Chapter 7 Firewall for FortiOS 5.0 : Firewall objects : Services and TCP ports : Protocol Types : Protocol Number
  
Protocol Number
IP is responsible for more than the address that it is most commonly associated with and there are a number of associated protocols that make up the Network Layer. While there are not 256 of them, the field that identifies them is a numeric value between 0 and 256.
In the Internet Protocol version 4 (IPv4) [RFC791] there is a field called “Protocol” to identify the next level protocol. This is an 8 bit field. In Internet Protocol version 6 (IPv6) [RFC2460], this field is called the “Next Header” field.
Table 48: Protocol Numbers
#
Protocol
Protocol's Full Name
0
HOPOPT
IPv6 Hop-by-Hop Option
1
ICMP
Internet Control Message Protocol
2
IGMP
Internet Group Management
3
GGP
Gateway-to-Gateway
4
IPv4
IPv4 encapsulation Protocol
5
ST
Stream
6
TCP
Transmission Control Protocol
7
CBT
CBT
8
EGP
Exterior Gateway Protocol
9
IGP
Any private interior gateway (used by Cisco for their IGRP)
10
BBN-RCC-MON
BBN RCC Monitoring
11
NVP-II
Network Voice Protocol
12
PUP
PUP
13
ARGUS
ARGUS
14
EMCON
EMCON
15
XNET
Cross Net Debugger
16
CHAOS
Chaos
17
UDP
User Datagram Protocol
18
MUX
Multiplexing
19
DCN-MEAS
DCN Measurement Subsystems
20
HMP
Host Monitoring
21
PRM
Packet Radio Measurement
22
XNS-IDP
XEROX NS IDP
23
TRUNK-1
Trunk-1
24
TRUNK-2
Trunk-2
25
LEAF-1
Leaf-1
26
LEAF-2
Leaf-2
27
RDP
Reliable Data Protocol
28
IRTP
Internet Reliable Transaction
29
ISO-TP4
ISO Transport Protocol Class 4
30
NETBLT
Bulk Data Transfer Protocol
31
MFE-NSP
MFE Network Services Protocol
32
MERIT-INP
MERIT Internodal Protocol
33
DCCP
Datagram Congestion Control Protocol
34
3PC
Third Party Connect Protocol
35
IDPR
Inter-Domain Policy Routing Protocol
36
XTP
XTP
37
DDP
Datagram Delivery Protocol
38
IDPR-CMTP
IDPR Control Message Transport Proto
39
TP++
TP++ Transport Protocol
40
IL
IL Transport Protocol
41
IPv6
IPv6 encapsulation
42
IPv6
SDRPSource Demand Routing Protocol
43
IPv6-Route
Routing Header for IPv6
44
IPv6-Frag
Fragment Header for IPv6
45
IDRP
Inter-Domain Routing Protocol
46
RSVP
Reservation Protocol
47
GRE
General Routing Encapsulation
48
DSR
Dynamic Source Routing Protocol
49
BNA
BNA
50
ESP
Encap Security Payload
51
AH
Authentication Header
52
I-NLSP
Integrated Net Layer Security TUBA
53
SWIPE
IP with Encryption
54
NARP
NBMA Address Resolution Protocol
55
MOBILE
IP Mobility
56
TLSP
Transport Layer Security Protocol using Kryptonet key management
57
SKIP
SKIP
58
IPv6-ICMP
ICMP for IPv6
59
IPv6-NoNxt
No Next Header for IPv6
60
IPv6-Opts
Destination Options for IPv6
61
 
any host internal protocol
62
CFTP
CFTP
63
 
any local network
64
SAT-EXPAK
SATNET and Backroom EXPAK
65
KRYPTOLAN
Kryptolan
66
RVD
MIT Remote Virtual Disk Protocol
67
IPPC
Internet Pluribus Packet Core
68
 
any distributed file system
69
SAT-MON
SATNET Monitoring
70
VISA
VISA Protocol
71
IPCV
Internet Packet Core Utility
72
CPNX
Computer Protocol Network Executive
73
CPHB
Computer Protocol Heart Beat
74
WSN
Wang Span Network
75
PVP
Packet Video Protocol
76
BR-SAT-MON
Backroom SATNET Monitoring
77
SUN-ND
SUN ND PROTOCOL-Temporary
78
WB-MON
WIDEBAND Monitoring
79
WB-EXPAK
WIDEBAND EXPAK
80
ISO-IP
ISO Internet Protocol
81
VMTP
VMTP
82
SECURE-VMTP
SECURE-VMTP
83
VINES
VINES
84
TTP
TTP
84
IPTM
Protocol Internet Protocol Traffic
85
NSFNET-IGP
NSFNET-IGP
86
DGP
Dissimilar Gateway Protocol
87
TCF
TCF
88
EIGRP
EIGRP
89
OSPFIGP
OSPFIGP
90
Sprite-RPC
Sprite RPC Protocol
91
LARP
Locus Address Resolution Protocol
92
MTP
Multicast Transport Protocol
93
AX.25
AX.25 Frames
94
IPIP
IP-within-IP Encapsulation Protocol
95
MICP
Mobile Internetworking Control Pro.
96
SCC-SP
Semaphore Communications Sec. Pro.
97
ETHERIP
Ethernet-within-IP Encapsulation
98
ENCAP
Encapsulation Header
99
 
any private encryption scheme
100
GMTP
GMTP
101
IFMP
Ipsilon Flow Management Protocol
102
PNNI
PNNI over IP
103
PIM
Protocol Independent Multicast
104
ARIS
ARIS
105
SCPS
SCPS
106
QNX
QNX
107
A/N
Active Networks
108
IPComp
IP Payload Compression Protocol
109
SNP
Sitara Networks Protocol
110
Compaq-Peer
Compaq Peer Protocol
111
IPX-in-IP
IPX in IP
112
VRRP
Virtual Router Redundancy Protocol
113
PGM
PGM Reliable Transport Protocol
114
 
any 0-hop protocol
115
L2TP
Layer Two Tunneling Protocol
116
DDX
D-II Data Exchange (DDX)
117
IATP
Interactive Agent Transfer Protocol
118
STP
Schedule Transfer Protocol
119
SRP
SpectraLink Radio Protocol
120
UTI
UTI
121
SMP
Simple Message Protocol
122
SM
SM
123
PTP
Performance Transparency Protocol
124
ISIS over IPv4
 
125
FIRE
 
126
CRTP
Combat Radio Transport Protocol
127
CRUDP
Combat Radio User Datagram
128
SSCOPMCE
 
129
IPLT
 
130
SPS
Secure Packet Shield
131
PIPE
Private IP Encapsulation within IP
132
SCTP
Stream Control Transmission Protocol
133
FC
Fibre Channel
134
RSVP-E2E-IGNORE
 
135
Mobility Header
 
136
UDPLite
 
137
MPLS-in-IP
 
138
manet
 
139
HIP
 
140
Shim6
 
141
WESP
 
142
ROHC
 
143 − 252
Unassigned
Unassigned
253
 
Use for experimentation and testing
254
 
Use for experimentation and testing
255
Reserved
 
Further information can be found by researching RFC 5237.