Some online services the University of Heidelberg offers are only available if you are a part of their VPN. I don't want to use one of these crappy Cisco-tools, but fortunately there is vpnc.
Assuming the installation worked fine, you just have to enter the
information in /usr/local/etc/vpnc.conf. It looks like
that:
IPSec gateway vpnsrv1.urz.uni-heidelberg.de IPSec ID tunnel IPSec secret "group pass" Xauth username "your login"@uni-heidelberg.de Xauth password "your pass"
Unfortunately, they don't tell you the group password. But you can decode it once you have downloaded the configuration file from the "URZ" homepage.
I needn't tell you that the decoder mustn't be used for malicious activity...so just have fun.