[78658] in North American Network Operators' Group

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Re: Delegating /24's from a /19

daemon@ATHENA.MIT.EDU (Robert Blayzor)
Tue Mar 15 15:12:38 2005

Date: Tue, 15 Mar 2005 15:12:10 -0500
From: Robert Blayzor <rblayzor@inoc.net>
To: alex@pilosoft.com
Cc: Mike Sawicki <fifi@HAX.ORG>, nanog@merit.edu
In-Reply-To: <Pine.LNX.4.44.0503151447530.22270-100000@bawx.pilosoft.com>
Errors-To: owner-nanog@merit.edu


alex@pilosoft.com wrote:
> Either by doing DNS delegation on the zone boundary or by SWIP'ing the 
> space to the other company.

You can SWIP it yes, but that won't help DNS on small blocks like /24's.

> It is very easy to do DNS delegation, say if you have 128.0.0.0/19, and 
> you want to delegate 128.0.1.0/24, in your zone file for 
> 0.128.in-addr.arpa zone put 
> 
> 1 IN	NS	ns1.othercompany.com
> 1 IN	NS	ns2.othercompany.com

The only way it will work is to use RFC2317 or slave the zones from the
other name server.  Because he does not have the entire /16 you can't
just delegate like that.

-- 
Robert Blayzor, BOFH
INOC, LLC
rblayzor\@(inoc.net|gmail.com)
PGP: http://www.inoc.net/~dev/
Key fingerprint = 1E02 DABE F989 BC03 3DF5  0E93 8D02 9D0B CB1A A7B0

Sure it's user-friendly...if you know what you're doing.

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