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Date:      Wed, 28 Dec 2005 19:12:38 +0000
From:      Brian Candler <B.Candler@pobox.com>
To:        VANHULLEBUS Yvan <vanhu_bsd@zeninc.net>
Cc:        freebsd-net@freebsd.org
Subject:   Re: IPSEC documentation
Message-ID:  <20051228191238.GC7695@uk.tiscali.com>
In-Reply-To: <20051228164339.GB3875@zen.inc>
References:  <20051228143817.GA6898@uk.tiscali.com> <001401c60bc0$a3c87e90$1200a8c0@gsicomp.on.ca> <20051228153106.GA7041@uk.tiscali.com> <20051228164339.GB3875@zen.inc>

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On Wed, Dec 28, 2005 at 05:43:39PM +0100, VANHULLEBUS Yvan wrote:
> > Also excellent would be "bump in the wire" bridging, where the gateway
> > negotiates transport-mode security on behalf of clients without their being
> > aware of it, but as far as I know only OpenBSD supports that.
> 
> What is the benefit of transport mode for that, instead of just using
> an IPSec tunnel between the gates ???

"Opportunistic" encryption and gradual deployment.
http://www.thought.net/jason/bridgepaper/node9.html
(an interesting paper, read through to at least "Transparent Policy
Enforcement")

One use would be if you decided to roll out transport mode IPSEC across your
network; you could put all the legacy hosts behind such a gateway as a
transition measure until you had managed to upgrade them.

Regards,

Brian.



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