Classless in-adr.arpa zones - & Dynamic Updates

[Evans, Lorne R ISTA:EX]

	Hello:  

	I took a quick peek at both the archives and  RFC 2317 - but came up
empty.  Are there any restrictions on Dynamic Updates of Classless
in-adr.arpa zones?  The W2K MSFT Server Resource Kit doc states:

		"NOTE Dynamic update does not work with classless
in-addr.arpa zones.  If you need to dynamically update PTR resource records,
do not use classless zones".

		I am curious as to whether this is a generic DNS Server
restriction - BIND and W2K DNS Server - or - just a  W2K DNS client / DHCP
Server  restriction.  As well - could somebody possilby provide insight as
to why this might be a restriction?

		Thanks!

				Lorne Evans               
				Network Services, ISTA
				4000 Seymour Place W335
				Victoria, Canada V8X-4S8
				 lorne.evans at gems1.gov.bc.ca
				(250) 387-7877 - 4000 Sey 
				(250) 387-8419  - FAX 
				http://www.ista.gov.bc.ca