May 2005
Intermediate to advanced
312 pages
10h 29m
English
Content preview from Mobile IP Technology and Applications
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Protocol Authentication Extensions 61
SPI
A specific security context is identified in the authentication extension by the security
parameter index (SPI) value. The SPI is a 4-byte value that is configured as either a
hexadecimal or decimal value. (Unfortunately, this can often lead to confusion because the peer
devices can require the SPI value to be specified in different formats.) If a security violation is
received on a RRQ, the SPI value is the first item that should be verified, because it identifies
the security context to use in authenticating the message.
Of the over four billion values, the values 0 through 255 are reserved for specific contexts ...
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