references

[1] RFC 1661

The Point-to-Point Protocol (PPP)

W. Simpson, Editor

July 1994

[2] RFC 1334

PPP Authentication Protocols

B. Lloyd, L&A, W. Simpson

October 1992

[3] RFC 1994

PPP Challenge Handshake Authentication Protocol (CHAP)

W. Simpson, Editor

August 1996

[4] Pluggable Authentication Modules

www.kernel.org/pub/linux/libs/pam/

[5] The FreeRadius Project

www.freeradius.org