access-challenge

[Srinivasa Rao Chigurupati]

Hi
1. Will FreeRadius challenges with access-challenge if auth-type is PAP?
     If answer is it depends on some configuration, how to configure it?

2.  How  FreeRadius  understands  incoming Radius access-request packet 
    contains PAP authentication information, CHAP authentication information
    or MS-CHAP authentication information or other authentication 
information?

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Thanks
Srinivasa Rao Chigurupati