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Date:      Mon, 09 Dec 2002 17:00:06 -0600
From:      Eric Anderson <anderson@centtech.com>
To:        Fernando Gleiser <fgleiser@cactus.fi.uba.ar>
Cc:        security@freebsd.org
Subject:   Re: (slightly OT) IPSec with dynamic IP
Message-ID:  <3DF52076.4020700@centtech.com>
References:  <20021209195332.X5648-100000@cactus.fi.uba.ar>

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Fernando Gleiser wrote:
> I'm sorry if this is OT for -security. I sent it to -questions but
> got no answer.
> 
> I need to set up a VPN between a corporate LAN and roaming users. The
> firewall is a FreeBSD 4.7 box with ipf/ipnat and will act as a security
> gateway for the tunnel.
> 
> On the other side there are several Win2K/XP boxes connected to the
> Internet via DSL/cable modem/dialup/carrier pigeon/whatever and they have
> a different IP every time they connect.
> 
> The problem is: every single doc/tutorial/man page/ I've read says how to
> set up the SA with static IPs, but now one side is dynamic.
> 
> So the questions are:
> 
> 1. Is this posible?
> 2. If it's posible, can I do it with IKE/ISAKMP?
> 3. Does anybody have a pointer to a doc which says how to do it? I'll rtfm,
>    just tell me where the fm is :)

1. Yes, it is possible.. You'll have to do something with certificates 
probably, or use mpd on the server end.  There are other solutions, 
those are just a few things..

2. Maybe..  Are you trying to connect each individual windows box, or 
are you going to have a firewall/gateway that does this for all of them 
(the entire lan)?

3.  I don't know .. maybe... I have this working, so maybe I should 
write one up.. :)

Eric


-- 
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Eric Anderson	   Systems Administrator      Centaur Technology
Beware the fury of a patient man.
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