Reverse for a /23

[Mark.Andrews at iengines.com]

> Stephen Amadei <amadei at dandy.net> writes:
> 
> (snip about RFC2317)
> 
> >O.K... I had heard RFC2317 was for doing reverse breaking _any_ of the
> >octets... not just the last one.
> 
> >Then what would be done, for say a /17 reverse?  Create 32768 reverse
> >files?
> 
> No, 128 files with 256 entries each.
> 
> For a /9 you would need 32768 files, though with that many hosts
> you might delegate some of them.

	No.  A /9 is 128 delegations.

	0.xx.in-addr.arpa ... 127.xx.in-addr.arpa.
	or
	128.xx.in-addr.arpa ... 255.xx.in-addr.arpa.

	Mark

> 
> Actually, the RFC2317 method was not originally for subnetting, it was
> when I had a few addresses on the campus backbone and wanted to be able
> to do the reverse for them.  It works for any case of delegating less
> than an entire /24, as was said, down to /32 (one host).
> 
> -- glen
> 
--
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