Connecting IPSec from Behind a gateway

[Ivailo Tanusheff]

As far as I know it's not possible to make IPSec when you use NAT, as IP 
address is used with crypto.
But you can make PPP or PPTP tunel between those two hosts and use IPSec 
between addresses in the tunel.

Ivailo Tanusheff
Senior System administrator
ProCredit Bank (Bulgaria) AD

tel. +359 2 921 7161
fax +359 2 921 7110
http://www.procreditbank.bg


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Subject
Connecting IPSec from Behind a gateway






I am trying to connect 2 FreeBSD 5.4 boxes with an IPSec tunnel using
racoon.   The problem is the second box is behind a nat'd gateway. 
The gateway router is a commercial box with "IPSEC Passthrough"
enabled.

What do I need to do to get this to work?
Which IP (global or private) should I use when configure the connection?

TIA,
Tomoki Taniguchi
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