5.40. CHAP-Challenge

5.40. CHAP-Challenge

Description

This Attribute contains the CHAP Challenge sent by the NAS to a PPP Challenge-Handshake Authentication Protocol (CHAP) user. It is only used in Access-Request packets.

If the CHAP challenge value is 16 octets long it MAY be placed in the Request Authenticator field instead of using this attribute.

A summary of the CHAP-Challenge Attribute format is shown below. The fields are transmitted from left to right.

 0                   1                   2
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
|     Type      |    Length     |    String...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

Type

60 for CHAP-Challenge.

Length

>= 7

String

The String field contains the CHAP Challenge.