A or AAAA, then SOA serial number
> > gets incremented. But If we update only SOA record ,Is serial number of SOA
> > remain same as before or serial number of SOA will increment?.
> 
> It needs to increment, yes, because that's how the secondaries know they
> need to update their copies of the zone.
> 
> > Do we have any RFC for this?
> 
> I don't know if this particular case is mentioned explicitly, but you can
> look at RFC 1995 (IXFR) and RFC 5936 (AXFR).

Also please read RFC 1982, specifically section 7 (The DNS SOA serial
number) on what to keep in mind when updating the serial number.

		Mukund