Right.  The best (only?) way to guarantee against private IP addresses 
'leaking' onto the Internet is to set up access lists to prevent it.

Casey

>From: Tayo Dada <[EMAIL PROTECTED]>
>Reply-To: Tayo Dada <[EMAIL PROTECTED]>
>To: "Cisco group study (E-mail)" <[EMAIL PROTECTED]>
>Subject: vpn
>Date: Mon, 18 Sep 2000 15:55:02 +0100
>
>i am trying to simulate a vpn connection in a lab using illegal
>addresses for internal hosts and legal addresses for the connections
>between routers. how do i prevent packets from internal hosts with
>illegal ip address from entering the internet so that i can ensure that
>internal hosts are using the vpn connection to access remote networks.
>is it just a simple access list? is this how it is done on the internet.
>i am using igrp accross four routers.
>
>
>thanks
>
>tayo
>
>
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