RADIUS attribute from rfc5090

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Digest-Stale

This attribute is sent by a RADIUS server in order to notify
         the RADIUS client whether it has accepted a nonce.  If the
         nonce presented by the RADIUS client was stale, the value is
         'true' and is 'false' otherwise.  The RADIUS client puts the
         content of this attribute into a stale directive of the WWW-
         Authenticate header in the HTTP-style response to the request
         it wants to authenticate.  The attribute MUST only be used in
         Access-Challenge packets.
   Type
         120 for Digest-Stale
   Length
         3
   Text
         The attribute has either the value 'true' or 'false' (both
         values without surrounding quotes).

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