I had to change the IP for a client's internal network and the external IP is to remain the same. Our end of the site to site VPN is on an ASA 5505.
Scenario is: old ip had to be changed from 10.1.20.10 255.255.255.255 to 10.1.20.7 255.255.255.255 on the inside remote network. I have tried to modify the old tunnel and built new one "multiple times" but when the tunnel comes up it is associating with the old IP of 10.1.20.10. Apparently the data center where the vpn is going changed the server to another one. I do not have access to the other end of the tunnel, but they said they changed it for me to be able to connect with the new IP. They also left the old tunnel up as well.
Help Please :)