Figure 1-2 Networking diagram of GRE-IPSec tunnel application
IPSec tunnel
GRE tunnel
Internet
Corporate
intranet
Remote
office
network
As shown in Figure 1-2, if the multicast data is transmitted in the IPSec tunnel, establish the
GRE tunnel and encapsulate the multicast data with GRE. Then encrypt the encapsulated
multicast data with IPSec. When these tasks are performed, the encrypted multicast data can be
transmitted in the IPSec tunnel.
1.3 Configuring GRE
You can configure GRE only after a GRE tunnel is configured.
1.3.1 Establishing the Configuration Task
Before configuring a GRE tunnel, familiarize yourself with the applicable environment,
complete the pre-configuration tasks, and obtain the data required for the configuration.
Applicable Environment
To set up a GRE tunnel, create a tunnel interface first, and configure the GRE functions on the
tunnel interface. If the tunnel interface is deleted, all the configurations on the interface are
deleted.
Pre-configuration Tasks
Before configuring an ordinary GRE tunnel, complete the following task:
l Configuring reachable routes between the source and destination interfaces
Data Preparation
To configure an ordinary GRE tunnel, you need the following data.
No.
Data
1 Number of the tunnel interface
2 Source address and destination address of the tunnel
Huawei AR1200 Series Enterprise Routers
Configuration Guide - VPN 1 GRE Configuration
Issue 01 (2012-04-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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