Hi, We have multiple ASA's (7.2) and installed on different locations and we have established VPN connection among all of them. Now we want to upgrade 8.3 version one by one on all location. After upgrading it is required new configuration or all configuration will be remaining same and can VPN tuneel support between installed asa 5505 both have different versions (7.2 and 8.3). Please tell us the advantage of version 8.3 as well. Thanks..