Name Value Meaning
PF_UNSPEC 0 Unspecified protocol
PF_LOCAL 1 local to host (pipes, portals)
PF_UNIX 1 synonym for PF_LOCAL to UNIX
PF_RISCOS 1 synonym for PF_LOCAL to RISC OS
PF_INET 2 inter-network (UDP, TCP, etc)
PF_IMPLINK 3 arpanet imp protocols
PF_PUP 4 pup protocols: e.g. BSP
PF_CHAOS 5 MIT CHAOS protocols
PF_NS 6 XEROX NS protocols
PF_NBS 7 ISO protocols
PF_ECMA 8 European Computer Manufacturers protocols
PF_DATAKIT 9 Datakit protocols
PF_CCITT 10 CCITT protocols, X.25 etc
PF_SNA 11 IBM SNA
PF_DECnet 12 DECnet
PF_DLI 13 Direct Data Link interface
PF_LAT 14 LAT
PF_HYLINK 15 NSC Hyperchannel
PF_APPLETALK 16 AppleTalk protocols
PF_ROUTE 17 Internal Routing Protocol
PF_LINK 18 Link layer interface
PF_COIP 20 connection-oriented IP, aka ST II
PF_CNT 21 Computer Network Technology
PF_IPX 23 Novell Internet Protocol
PF_SIP 24 Simple Internet Protocol
PF_ISDN 26 Integrated Services Digital Network
PF_E164 PF_ISDN CCITT E.164 recommendation
PF_INET6 28 IPv6
PF_NATM 29 native ATM access
PF_ATM 30 ATM
PF_NETGRAPH 32 Netgraph sockets
PF_MAX 33 number of protocols available
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