MacOS 10.6, or Snow Leopard, features an integrated Cisco VPN client, able to connect to an IPSec Cisco VPN appliance.
To configure the VPN client, open the System Preferences and select Network. Click on the + symbol to add a new connection:
Select VPN as the Interface type, and Cisco IPSec as the VPN type. Enter a name for the connection and click Create:
Enter in the name or IP address of the VPN server as well as your VPN username and password - depending on how the authentication mechanism has been configured this may be your Windows login credentials or a separate account. Click on the Authentication Settings button:
Enter in the Group Name and Shared Secret details as provided by your network administrator, click OK.
Click Apply to save the changes. To initiate the connection, click the Connect button. After a few moments, provided that you have a connection to the Internet and the settings have been entered correctly, you will be connected:
To be able to connect and disconnect the VPN from the menu bar, tick the option to "Show VPN status in menu bar".