If you are not hip to pfSense I suggest you check it out. It is an open source firewall that is making waves in InfoSec. The pfSense guys have a great howto for configuring IPSec VPN on the pfSense firewall as well as making connections via a freeware Windows IPSec VPN client called Shrew Soft which can be read by clicking here. The only item lacking in the article is a recommendation for a Mac OSX client as well as configuration tips for a Mac OSX client which is the sole point of this article. Below is information about where to download a freeware Mac OSX IPSec VPN client and then the necessary configuration to make a connection to the suggested settings noted in the howto of the pfSense web site.
Not sure if Fortinet makes it impossible to find the FortiClient SSL VPN application for Mac OSX on purpose or not but it appears to be free for the simple client version so I wanted to provide a location to download the client easily. On Windows you can bring up Internet Explorer and make a SSL VPN connection easily but since IE is not available on OSX it is necessary to have the stand alone FortiClient SSL VPN application. Be careful if you are going to download the Fortinet FortiClient elsewhere as if it is anything other than the simple SSL VPN client it is really bloated.
If you have recently removed the Cisco Systems VPN client from your Windows XP computer you may notice that it does not always uninstall the network adapter connection it created during install. When viewing your Network Connections you will notice there is still a Cisco Systems VPN Adapter connection that looks similar to the typical Ethernet adapter on your computer. You would think that the ability to remove this item should be as simple as right clicking the adapter in question and selecting Delete from the drop down however this is not the case. Don’t worry removing it is easy but you must do it from the Device Manager instead of the Network Connections interface.