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ROPE Language Reference - "/etc/protocols"

The $ct_proto and $ip_protocol registers contain a number that indicates the IP protocol type contained in the packet or in use on the ConnTrack connection.

The possible values contain in these registers are those held in the /etc/protocols file. For example: TCP/IP has value 6, and UDP is 17. For convenience, Rope provides the values in symbolic constants with names like IPPROTO_TCP, IPPROTO_UDP etc. These names are taken from the first column of the file, converted to uppercase, with all non-alphanumeric charcters changed to underbars, and the string "IPPROTO_" added to the front. This replacement is performed at compile time.

Here's a listing the /etc/protocols file from RedHat Linux, showing the other possible values..

ip      0       IP              # internet protocol, pseudo protocol number
#hopopt 0       HOPOPT          # hop-by-hop options for ipv6
icmp    1       ICMP            # internet control message protocol
igmp    2       IGMP            # internet group management protocol
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
cbt     7       CBT             # CBT, Tony Ballardie
egp     8       EGP             # exterior gateway protocol
igp     9       IGP             # any private interior gateway (Cisco: for IGRP)
bbn-rcc 10      BBN-RCC-MON     # BBN RCC Monitoring
nvp     11      NVP-II          # Network Voice Protocol
pup     12      PUP             # PARC universal packet protocol
argus   13      ARGUS           # ARGUS
emcon   14      EMCON           # EMCON
xnet    15      XNET            # Cross Net Debugger
chaos   16      CHAOS           # Chaos
udp     17      UDP             # user datagram protocol
mux     18      MUX             # Multiplexing protocol
dcn     19      DCN-MEAS        # DCN Measurement Subsystems
hmp     20      HMP             # host monitoring protocol
prm     21      PRM             # packet radio measurement protocol
xns-idp 22      XNS-IDP         # Xerox NS IDP
trunk-1 23      TRUNK-1         # Trunk-1
trunk-2 24      TRUNK-2         # Trunk-2
leaf-1  25      LEAF-1          # Leaf-1
leaf-2  26      LEAF-2          # Leaf-2
rdp     27      RDP             # "reliable datagram" protocol
irtp    28      IRTP            # Internet Reliable Transaction Protocol
iso-tp4 29      ISO-TP4         # ISO Transport Protocol Class 4
netblt  30      NETBLT          # Bulk Data Transfer Protocol
mfe-nsp 31      MFE-NSP         # MFE Network Services Protocol
merit-inp       32      MERIT-INP       # MERIT Internodal Protocol
sep     33      SEP             # Sequential Exchange Protocol
3pc     34      3PC             # Third Party Connect Protocol
idpr    35      IDPR            # Inter-Domain Policy Routing Protocol
xtp     36      XTP             # Xpress Tranfer Protocol
ddp     37      DDP             # Datagram Delivery Protocol
idpr-cmtp       38      IDPR-CMTP       # IDPR Control Message Transport Proto
tp++    39      TP++            # TP++ Transport Protocol
il      40      IL              # IL Transport Protocol
ipv6    41      IPv6            # IPv6
sdrp    42      SDRP            # Source Demand Routing Protocol
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            # Resource ReSerVation Protocol
gre     47      GRE             # Generic Routing Encapsulation
mhrp    48      MHRP            # Mobile Host Routing Protocol
bna     49      BNA             # BNA