Great Circle Associates Firewalls
(December 1996)
 

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Subject: Re: Proxy & illegal IP numbers
From: Paul Ferguson <pferguso @ cisco . com>
Date: Fri, 06 Dec 1996 09:27:20 -0500
To: "David Untiedt" <David @ tns . co . za>
Cc: Jim . Egan @ iai . com, firewalls @ GreatCircle . COM

At 02:21 PM 12/6/96 +0000, David Untiedt wrote:

>
>Using the RFC1918 addresses is not in anyway illegal. These are 
>legitimate addresses that can be used by anyone legitimately.
>
>If you are using IP addresses that are not 'legal' (ie. not in
>RFC1918, and not allocated to you by your ISP) there is a good chance
>that they are legitimately in use by someone else on the internet. By
>hiding your addresses behind some sort of Network Address Translator
>(eg. a Gauntlet firewall) you get around this problem quite elegantly
>until you try to connect to a site that is legitimately using your,
>now hidden, 'illegal' IP addresses. 
>

Yes, but one should net expect RFC-1918 prefixes to be routable in
the global Internet. If you do, you're in for a rude awakening. ;-)

- paul

--
Paul Ferguson                                           ||        ||
Consulting Engineering                                  ||        ||
Herndon, Virginia   USA                                ||||      ||||
tel: +1.703.397.5938                               ..:||||||:..:||||||:..
e-mail: pferguso @
 cisco .
 com                         c i s c o S y s t e m s



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