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Date:      Thu, 18 Mar 1999 14:04:26 -0800 (PST)
From:      Archie Cobbs <archie@whistle.com>
To:        henrich@flnet.com (Charles Henrich)
Cc:        freebsd-net@freebsd.org
Subject:   Re: SKIP on 3.1
Message-ID:  <199903182204.OAA94934@bubba.whistle.com>
In-Reply-To: <19990318135512.B15602@orbit.flnet.com> from Charles Henrich at "Mar 18, 99 01:55:12 pm"

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Charles Henrich writes:
> Im attempting to build a skip tunnel between two machiens that are tunning
> IPFW+NAT ... So basically in pictures:
> 
> 
> 10.x <---> [IPFW+NAT] <---> The Internet <--> [IPFW+NAT] <---> 10.x
> 
> I want to build a VPN between the two 10 networks... Any suggestions, points
> hints, RTFM's (which M? :) etc?  Thanks!
> 
> =====
> 
> My problem is I cant see how to create a VPN link between the two 10 networks
> without going through the NAT translation, which would totally break the VPN
> software.  Any ideas?

Don't use NAT at all, just do SKIP in tunnel mode and use the -f
flag to skiphost to make sure the source address for your packets
is the routable address and not the 10.x address.

If you *also* want address translation for the 10.x nets to reach
the outside world, this is do-able but takes some care (I've never
done it myself). See the notes in README.FreeBSD.

-Archie

___________________________________________________________________________
Archie Cobbs   *   Whistle Communications, Inc.  *   http://www.whistle.com


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