CHAP Success and Failure Frames

A CHAP Success frame (code 0x03) is transmitted by the authenticator when it receives a recognizable CHAP response frame that contains an acceptable CHAP name and response value.

A CHAP Failure frame (code 0x04) is transmitted by the authenticator when it receives a CHAP response frame that is not recognizable, or that contains an unacceptable PAP id and PAP password pair. The link is always terminated.