Chapter 24. Gre; Gre Configuration Examples - Samsung Ubigate iBG3026 Configuration Manual

Ubigate iBG3026 Configuration Guide
CHAPTER 24. GRE
Generic Routing Encapsulation(GRE) is a standards-based(RFC1701,
RFC2784) tunneling protocol that can encapsulate a wide variety of protocol
packet types inside IP tunnels, creating a virtual point-to-point link between
routers at remote points over an IP network. A tunnel is a logical interface that
provides a way to encapsulate passenger packets inside a transport protocol.
Tunnels can be created using GRE(the default) or IPIP.
By connecting multiprotocol subnetworks in a single-protocol backbone
environment, IP tunneling using GRE allows network expansion across a
single-protocol backbone environment.
IPSec and GRE complement each other well, while IPSec provides a secure
method of transporting data across the internet GRE provides the capability to
transport routing protocols(for example: OSPF) that use broadcast and
multicast.

GRE Configuration Examples

This example explains how to configure a basic GRE tunnel as shown in
Figure 24.1.
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