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Date:      Sun, 19 May 1996 00:10:16 -0500
From:      Clint Marek <clintm@ICSI.Net>
To:        Archie Cobbs <archie@whistle.com>
Cc:        terry@lambert.org, dwhite@riley-net170-164.uoregon.edu, FreeBSD-Questions@FreeBSD.org, bmah@cs.berkeley.edu
Subject:   Re: ip masquerading
Message-ID:  <319EAD38.3F54BC7E@icsi.net>
References:  <199605182006.NAA05459@bubba.whistle.com>

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Archie Cobbs wrote:

> You seem to be implying that masquerading is ``detectable'' in some
> way by external machines, that is, that somehow it's going to screw
> up (or make angry) other routers on the Internet. This completely
> escapes me.
> 
> In other words, if you're saying it violates some protocol, then that
> violation should be visible on the wire between the masquerading host
> and the rest of the Internet. Can you describe what that violation is?
> 
> Remember, we're talking about a situation where the hosts behind the
> masquerading host are on a ``leaf'' network, without any other route
> to the Internet. Obviously, it would be totally screwey otherwise.
> 
> So as far as the Internet, the IETF, the protocol police, and everybody
> else is concerned, there's only a single host at this site and it's
> obeying all the rules! If you disagree, then the burden of proof is on
> you to quote the relevant RFC's.
> 

This is what I was using masquerading for.  I did not want the possibility of a
connection being initiated from the internet.  I used reserved "unrouteable" IPs
(192.168.*.*) on the ethernet, and my gateway/router/masquerader/firewall was my PC
connected to the net via PPP.  I was not aware that masquerading was unique/specific
to Linux.  Does the router-in-a-box from BSDi use socks?  They advertise needing only
one IP address to connect an ethernet to the internet. 

BTW, the Linux masquerading home page is http://www.indyramp.com/masq/

Clint



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