[157059] in North American Network Operators' Group
Re: IPv4 address length technical design
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Thu Oct 4 14:27:07 2012
To: Johnny Eriksson <bygg@cafax.se>
In-Reply-To: Your message of "Thu, 04 Oct 2012 09:57:34."
<CMM.0.91.0.1349337454.bygg@mail.cafax.se>
From: Valdis.Kletnieks@vt.edu
Date: Thu, 04 Oct 2012 14:25:47 -0400
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Thu, 04 Oct 2012 09:57:34, Johnny Eriksson said:
> Valdis.Kletnieks@vt.edu wrote:
>
> > And the -10s and -20s were the major reason RFCs refer to octets
> > rather than bytes, as they had a rather slippery notion of "byte"
> > (anywhere from 6 to 9 bits, often multiple sizes used *in the
> > same program*).
>
> Not quite correct. Anywhere from 1 to 36 bits, and not spanning
> a 36-bit word boundary. Essentialy what is now known as a bit field.
Right - but in actual programming practice, code tended to distinguish
between a "byte" and "N bit wide field of flags or whatever". And bytes
as character storage ran from 6 to 9 bits depending on the charset in use.
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