
Virtual Private Network Services 189
The SPI must be unique, is from one to eight characters long, and is
comprised of hexadecimal characters. Valid hexadecimal characters
are0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f.
The range from “0” to “ff” inclusive, is reserved by the Internet
Engineering Task Force (IETF) and are not allowed for use as an SPI. They
will not be accepted by the Firewall when entered as an SPI; an error
message will be displayed at the bottom of the Web browser window
when the Update button is pressed.
■
Security Association (SA)
A Security Association is the group of security settings relating to a
given network connection or set of connections. The Security
Association is based on the SPI, and includes the Destination Address
Range, IPSec gateway Address, Encryption method, Encryption Key
and Authentication Key.
DUA1611-0AAA02.book Page 189 Thursday, August 2, 2001 4:01 PM
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