Re: (PM) IP Pool

Scott Carpenter (scarpenter@assuredaccess.com)
Wed, 07 Jan 1998 14:20:15 -0800

Stephen,

Here is some RFCs that will clear up some confusion. I will not be
publicly defaced, especially when I'm right.

Scott

At 02:00 AM 12/31/97 -0500, Stephen Zedalis wrote:

>

>I agree. There were a few problems with Mr. Carpenter's message.
First,

>its VLSM, not CIDR that allows you to start at any subnet boundary.

This is from rfc1817:

>>>>

<excerpt>Classless Inter-Domain Routing (CIDR) ([RFC1518], [RFC1519]) is
deployed in the Internet as the primary mechanism to improve scaling
property of the Internet routing system. Essential to CIDR is the
generalization of the concept of variable length subnet masks (VLSM) and
the elimination of classes of network numbers (A, B, and C). The interior
(intra-domain) routing protocols that support CIDR are OSPF, RIP II,
Integrated IS-IS, and E-IGRP. The exterior (inter-domain) routing
protocol that supports CIDR is BGP-4. Protocols like RIP, BGP-3, EGP, and
IGRP do not support CIDR.

</excerpt><<<<<<<<

The above is saying CIDR is VLSM!

>Second, using a number that is a network number as well as a host
number

>will confuse all sorts of machines as Miquel has pointed out. Third,
its

>even worse if those numbers think they are on a broadcast network vice
a

>PTP link as the broadcast address is used in this setup.

rfc1518 & rfc1519 Will answer the above questions.

>

>On 30 Dec 1997, Miquel van Smoorenburg wrote:

>

>>In article
<<3.0.3.32.19971230105254.006b7ad4@gateway.assuredaccess.com>,

>>Scott Carpenter <<scarpenter@assuredaccess.com> wrote:

>>>The way I have found works best is if you start the pool at a subnett
boundry

>>>such as X.X.X.0 and set the pool size to 48. now remember that we are
in

>>>the age of cidr so the .0 is a valid ip address and it is ok if it
gets

>>>assigned to a user......

>>

>>I wouldn't do that if I were you:

>

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