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To have real security it is necessary to secure each secvpn host and to have
firewalls on each secvpn host allowing only selected IP-Adresses and Ports to
pass through the VPN. 

If you wish you can buy an out of the box solution with high security, 
professional consulting and support based on diskless, cdrom-based Debian
PCs from Hewlett Packard (contact Ruediger Barz ruediger_barz@hp.com 
+49 6172 161335).

If you want to learn more about Hewlett Packards commercial solution:
  svpn_info.pdf	  (german version)
  svpn_info_e.pdf (english version)