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 /etc/protocols 
\# Internet (IP) protocols
\#
\# Updated from http://www.iana.org/assignments/protocol-numbers and other
\# sources.
\# New protocols will be added on request if they have been officially
\# assigned by IANA and are not historical.
\# If you need a huge list of used numbers please install the nmap package.
ip 0 IP \# internet protocol, pseudo protocol number
\#hopopt 0 HOPOPT \# IPv6 Hop-by-Hop Option \[RFC1883\]
icmp 1 ICMP \# internet control message protocol
igmp 2 IGMP \# Internet Group Management
ggp 3 GGP \# gateway-gateway protocol
ipencap 4 IP-ENCAP \# IP encapsulated in IP (officially ``IP'')
st 5 ST \# ST datagram mode
tcp 6 TCP \# transmission control protocol
egp 8 EGP \# exterior gateway protocol
igp 9 IGP \# any private interior gateway (Cisco)
pup 12 PUP \# PARC universal packet protocol
udp 17 UDP \# user datagram protocol
hmp 20 HMP \# host monitoring protocol
xns-idp 22 XNS-IDP \# Xerox NS IDP
rdp 27 RDP \# "reliable datagram" protocol
iso-tp4 29 ISO-TP4 \# ISO Transport Protocol class 4 \[RFC905\]
xtp 36 XTP \# Xpress Transfer Protocol
ddp 37 DDP \# Datagram Delivery Protocol
idpr-cmtp 38 IDPR-CMTP \# IDPR Control Message Transport
ipv6 41 IPv6 \# Internet Protocol, version 6
ipv6-route 43 IPv6-Route \# Routing Header for IPv6
ipv6-frag 44 IPv6-Frag \# Fragment Header for IPv6
idrp 45 IDRP \# Inter-Domain Routing Protocol
rsvp 46 RSVP \# Reservation Protocol
gre 47 GRE \# General Routing Encapsulation
esp 50 IPSEC-ESP \# Encap Security Payload \[RFC2406\]
ah 51 IPSEC-AH \# Authentication Header \[RFC2402\]
skip 57 SKIP \# SKIP
ipv6-icmp 58 IPv6-ICMP \# ICMP for IPv6
ipv6-nonxt 59 IPv6-NoNxt \# No Next Header for IPv6
ipv6-opts 60 IPv6-Opts \# Destination Options for IPv6
rspf 73 RSPF CPHB \# Radio Shortest Path First (officially CPHB)
vmtp 81 VMTP \# Versatile Message Transport
eigrp 88 EIGRP \# Enhanced Interior Routing Protocol (Cisco)
ospf 89 OSPFIGP \# Open Shortest Path First IGP
ax.25 93 AX.25 \# AX.25 frames
ipip 94 IPIP \# IP-within-IP Encapsulation Protocol
etherip 97 ETHERIP \# Ethernet-within-IP Encapsulation \[RFC3378\]
encap 98 ENCAP \# Yet Another IP encapsulation \[RFC1241\]
\# 99 \# any private encryption scheme
pim 103 PIM \# Protocol Independent Multicast
ipcomp 108 IPCOMP \# IP Payload Compression Protocol
vrrp 112 VRRP \# Virtual Router Redundancy Protocol
l2tp 115 L2TP \# Layer Two Tunneling Protocol \[RFC2661\]
isis 124 ISIS \# IS-IS over IPv4
sctp 132 SCTP \# Stream Control Transmission Protocol
fc 133 FC \# Fibre Channel
udplite 136 UDPLite \# UDP-Lite
mpls-in-ip 138 MPLS-in-IP \# MPLS-in-IP \[RFC4023\]
manet 138 \# MANET Protocols
hip 139 HIP \# Host Identity Protocol
\# Internet (IP) protocols

\#hopopt0HOPOPT\# IPv6 Hop-by-Hop Option \[RFC1883\]

iso-tp429ISO-TP4\# ISO Transport Protocol class 4 \[RFC905\]

esp50IPSEC-ESP\# Encap Security Payload \[RFC2406\]

ah51IPSEC-AH\# Authentication Header \[RFC2402\]

etherip97ETHERIP\# Ethernet-within-IP Encapsulation \[RFC3378\]

encap98ENCAP\# Yet Another IP encapsulation \[RFC1241\]

l2tp115L2TP\# Layer Two Tunneling Protocol \[RFC2661\]

mpls-in-ip 138MPLS-in-IP\# MPLS-in-IP \[RFC4023\]