vpn on linux

Hi, i was wondering if there is any good vpn client for linux, that is compatible with the cisco system network.
I need this because at my university the wireless network is under vpn encryption and they don't give any client for unix.... only window$

any help will be welcome :D

cisco does have a linux version of their VPN, unfortunately you have to be a cisco subscriber to download it.
but how bout this http://openvpn.sourceforge.net/