NS records in parent

[Mark_Andrews at isc.org]

> 
> David Mitchell <davem at fdgroup.co.uk> wrote in message
> news:<199908241540.QAA21951 at tiree.fdgroup.co.uk>...
> > If the server for a parent zone is also slave for a child zone,
> > is it still necessary for the parent server to explicity list the
> > name servers of the child zone in the zone file of the parent?
> 
> It's actually not necessary, assuming that the server that's slave for the
> child zone is the primary master for the parent zone.  The NS records from
> the child zone will be automatically "promoted" into delegation information
> in the parent zone.
> 
> Still, it's good practice to duplicate the NS RRs in the parent zone,
> especially if there's any chance of reconfiguring the name server so that
> it's no longer a slave for the child zone, or of moving the primary master
> for the parent zone to another name server.
> 

	Also BIND 9 will *not* automatically promote NS records in AXFR /
	IXFR responses.

	You should add them in BOTH places and maintain them in BOTH places.

	Mark
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org