You may want to investigate Cisco PIX Security Appliance Release Notes Version 7.0(1)
Virtual Private Networking (VPN) Services
Enhanced Spoke-to-Spoke VPN Support
Version 7.0(1) improves support for spoke-to-spoke (and client-to-client) VPN communications, by providing the ability for encrypted traffic to enter and leave the same interface. Furthermore, split-tunnel remote access connections can now be terminated on the outside interface for the security appliance, allowing Internet-destined traffic from remote access user VPN tunnels to leave on the same interface as it arrived (after firewall rules have been applied).
The same-security-traffic command permits traffic to enter and exit the same interface when used with the intra-interface keyword enabling spoke-to-spoke VPN support. For more information, see the " Permitting Intra-Interface Traffic" section in the in the Cisco Security Appliance Command Line Configuration Guide.
Hope this helps.
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