The scenario is:
I try to establish connection to the remote network by terminating GRE tunnel in my internal router, Cisco 6000 and terminate IPSec in my pix firewall (Fig. 2). How can I direct my workstation to go through GRE Tunnel and redirect the traffic to my pix to enclose GRE traffic in IPSEC tunnel? But I want also to keep the way they connect to the Internet as normally. The requirements are that I should do NAT in my (Cisco 6006) before I redirect the traffic to the pix firewall. In my normal scenario all data traffic are send to pix firewall than pix dose Nat before send the traffic to the Internet (Fig. 1), but in this case I have to do Nat in my Cisco 6000 before send them trough GRE tunnel than to my pix firewall. Please refer to the attached file for network diagram. And I apologize for my poor English and I appreciate for any help.