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Radius Accounting Inspection in ASA

Reference link below:

http://www.cisco.com/en/US/docs/security/asa/asa72/configuration/guide/inspect.html#wp1504796

I am having hard time in interpreting the example of issues in mobile phone GPRS network and implementation of radius accounting inspection in PIX/ASA to guard against spoofing.

The text is very confusing and does not explain how specific command set as indicated in example is helping and what is meaning and purpose of each parameter command.

I am assuming that ASA / PIX in this example is transiting the traffic between a NAS (GPRS server) and the radius server and thus is snooping / inspecting against potential spoofed server / user?

Under policy-map type inspect radius-accounting, parameters, send response, how is PIX's sending a accounting response (accounting responses are sent by radius server in response to accoutning start and stop messages from the NAS) help against spoofing?

Any help will be appreciated.

Thanks

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