Applied Cryptography, Bruce Schneier, John Wiley & Sons, 0-471-11709-9.

Brandväggar vid anslutning till Internet [Firewalls in Internet Connections], Statskontoret, Stockholm.

Building Internet Firewalls, D. Brent Chapman and Elizabeth D. Zwicky, O'Reilly & Associates Inc, 1-56592-124-0.

Computer Security Basics, Deborah Russel and G.T. Gangemi Sr, O'Reilly & Associates Inc.

Practical Unix & Internet Security, Simson Garfinkel and Gene Spafford, O'Reilly & Associates Inc, 1-56592-148-8.

TCP/IP Network Administration, Craig Hunt, O'Reilly & Associates Inc, 0-937175-82-X.

Virtual Private Networks, Charlie Scott, Paul Wolfe, and Mike Erwin, O'Reilly & Associates Inc, 1-56592-319-7.

RFC 793: Transmission Control Protocol, J. Postel.

RFC 826: An Ethernet Address Resolution Protocol, David C. Plummer.

RFC 1918: Address Allocation for Private Internets, G. J. de Groot, D. Karrenberg, E. Lear, B. Moskowitz, and Y. Rekhter.

RFC 2131: Dynamic Host Configuration Protocol, R. Droms.

RFC 2401: Security Architecture for the Internet Protocol, S. Kent and R. Atkinson.

RFC 2408: Internet Security Association and Key Management Protocol (ISAKMP), D. Maughan, M. Schertler, M. Schneider, and J. Turner.

RFC 2409: The Internet Key Exchange (IKE), D. Carrel and D. Harkins.

RFC 2865: Remote Authentication Dial In User Service (RADIUS), C. Rigney, A. Rubens, W. Simpson, and S. Willens.

RFC 3261: SIP: Session Initiation Protocol, M. Handley, H. Schulzrinne, E. Schooler, J. Rosenberg, G. Camarillo, A. Johnston, J. Peterson, and R. Sparks.