The ACS administrator can set up VPN connections to establish an encrypted communications between the ACS and a host on a remote network. The encryption creates a security tunnel for a dedicated communications.
• A secure tunnel between ACS and a gateway at a remote location so every machine on the subnet at the remote location has a secure connection with ACS.To set up a security gateway, you can install IPSec on any machine that does networking over IP, including routers, firewall machines, application servers, and end-user machines.The ESP and AH authentication protocols are supported. RSA Public Keys and Shared Secret are also supported.