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Date: Thu, 29 Jul 2010 11:01:05 +0300
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From: Denis Doroshenko <denis.doroshenko@gmail.com>
To: Ryan McBride <mcbride@openbsd.org>
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Cc: misc@openbsd.org, freebsd-pf@freebsd.org
Subject: Re: pf synproxy
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On 7/29/10, Ryan McBride <mcbride@openbsd.org> wrote:
> On Wed, Jul 28, 2010 at 07:59:20PM -0700, Justin wrote:
>  >  Sadly this means scalability (adding multiple synproxy boxes) is not
>  >  possible,
...
>  synproxy works by completing the 3-way handshake with the source first,
>  then negotiating a separate 3-way handshake with the client. Because the
>  negotiations are separate and the two endpoints have no direct knowlege
>  of each other, there sequence numbers negotiated are different. PF
>  handles translation between the different sets of sequence numbers, and
>  has to be man-in-the middle for every packet on the connection in order
>  to do this translation.

maybe the scalability issue raised there may be solved with CARP and
pfsync, so there may be two (or more?) gateways?