3Com 3C13636 Configuration Manual page 1246

Router 3000 ethernet family

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3Com Router 3000 Ethernet Family

Configuration Guide

In the above figure, Group1 and Group2 are the local networks employing the Novell

IPX protocol; Term1 and Term2 are the local networks running IP. By setting up a GRE

tunnel between Router A and Router B, you can allow Group1 to communicate with

Group2 and Term1 with Term2 without interfering with each other.

Expanding the operating area of networks running hop-limited protocols (e.g. IPX)

Figure 3-5 Expanding network operating area

If the hop count between two terminals in the above figure is more than 15, the two

terminals cannot communicate with each other. By setting up a tunnel across the

network, some hops can be hidden, thus expanding the operating area of the network.

Connecting some discontinuous sub-networks to establish VPN

Figure 3-6 Tunnel connecting discontinuous sub-networks

Sub-networks group1 and group2 running Novell IPX are in different cities but they can

form a VPN over WAN by using a tunnel.

The use in conjunction with IPSec

Figure 3-7 GRE-IPSec tunnel application

As illustrated in the above figure, GRE can encapsulate multicast data and transmit the

data through the GRE tunnel. As provisioned, IPSec can only protect unicast data at

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IPSec Tunnel

Chapter 3 Configuration of GRE

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3c13636-us - router 3036 3000 series