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Date:      Fri, 18 Oct 2002 17:31:43 +0200
From:      Julien Bournelle <Julien.Bournelle@int-evry.fr>
To:        freebsd-questions@freebsd.org
Subject:   Re: IPSEC/NAT issues
Message-ID:  <20021018153143.GD242@ipv6-5.int-evry.fr>
In-Reply-To: <C6304883FB11E347AD4958D3F14EC00AE893A2@ing.com>
References:  <C6304883FB11E347AD4958D3F14EC00AE893A2@ing.com>

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On Fri, Oct 18, 2002 at 04:54:33PM +0200, Danny.Carroll@mail.ing.nl wrote:
> I have often wondered about this..
> Surely there must be a way to do it.

Actually, I guess not, they're working on this problem at IETF. Maybe you
could look at this inetrnet-drafts:

draft-ietf-ipsec-nat-reqts-02.txt

Hope it helps,

julien.bournelle@int-evry.fr

> 
> -D
> 
> > -----Original Message-----
> > From: Thomas Spreng [mailto:spreng@insomniac.ch]
> > Sent: Friday, October 18, 2002 11:09 AM
> > To: Charles Henrich
> > Cc: freebsd-questions@freebsd.org
> > Subject: Re: IPSEC/NAT issues
> > 
> > 
> > On Thu, Oct 17, 2002 at 11:15:24AM -0700, Charles Henrich wrote:
> > > I have a network/firewall where I want to nat an entire 
> > network.  However, I
> > > also want nat traffic to one remote host in particular out 
> > on the internet to
> > > be IPsec'd as well.
> > > 
> > > [A] (10.x) [B] (Nat) [C] (Real IP)
> > > 
> > > I've setup IPsec on both machines, and from either machine 
> > (B,C) I can ssh to
> > > the other, with ipsec packets all happening happy as a 
> > clam.  However if try a
> > > connection from behind the nat box to the remote host (A,C) 
> > the key exchange
> > > works fine (between B&C), but then no data flows back and 
> > forth.  Anyone have
> > > any suggestions on this?  Thanks!
> > > 
> > > -Crh
> > hi charles,
> > 
> > im not sure if i understand your problem right but just keep 
> > in mind that you
> > cannot make a NAT between an IPSec connection. This is 
> > because the address
> > translation rewrites the ip headers and the ipsec 
> > authentification header 
> > prevents the packet from being altered.
> > 
> > greets
> > 
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-questions" in the body of the message
> > 
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