"Mounting" a zone in two locations

Mark Andrews Mark_Andrews at isc.org
Wed Dec 22 21:57:01 UTC 2004

> I have two domains, A.com and B.com (company went through a name change).
> I want to have a common, dynamically updated subdomain, available as both
> foo.A.com and foo.B.com, such that a nsupdate call adding (or removing) a
> host bar.foo.A.com also immediately impacts any lookups against
> bar.foo.B.com. I don't have any particular need to support nsupdate
> requests attempting to directly update foo.B.com.
> I already have foo.A.com working; however, I'm not quite clear on what the
> correct way to also expose this zone as foo.B.com would be. Any hints on
> how to go about this, or a better way to get the behaviour in question?
> I'm using BIND 9.
> Thanks!

	You can use a "foo.B.com. DNAME foo.A.com".  Requires the servers
	for foo.B.com to know how to handle DNAMES (as BIND 9 does).
	This will may everything below foo.B.com to the same prefix under

	One really needs to ask why you need to add names to foo.B.com
	at all?
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org

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