====== IPSec ======
   * [[:linux:ipsec|IPSec in linux]]
      * [[:openswan|Openswan]]

====== else where ======
   * **[[http://www.unixwiz.net/techtips/iguide-ipsec.html|An Illustrated Guide to IPsec]]**
   * [[http://wiki.openswan.org/index.php/Openswan/CiscoPIX|Openswan & Cisco PIX]]
   * [[http://www.daemon.be/maarten/openswanpix.html|Establish VPN - Cisco PIX]]