TABLE 1: Authentication and Encryption Settings Under RRAS
Desired condition	Clients	Non-Microsoft Clients	Server
Allow any authentication including clear text	Can use PAP, SPAP, CHAP, MD5-CHAP, or MS-CHAP	Can use PAP or CHAP	Can use PAP, SPAP, CHAP, MS-CHAP; cannot use MD5-CHAP
Require encrypted authentication	Can use SPAP, CHAP, MD5-CHAP, or MS-CHAP; cannot use PAP	Can use CHAP or SPAP; cannot use PAP	Can use SPAP, CHAP, or MS-CHAP; cannot use PAP or MD5-CHAP
Require Microsoft encrypted authentication	Can use only MS-CHAP	Can use MS-CHAP only if client supports it	Can use only MS-CHAP