Network Control Protocol

Not to be confused with Network Control Program.

A Network Control Protocol is a protocol that runs atop the Point-to-Point Protocol (PPP) and that is used to negotiate options for a network layer protocol running atop PPP. Network Control Protocols include:

• the Internet Protocol Control Protocol (IPCP) for the Internet Protocol, protocol code number 0x8021, RFC 1332
• the OSI Netwok Layer Control Protocol (OSINLCP) for the various OSI network layer protocols, protocol code number 0x8023, RFC 1377
• the AppleTalk Control Protocol (ATCP) for AppleTalk, protocol code number 0x8029, RFC 1378
• the Internetwork Packet Exchange Control Protocol (IPXCP) for the Internet Packet Exchange, protocol code number 0x802B, RFC 1552
• the DECnet Phase IV Control Protocol (DNCP) for DNA Phase IV Routing protocol (DECnet Phase IV), protocol code number 0x8027, RFC 1762
• the NetBIOS Frames Control Protocol (NBFCP) for NetBIOS Frames protocol (or NetBEUI as it was called before that), protocol code number 0x803F, RFC 2097
• the IPv6 Control Protocol (IPV6CP) for IPv6, protocol code number 0x8057, RFC 5072

NCP operates on the link layer and is defined in RFC 1332.