Date: Fri, 14 Jun 2024 13:54:10 -0700 (PDT) From: "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net> To: Mathieu Arnold <mat@freebsd.org> 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 Subject: Re: 14.1-R rc.conf/ifconfig netmask issue was really hard to figure out Message-ID: <202406142054.45EKsARM050540@gndrsh.dnsmgr.net> In-Reply-To: <svc4gl2frqb6grd4wcdsgbixmk3pwqeju67ryshaumlgax54ms@ooa3sw36j6n4>
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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
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