19216811.liveAppendix B: Common IP Protocol Numbers
These are some of the more common IP Protocols, for all follow the link after the table.
Decimal
Keyword
Description
Reference
1
ICMP
Internet Control Message
RFC792
2
IGMP
Internet Group Management
RFC1112
3
GGP
Gateway-to-Gateway
RFC823
4
IP
IP in IP (encapsulation)
RFC2003
5
ST
Stream
RFC1190, RFC1819
6
TCP
Transmission Control
RFC793
8
EGP
Exterior Gateway Protocol
RFC888
17
UDP
User Datagram
RFC768
47
GRE
General
Routing
Encapsulation
50
ESP
Encapsulation
Security
Payload
RFC2406
51
AH
Authentication Header
RFC2402
108
IPComp
I IP Payload Compression
Protocol
RFC2393
112
VRRP
Virtual
Router
Redundancy
Protocol
115
L2TP
Layer Two Tunneling Protocol