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# /etc/protocols: This file describes the various protocols that are
# available from the TCP/IP subsystem. It should be
# consulted instead of using the numbers in the ARPA
# include files, or, worse, just guessing them.
# Internet (IP) protocols
#
ip 0 IP # internet protocol v4
icmp 1 ICMP # internet control message protocol
igmp 2 IGMP # internet group multicast protocol
ggp 3 GGP # gateway-gateway protocol
tcp 6 TCP # transmission control protocol
egp 8 EGP # exterior gateway protocol
pup 12 PUP # PARC universal packet protocol
udp 17 UDP # user datagram protocol
hmp 20 HMP # host monitoring protocol
idp 22 IDP # WhatsThis?
rdp 27 RDP # "reliable datagram" protocol
iso-tp4 29 ISO-TP4 # ISO Transport Protocol Class 4
# Internet (IPv6) extension headers
#
hopopt 0 HOPOPT # Hop-by-hop optons for IPv6
ipv6 41 IPv6 # IPv6
ipv6-route 43 IPv6-Route # Routing Header for IPv6
ipv6-frag 44 IPv6-Frag # Fragment Header for IPv6
ipv6-crypt 50 IPv6-Crypt # Encryption Header for IPv6
ipv6-auth 51 IPv6-Auth # Authentication Header for IPv6
icmpv6 58 IPv6-ICMP ICMPV6 ipv6-icmp icmp6 # ICMP for IPv6
ipv6-nonxt 59 IPv6-NoNxt # No Next Header for IPv6
ipv6-opts 60 IPv6-Opts # Destination Options for IPv6
iso-ip 80 ISO-IP # ISO Internet Protocol
encap 98 ENCAP # RFC1241 encapsulation
raw 255 RAW # RAW IP interface