From nobody Fri Jun 14 20:54:10 2024
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From: "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net>
Message-Id: <202406142054.45EKsARM050540@gndrsh.dnsmgr.net>
Subject: Re: 14.1-R rc.conf/ifconfig netmask issue was really hard to figure
 out
In-Reply-To: <svc4gl2frqb6grd4wcdsgbixmk3pwqeju67ryshaumlgax54ms@ooa3sw36j6n4>
To: Mathieu Arnold <mat@freebsd.org>
Date: Fri, 14 Jun 2024 13:54:10 -0700 (PDT)
CC: "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net>,
        Lowell Gilbert <freebsd-current-local@be-well.ilk.org>,
        Poul-Henning Kamp <phk@phk.freebsd.dk>,
        Michael Gmelin <grembo@freebsd.org>,
        Ronald Klop <ronald-lists@klop.ws>, current@freebsd.org
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> On Fri, Jun 14, 2024 at 06:42:09AM GMT, Rodney W. Grimes wrote:
> > > "Poul-Henning Kamp" <phk@phk.freebsd.dk> writes:
> > > 
> > > > Defaulting to a /8 netmask for 192.168.x.y does not make *any* sense ever.
> > > 
> > > Well, not in the last 30 years or so, anyway.
> > 
> > No, never ever did /8 make since on 192.*.*.*, that has always been
> > class C address space.
> 
> I think what Poul-Henning meant is that 31 years ago, in 1993, classless
> inter-domain routing (CIDR) was introduced by the IETF, and it rendered
> "class"es of ip addresses obsoletes.
> 
> So, class C address spaces has been dead for 31 years :-)

NO!  That is an incorrect interpretation of what CIDR does, CIDR did
NOT remove the Class A/B/C applied to address space, it simply added
functionality (supernetting and subnetting) of the A/B/C space that
allows you to do things DIFFERENT than the default /8 /16 and /24
bit prefix length that classfull addresses implied.

> -- 
> Mathieu Arnold
-- 
Rod Grimes                                                 rgrimes@freebsd.org