I have actually just left the study group, but my parting advice is to
confirm
Priscillas advice. The private ranges are designed for your purpose, and if
you need a class A then please use the 10.0.0.0 range. It will avoid a lot
of potential problems.
By the way Priscillas book Top Down Network Design, is very good.
I wish you all luck and success in your career and certification pursuits.
Regards
John Spencer, CCNP.
-Original Message-
From: Priscilla Oppenheimer [SMTP:[EMAIL PROTECTED]]
Sent: Thursday, May 17, 2001 9:13 PM
To: [EMAIL PROTECTED]
Subject: Re: Using Public addresses as Internally [7:4835]
Why not use something from the private ranges?
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
Also, Class A would let you address 16 million of these devices. Do you
really have that many?
Also, quite a few large companies, universities, and service providers
have
hung onto their Class A address. What would happen if the users from the
Internet that you mentioned below happened to be on the same Class A as
you
are using? IP spoofing protection (if you are using it) might not let
these
users in. Even if they got in, the responses to their packets might get
routed internally not back to them. You could avoid these problems, of
course, but why even risk having them?
I'm sure you have your reasons and you're just trolling for a sanity
check.
Without more details, we have to give you the sort of canned response that
it's a bad idea. ;-)
Priscilla
At 10:01 AM 5/17/01, Bruce Williams wrote:
My company wants to use public addresses from the Class A range
internally.
I realize the danger if these routes got advertised on the Internet, but
is
this something that is considered acceptable if it is carefully done to
prevent the risk of these routes being propagated out on the Public
Internet? These networks will be used to address equipment in a multitude
of
cellular radio base stations around the country and they will only be
connected to our network. There will central locations where users from
the
internet could access a database which will query these systems, but
there
will not be a direct internet connection. I would appreciate any advice
on
this.
Thanks,
Bruce Williams
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Priscilla Oppenheimer
http://www.priscilla.com
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