Browse Prior Art Database

IP in IP Tunneling (RFC1853)

IP.com Disclosure Number: IPCOM000004109D
Original Publication Date: 1995-Oct-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 6 page(s) / 14K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

W. Simpson: AUTHOR

Abstract

This document discusses implementation techniques for using IP Protocol/Payload number 4 Encapsulation for tunneling with IP Security and other protocols.

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 20% of the total text.

Network Working Group W. Simpson

Request for Comments: 1853 Daydreamer

Category: Informational October 1995

IP in IP Tunneling

Status of this Memo

This memo provides information for the Internet community. It does

not specify an Internet standard. Distribution of this memo is

unlimited.

IESG Note:

Note that this memo is an individual effort of the author. This

document reflects a current informal practice in the internet. There

is an effort underway within the IETF Mobile-IP Working Group to

provide an appropriate proposed standard to address this issue.

Abstract

This document discusses implementation techniques for using IP

Protocol/Payload number 4 Encapsulation for tunneling with IP

Security and other protocols.

Table of Contents

1. Introduction .......................................... 2

2. Encapsulation ......................................... 3

3. Tunnel Management ..................................... 5

3.1 Tunnel MTU Discovery ............................ 5

3.2 Congestion ...................................... 6

3.3 Routing Failures ................................ 6

3.4 Other ICMP Messages ............................. 6

SECURITY CONSIDERATIONS ...................................... 7

REFERENCES ................................................... 7

ACKNOWLEDGEMENTS ............................................. 8

AUTHOR'S ADDRESS ............................................. 8

1. Introduction

The IP in IP encapsulation Protocol/Payload number 4 [RFC-1700] has

long been used to bridge portions of the Internet which have disjoint

capabilities or policies. This document describes implementation

techniques used for many years by the Amateur Packet Radio network

for joining a large mobile network, and also by early implementations

of IP Security protocols.

Use of IP in IP encapsulation differs from later tunneling techniques

(for example, protocol numbers 98 [RFC-1241], 94 [IDM91a], 53

[swIPe], and 47 [RFC-1701]) in that it does not insert its own

special glue header between IP headers. Instead, the original

unadorned IP Header is retained, and simply wrapped in another

standard IP header.

This information applies principally to encapsulation of IP version

4. Other IP versions will be described in separate documents.

2. Encapsulation

The encapsulation technique is fairly simple. An out...