I need to set up a site to site VPN between my office and a customer office.
This VPN will be used for about 30 specific pcs in the customers environment, each on a separate subnet, one on a subnet that matches mine. Because of the matching subnet, they have asked me to NAT all incoming traffic as though it were from 10.100.120.1
Can someone provide the router instructions for me to configure this?
Office equipment: Cisco 2811 IOS c2800nm-advipservicesk9-mz.124-24.T
Office outside: 18.104.22.168
Office inside: 192.168.3.0
Customer outside: 22.214.171.124
Customer inside: A list of 30 machines including one at 192.168.3.100
NAT source address to 10.100.120.1
Pre-Shared Key: THISISTHEKEY
SA Life Time: 28800
DH Group: Group 2
SA Lifetime: 86400