[118259] in North American Network Operators' Group
Re: ISP customer assignments - and CIDR
daemon@ATHENA.MIT.EDU (James R. Cutler)
Fri Oct 16 17:46:02 2009
From: "James R. Cutler" <james.cutler@consultant.com>
In-Reply-To: <2C964F6B-9ADE-4AD8-9C1F-2542EC85C79D@delong.com>
Date: Fri, 16 Oct 2009 17:44:59 -0400
To: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Oct 16, 2009, at 5:19 PM, Owen DeLong wrote:
> I've taught both. If you try to teach it in Decimal, Hex, or Octal,
> you're right, it's hard
> to teach CIDR and easy to teach classful.
It really does not matter the representation as long as you divide
your Address Pie with a Binary Knife. Once you understand that --
1/2, 1/2 of 1/2, 1/2 of 1/2 of 1/2, ... -- then you should understand
CIDR. Then, as Owen suggests, deal with the representation. Works for
IPv4, IPv6, and, probably, IPv8. ;)
Warning, strong opinion follows: One should never have to mention
Classful addressing except to note that it is archaic, anachronistic,
and used only by those who remain ignorant by preference.
James R. Cutler
james.cutler@consultant.com
