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Date:      Thu, 04 Apr 2002 12:01:02 -0800
From:      Lars Eggert <larse@ISI.EDU>
To:        Kris Kirby <kris@catonic.net>
Cc:        freebsd-net@freebsd.org
Subject:   Re: VPN / VLAN?
Message-ID:  <3CACB0FE.5060500@isi.edu>
References:  <Pine.BSF.4.33.0204041937170.27304-100000@spaz.catonic.net>

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Kris Kirby wrote:
>>What is required to make this work though is that you can get a few
>>static IPs inside the 216.6.6.129/25 net (in your example) to relay.
> 
> I'm a little confused by this.

It's simple, really. At ISI, for example, we have the 128.9/16 subnet. 
We use a class C inside that block, and relay it over the tunnel to the 
remote site. Thus, at the remote site, everything looks like your are at 
the main site: you get an 128.9/16 IP address, etc. The NAT box is 
invisible.

The down side for a normal home user is that you need someone that has a 
globally routable block (like 128.9/16) that is willing to hand you a 
sublock, and let you run one end of the relay on their system. It can't 
magically make your NAT'ed machines globally routable.

Lars
-- 
Lars Eggert <larse@isi.edu>               Information Sciences Institute
http://www.isi.edu/larse/              University of Southern California

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