IN-ADDR.ARPA Zone Delegations

[Merton Campbell Crockett]

What is a proper method of delegating IN-ADDR.ARPA zones?

To delegate subdomains of a domain, I have created zone files like  
the following.

	1.160.10.10.IN-ADDR.ARPA	PTR record for NS.SUB.DOMAIN.COM
	NS.SUB.DOMAIN.COM		A record for NS.SUB.DOMAIN.COM

This allowed me to override the contents of the 10.10.IN-ADDR.ARPA  
domain and define forward zones whilst transitioning parts of our  
organisation from Microsoft to ISC DNS.

The master name server's configuration file defined 10.10.IN- 
ADDR.ARPA as a slave zone, the 1.160.10.10.IN-ADDR.ARPA as a master  
zone, and 160.10.10.IN-ADDR and 161.10.10.IN-ADDR.ARPA as forward  
zones.  The result of this configuration was that the master name  
server would ignore the data obtained from the Microsoft DNS server  
for the IN-ADDR.ARPA subdomains delegated to NS.SUB.DOMAIN.COM.

The transition is nearing completion and I want to make the master  
name server the primary name server for 10.10.IN-ADDR.ARPA.   
Unfortunately when I do this, the master name server stops forwarding  
requests to NS.SUB.DOMAIN.COM and returns NXDOMAIN.  Not exactly what  
I had intended. :)

I'm sure its a trivial oversight on my part; however, I would  
appreciate any pointers that might help me resolve this problem.

Merton Campbell Crockett
m.c.crockett at adelphia.net