Documentation

Building a Bastion Host Using HP-UX 11
Recipe by Kevin Steves for protecting HP-UX 11.
http://secinf.net/unix_security/Building_a_Bastion_Host_Using_HPUX_11.html

Communications-Electronics Security Group
Independently evaluates and certifies the level of trust that may be placed in IT security features.
http://www.cesg.gov.uk/

Lance Spitzner Whitepapers
Papers on armoring Solaris, Linux and configuring firewalls.
http://www.spitzner.net/