Appendix 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

RFC2406

 

 

Payload

 

 

51

AH

Authentication Header

RFC2402

108

IPComp

I IP

Payload

Compression

RFC2393

 

 

Protocol

 

 

112

VRRP

Virtual

Router

Redundancy

 

 

 

Protocol

 

 

115

L2TP

Layer Two Tunneling Protocol

 

Source: http://www.iana.org/assignments/protocol-numbers

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D-Link DFL-700 manual Appendix B Common IP Protocol Numbers, Esp