RFC 1340　 Assigned PPP DLL Protocol Numbers

（赤字は、本講義関連プロトコル）
 Value (in hex) Protocol Name
 0001 to 001f  reserved (transparency inefficient)
  0021  Internet Protocol
 0023  OSI Network Layer
 0025  Xerox NS IDP
 0027  DECnet Phase IV
 0029  Appletalk
 002b  Novell IPX
 002d  Van Jacobson Compressed TCP/IP
 002f  Van Jacobson Uncompressed TCP/IP
 0031  Bridging PDU
 0033  Stream Protocol (ST-II)
 0035  Banyan Vines
 0037  reserved (until 1993)
 00ff  reserved (compression inefficient)
 0201  802.1d Hello Packets
 0231  Luxcom
 0233  Sigma Network Systems
 8021  Internet Protocol Control Protocol
 8023  OSI Network Layer Control Protocol
 8025  Xerox NS IDP Control Protocol
 8027  DECnet Phase IV Control Protocol
 8029  Appletalk Control Protocol
 802b  Novell IPX Control Protocol
 802d  Reserved
 802f  Reserved
 8031  Bridging NCP
 8033  Stream Protocol Control Protocol
 8035  Banyan Vines Control Protocol
 8037  reserved till 1993
 80ff  reserved (compression inefficient)
 c021  Link Control Protocol（LCP）
 c023  Password Authentication Protocol（PAP）
 c025  Link Quality Report
 c223  Challenge Handshake Authentication Protocol（CHAP）