[124609] in North American Network Operators' Group
Re: legacy /8
daemon@ATHENA.MIT.EDU (bmanning@vacation.karoshi.com)
Fri Apr 2 20:21:52 2010
Date: Sat, 3 Apr 2010 00:20:58 +0000
From: bmanning@vacation.karoshi.com
To: Owen DeLong <owen@delong.com>
In-Reply-To: <3135E5A4-A45F-44A3-A01D-A86F71988E45@delong.com>
Cc: NANOG List <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Fri, Apr 02, 2010 at 03:46:55PM -0700, Owen DeLong wrote:
>
> The expectation was that those /8s would be subnetted into vast arrays of "Class C" sized chunks and that subnets within a given /8 all had to be the same size (this used to be necessary to keep RIP happy and every machine participating in RIP routing had to have an /etc/netmasks (or equivalent) table that tracked "THE" subnet mask for each natural prefix).
er, again, not true. the space was originally, net/host - the mantra was "bridge where
you can, route when you must" - there were expected to be a few networks with millions
of hosts within each broadcast domain. (anyone else remember the ARP storms of the
1970s/1980s?)
routing came into its own later, along with classful addressing.
> Owen
>
--bill
