VPN site to site

[Maro.Cisco]

Guyz i have 2 pix connected to outside internet and connected internally to VPN switch which is connected to 1 ASA and VPN concentrator. right now i have VPN concentrator to terminate VPN remote clients . now i have a public ip address that i wanna use for site to site VPN so where is the best place to  configure this ???

Current PIX configuration

-----------------------

interface Ethernet0

nameif outside

security-level 0

ip address 1.1.1.1 255.255.255.240 standby 1.1.1.2

!

interface Ethernet1

nameif inside

security-level 100

ip address 192.168.6.1 255.255.255.0 standby 192.168.6.2

!

[Maro.Cisco]

What im thinking to do , on my ASA create outside interface with 192.168.6.11 and have the IPsec configuration done and then have the PIX to nat 192.168.6.11 to my public IP and create access-list to allow specific ports needed for the IPSEC tunnel