NAT inside a VPN between PIX and Cisco device

Hello:
        We are trying to make a VPN between PIX and Cisco device, but using
NAT with the PIX external IP. The picture is like:
  Internal IP ----> PIX (NAT) ----> Internet ----> Cisco Router --->
"Routeable IP"
        Because the Cisco Router have internal and routeable networks, then
we must make a VPN from PIX using NAT inside the VPN.
        At least, we set up such VPN but using two external IPs in the PIX.
        Do you know how we can do it using only one external IP in the PIX ?

Regards,
Fernando Allendes.
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Received on Jan 19 2004