An Example Of Gre Usage - D-Link NetDefendOS User Manual

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The same is true for traffic in the opposite direction, that is, going into a GRE tunnel. Furthermore

a Route has to be defined so NetDefendOS knows what IP addresses should be accepted and

sent through the tunnel.

An Example of GRE Usage

The diagram below shows a typical GRE scenario, where two NetDefend Firewalls labeled A and

B must communicate with each other through the intervening internal network 172.16.0.0/16.

The setup for the two firewalls are described next.

Any traffic passing between A and B is tunneled through the intervening network using a GRE

tunnel. Since the network is internal and not passing through the public Internet, there is no

need for encryption.

Part 1. Setup for NetDefend Firewall A

Assuming that the network 192.168.10.0/24 is lannet on the lan interface, the steps for setting up

NetDefendOS on A are:

In the address book set up the following IP objects:

remote_net_B: 192.168.11.0/24

remote_gw: 172.16.1.1

ip_GRE: 192.168.0.1

Create a GRE Tunnel object called GRE_to_B with the following parameters:

IP Address: ip_GRE

Remote Network: remote_net_B

Remote Endpoint: remote_gw

Figure 3.5. An Example of GRE Usage

Chapter 3: Fundamentals

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