FreeS/WAN IPsec for Linux, OCLUG tutorial 2003-01-30, RGB
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IPsec:

Internet-standard network security protocols
Messy and overly complex
But better than the alternatives

Located at the network layer:

Covers all traffic, all protocols
Including ICMP, etc.
Applications need not change.
Independant of hardware.

Last modified by Richard Guy Briggs , Thu Jan 30 14:19:00 EST 2003 .