Is it the cisco VPN client that they provide for windows? If so you can use the vpnc client for linux.
Just run
$ sudo yum install vpnc
$ sudo mouspad /etc/vpnc/<myvpn>.conf
Enter the following:
IPSec gateway <my.vpn.gateway> (Your gateway IP or hostname)
IPSec ID <my.gateway.id> (This is your group username)
IPSec secret <mysecret> (Your group password)
Xauth username <username> (your personal username)
Xauth password <password> (your personal password)
Save and close mousepad.
Download
http://www.twimba.com/blogs/luis/wp-...008/08/tun.zip
Unzip the file, cd into the directory that was created and copy tun.ko using
$ sudo cp tun.ko /lib/modules/2.6.23.9lw/kernel/drivers/net
Run the Command
$sudo depmod
Plug in and connect to the network:
$sudo vpnc <myvpn>
This works for me on my wireless uni network.