problems with VPN and NAT, help

From: nicolas (nfe@devillard.ch)
Date: 06/28/02 

From: nfe@devillard.ch (nicolas)
Date: 28 Jun 2002 01:32:40 -0700

hello,
I'm now in a company doing my thesis on VPN.
I have to implement VPN between them and some cutumers.

I have already implement a site-2-site VPN using GRE and Ipsec (for
authentification and security feature) for one of their custumer, but
when i want to do the second custumer i have a problem.

Because each of their custumer have the same IP plan with NAT
(172.20.0.0)

So with the first custumer (using tunnel0 for the VPN), the route from
our router is: ip route 172.20.0.0 255.255.0.0 tunnel 0

when i want to do the second cutsumer (using tunnel1), the route will
be
ip route 172.20.0.0 255.255.0.0 tunnel 1

This is not possible because i'll have two times 172.20.0.0 in the
routing table

To be able to do this i was thinking doing a double NAT (is it
possible? How to do it?)
Is there some others possibility better than a double NAT?

Thanks by Advance

Nicolas

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