PPP Assigned Protocol Fields
Value (in hex) Protocol Name
0001 Padding Protocol
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
0035 Banyan VINES
0041 Cisco Systems
0201 802.1d Hello Packets
0203 IBM Source Routing BPDU
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
803d Multilink Control Protocol
80fd Compression Control Protocol
c021 Link Control Protocol
c023 Password Authentication Protocol
c025 Link Quality Report
c223 Challenge Handshake Authentication Protocol
Notice that both Password Authentication Protocol (PAP) and Challenge Handshake
Authentication Protocol (CHAP) are listed toward the bottom of this table. These two
protocols are discussed later in this chapter; however, it is significant to note them here in
the context of PPP’s broad support for features. Authentication, multilink (the ability to
bond different physical channels into a single logical connection), and compression are all
supported in PPP and its associated upper layer protocols.
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