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challenge-length (Static and Dynamic PPP)


Hierarchy Level


Modify the length of the Challenge Handshake Authentication Protocol (CHAP) challenge by specifying the minimum and maximum allowable length, in bytes.

Best Practice:

We recommend that you configure both the minimum length and the maximum length of the CHAP challenge to at least 16 bytes.



Minimum length, in bytes, of the CHAP challenge.

  • Range: 8 through 63

  • Default: 16


Maximum length, in bytes, of the CHAP challenge. The maximum-length must be equal to or greater than the minimum-length.

  • Range: 8 through 63

  • Default: 32

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 12.2.