these factors, hexadecimal keys should be used whenever possible. Finally, some
implementations of the MN-AAA extension differ when implementing PPP-style Challenge
Handshake Authentication Protocol (CHAP) for use with RADIUS servers. Although the
standards define specific values, 2 for keyed MD5 and 3 for MD5-HMAC, some vendors allow
the specific algorithms to be configured for any SPI. Newer versions of IOS support the
ip mobile secure mn-aaa command, which allows these algorithms to be mapped to any of the
nonreserved SPI values.
Summary
To this point, we covered many facets of the Mobile IP protocol and its deployment, concluding ...
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