This is a mini-HOWTO document on installing, configuring and using the
Cisco VPN client on Linux. I just threw this together very quickly after
installing on a custom Linux laptop and connecting into a Cisco VPN
concentrator on the first try. It also includes a section on making the
Linux VPN client a single-click (or single-cli-command) operation.

Cisco VPN Client on Linux mini-HOWTO
  by Kevin Saling
  v.1.0, March 04, 2003.
  v.1.1, February 12, 2004.

http://firstpacket.com/comments.php?id=189_0_1_0_C4