Suppose your LAN is 10.10.10.x and your central site is 20.20.20.x
Let's attack NAT first. I will make it simplier putting the ip address from the loopback interface in a "NAT pool". Also we need to make the router aware that for different destinations you need different NATs.
ip nat inside
int loopback 0
ip address 22.214.171.124 255.255.255.0
ip nat outside
ip nat pool LOOPBACK-POOL 126.96.36.199 188.8.131.52 netmask 255.255.255.0
ip nat inside source list INTERNET interface g2/0 overload
ip nat inside source list CENTRALSITE pool LOOPBACK-POOL overload
ip access-list extended INTERNET
deny ip 10.10.10.0 0.0.0.255 184.108.40.206 0.0.0.255
permit ip 10.10.10.0 0.0.0.255 any
deny ip any any
ip access-list extended CENTRALSITE
permit ip 10.10.10.0 0.0.0.255 220.127.116.11 0.0.0.255
deny ip any any
Now we will attack the VPN issue. NAT generally messes up traditional ACL-based VPNs so I will choose route-based VPN. To do that I will need to create a tunnel interface and make sure to route through the tunnel interface. Also we need configure "ip nat outside" in tunnel interface so we can mix VPN and NAT altogheter. The following is the partial configuration of the VPN.
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