Package vpnc

IPSec VPN client compatible with Cisco equipment

http://www.unix-ag.uni-kl.de/~massar/vpnc/

A VPN client compatible with Cisco's EasyVPN equipment.

Supports IPSec (ESP) with Mode Configuration and Xauth. Supports only
shared-secret IPSec authentication, 3DES, MD5, and IP tunneling.

General Commands
Command Description
cisco-decrypt decrypts an obfuscated Cisco vpn client pre-shared key
System Administration
Command Description
vpnc client for Cisco VPN3000 Concentrator, IOS and PIX