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305753-A Rev 00

1-1

Chapter 1

Introduction

The following topics introduce concepts and terminology used in this guide:

Generic Routing Encapsulation (GRE)

Generic Routing Encapsulation (GRE) is a protocol that allows transport of

non-IP traffic through IP-based systems. GRE, which is defined in RFCs 1701 and

1702, encapsulates Internet Protocol (IP) and other layer 3 protocols to enable

data transmission through an IP tunnel. This tunneling mechanism allows:

• Transport of non-IP traffic through intermediate systems that support only IP

• Creation of a virtual private network (VPN) that uses the Internet as a section

of your own private network

• Communication between subnetworks with unregistered or discontiguous

network addresses

Topic Page

Generic Routing Encapsulation (GRE) 1-1

Network Address Translation (NAT) 1-2

Revised IP Security Option (RIPSO) 1-3

Blacker Front End (BFE) 1-4

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 179 180

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