12.1 GRE Troubleshooting
This section describes how to troubleshoot common GRE faults and provides sample
troubleshooting scenarios in the following sections.
12.1.1 Failed to Ping the IP Address of the Remote Tunnel Interface
Common Causes
This fault is commonly caused by one of the following:
l Interfaces on both ends of a tunnel use different tunnel encapsulation modes.
l No IP address is assigned to interfaces on either end, or no tunnel source or destination
address is configured on the two interfaces.
l No reachable route exists between the tunnel source and destination addresses.
Troubleshooting Flowchart
After each device is configured as shown in Figure 12-1, PC1 and PC2 cannot communicate.
To rectify the fault, follow the troubleshooting flowchart shown in Figure 12-2.
Figure 12-1 GRE networking diagram
RouterA
RouterB
RouterC
Tunnel
PC1
10.1.1.1/24
PC2
10.2.1.1/24
Huawei AR2200-S Series Enterprise Routers
Troubleshooting 12 VPN
Issue 01 (2012-01-06) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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