Bind9 - Reverse net /20 mask 255.255.240.0

[Mark Andrews]

> Hello? I doubt with a setup for Reverse to
> The networks contracted to the AS, here is the problem and attitudes held,
> 
> 
> I would like obtain information where to set the bind9 to do the reverse of a
>  network
> /20 mask 255.255.240.0 and

	Just set up the 16 reverse zones that make up the /20.

> /18 mask 255.255.192.0 

	Just set up the 4 reverse zones that make up the /18.
	
	RFC 2317 is for /25 - /32.  It was designed to alleviate the
	need to create up to 128 zones, along with their delegations,
	which each of which was like:

	@ SOA <soa details>
	@ NS  <server1>
	@ NS  <server2>
	@ PTR <name>

	RFC 2317 gives you 1 zone for up to 128 hosts rather than
	1 zone per host.

	For /17-/24 you have 1 zone per 256 hosts with traditional
	delegation.

	For /9-/16 you have 1 zone per 65536 hosts with traditional
	delegation.

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