nanog mailing list archives
Re: IPv4 address length technical design
From: William Herrin <bill () herrin us>
Date: Wed, 3 Oct 2012 16:13:17 -0400
On Wed, Oct 3, 2012 at 3:22 PM, Izaac <izaac () setec org> wrote:
On Wed, Oct 03, 2012 at 06:52:57PM +0200, Seth Mos wrote:"Pick a number between this and that." It's the 80's and you can still count the computers in the world. :)And yet, almost concurrently, IEEE 802 went with forty-eight bits. Go figure. I'm pretty sure the explanation you're looking for is: It was with the word size of the most popular minis and micros at the time.
It wasn't. At the time. But at some point people of vision figured out that CPU word sizes would standardize on power-of-two powers of two. Really helps when you want to align data elements in memory if exactly 2 16 bit integers fit in the 32 bit word and exactly 2 32 bit integers fit in the 64 bit word. "And a half" is a phrase that makes life miserable in both software development and hardware design. IEEE figured it out later. The replacement for the MAC address is EUI-64. I still haven't figured out Bell's excuse with ATM. Regards, Bill Herrin -- William D. Herrin ................ herrin () dirtside com bill () herrin us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004
Current thread:
- IPv4 address length technical design Chris Campbell (Oct 03)
- Re: IPv4 address length technical design Sadiq Saif (Oct 03)
- Re: IPv4 address length technical design Kevin Broderick (Oct 03)
- Re: IPv4 address length technical design Seth Mos (Oct 03)
- Re: IPv4 address length technical design Izaac (Oct 03)
- Re: IPv4 address length technical design George Herbert (Oct 03)
- Re: IPv4 address length technical design William Herrin (Oct 03)
- Re: IPv4 address length technical design Owen DeLong (Oct 03)
- Re: IPv4 address length technical design Marco Hogewoning (Oct 04)
- Re: IPv4 address length technical design joel jaeggli (Oct 04)
- Re: IPv4 address length technical design Kevin Broderick (Oct 03)
- Re: IPv4 address length technical design Sadiq Saif (Oct 03)
- RE: IPv4 address length technical design Naslund, Steve (Oct 03)
- Re: IPv4 address length technical design Jeroen van Aart (Oct 29)
- Re: IPv4 address length technical design George Herbert (Oct 03)
- RE: IPv4 address length technical design Tony Patti (Oct 03)
- Re: IPv4 address length technical design Valdis . Kletnieks (Oct 03)