Reverse for a /23

[Mark.Andrews at iengines.com]

> On Tue, Dec 21, 1999 at 06:05:51PM -0500, Stephen Amadei wrote:
> > O.K... I haven't been able to get ahold of a up to date Cricket book...
> > (mine is revision 1) and I have read RFC2317... but I am still having
> > nothing but problems doing reverse for a supernet... in this case, a /23.
> > 
> > I am feeling really stupid and need someone to explain this to me step by
> > step... ;-)
> > 
> > I am running BIND 8.1.2 and lets say I am trying to set up reverse for
> > 192.168.218.0/23 (192.168.218.0/24 and 192.168.219.0/24).
> > 
> > I put in my named.conf:
> > 
> > zone "218/23.168.192.in-addr.arpa" {
> > 	type master;
> > 	file "db.192.168.218";
> > };
> > 
> > And I put in db.192.168.218:
> > 
> > 218/23.251.204.in-addr.arpa.	IN SOA ns.our.net someone.our.net (
> > 				1999121701	;Serial
> > 				10800		;Refresh after 3 hours
> > 				3600		;Retry after 1 hour
> > 				604800		;Expire after 1 week
> > 				86400	)	;Minimum TTL of 1 day
> > 
> > 218/23.251.204.in-addr.arpa.	IN NS	ns.our.net.
> > 218/23.251.204.in-addr.arpa.	IN NS	ns2.our.net.
> > 
> > 1.218.251.204.in-addr.arpa.	IN PTR	blah.our.net.
> > 129.218.251.204.in-addr.arpa.	IN PTR	blah2.our.net.
> > 1.219.251.204.in-addr.arpa.	IN PTR	blah3.our.net.
> > 22.219.251.204.in-addr.arpa.	IN PTR	blah4.our.net.
> > 
> > When I HUP BIND, it just gets all upset and drops the whole zone.
> > 
> > Maybe I've read RFC2317 totally wrong, but the bottom line is I'm confused
> > over the whole situation.
> > 
> > 					----Steve
> > Stephen Amadei
> > Systems Admin
> > Dandy.NET
> > Atlantic City, NJ
> 
> More recent versions of DNS are much more strict about what they will
> allow as a domain name.  They will only allow characters in a domain
> name that are also valid in a host name.  So "/" is out.

	BIND happily accepts 1.218/23.251.204.in-addr.arpa as the owner
	of a PTR record.  The problem here was there were out of zone
	records.

	That being said I use a range <start>-<end>.xxx.yyy.zzz.in-addr.arpa
	as it gets around buggy implementations.

	Mark
--
Mark Andrews, Internet Engines Inc. / Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at iengines.com