If you plan to attend Sunday's hands-on tutorial for using the IPsec
server at NANOG, you may want to have a look at the slides in
advance. You can find them at: http://www.packet-pushers.net/NANOG/ipsec/
Unix users, in particular, may need to prepare their systems by
building a new kernel and/or installing an IKE daemon.
The slides contain URLs for sample configuration files and startup
scripts. Those files are also available at the above URL.