Re: v6 & DSL / Cable modems [was: Private use of non-RFC1918 IP space

[Owen DeLong <owen () delong com>]

On Feb 5, 2009, at 8:24 AM, Roger Marquis wrote:

> > > * NAT disadvantage #3: RFC1918 was created because people were  
> > > afraid of
> > > running out of addresses. (in 1992?)
> >
> > Yes. One of my colleague, who participated in development of RFC  
> > 1918 confirmed it.
>
> Your colleague was wrong.  I was one of several engineers who handed  
> out
> "private" addresses back before RFC1918 even though we could get  
> "public"

You are wrong....

Quoting from RFC 1597 (a precursor which was obsoleted by RFC 1918):

2. Motivation

   With the proliferation of TCP/IP technology worldwide, including
   outside the Internet itself, an increasing number of non-connected
   enterprises use this technology and its addressing capabilities for
   sole intra-enterprise communications, without any intention to ever
   directly connect to other enterprises or the Internet itself.

   The current practice is to assign globally unique addresses to all
   hosts that use TCP/IP.  There is a growing concern that the finite  
IP
   address space might become exhausted.  Therefore, the guidelines for
   assigning IP address space have been tightened in recent years [1].
   These rules are often more conservative than enterprises would like,
   in order to implement and operate their networks.

Note the specific reference in the second paragraph to address space  
exhaustion.

Owen