troubleshooting Question

Pix 515 - Question about NAT with 3 interfaces + VPN

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RoutersHardware FirewallsCisco
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Hello.  I'm trying to figure out what sort of NAT config I need to use in order to have my Pix 515 function as a normal office router (dynamic NAT for outbound traffic from the inside interface), a VPN appliance (IPSEC listening on the outside interface) and be able to route both internal traffic and vpn client traffic out to a third interface connected to a seperate network (using a dynamic NAT similar to the one on the inside->outside interfaces).  I have tried a number of NAT configs and none of them have worked, so I have a feeling I am either going about it the wrong way or I am hoping to do something which cannot be done with a Pix 515.  Any one have any ideas?  Thanks!
Les Moore
Systems Architect
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