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Date:      Tue, 09 Oct 2001 14:02:59 -0700
From:      Jon Drukman <jsd@cluttered.com>
To:        freebsd-questions@freebsd.org
Subject:   VPN + NATD = possible?
Message-ID:  <4.3.2.7.2.20011009140006.00b822d8@10.10.10.1>

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i was searching the freebsd archives for info on this but i am unclear what 
the deal is.

i have a windows 2000 box trying to use vpn.  my freebsd box provides ipfw 
and natd.  i allowed the gre protocol through ipfw, and i set up a port 
redirect for port 1723.  it doesn't seem to connect though.  i read 
somewhere about vpn's that use packet checksums to verify that the data 
hasn't been tampered with, and since natd messes with the packet headers, 
that would throw off the checksums.  i'm not sure if that has anything to 
do with this.  we're using a nortel vpn in case that matters.

any advice?  i need to be able to run the vpn through my freebsd 
box...  (or is there some way i can run vpn software ON the freebsd box and 
connect from my windows box through it?)

-jsd-


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