How to Troubleshoot GRE Tunnels
The Generic Router Encapsulation (GRE) protocol is used to allow network administrators the ability to transport packets over two different routers. This protocol is also used with Point To Point Tunneling Protocol and Virtual Private Networking. If you are having problems with your GRE tunnel, there are a few things that you can do to get your two routers working properly. You don’t have to be a computer genius to troubleshoot the problem. You can configure the GRE tunnel yourself.
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Instructions
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Router 1 Interface
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1
Log into the first router as specified by the manufacturer.
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2
Click on the “Ethernet0/1” icon and make sure that the IP address is set to “10.2.2.1” and the MAC address is set to “255.255.255.0.”
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3
Click on the “Serial0/0” icon, then make sure that the IP address is set to “192.186.4.1.” Make sure that the MAC address is set to “255.255.255.0.”
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4
Click on the “Tunnel0” icon and make sure that the IP address is set to “1.1.1.2” and the MAC address is set to “255.255.255.0.”
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5
Click on the “Serial0/0 Tunnel Destination” and make sure that the IP address is set to “192.168.4.2.” Save your changes.
Router 2 Interface
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6
Log into the second router as specified by the manufacturer.
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7
Click on the “Ethernet0/1” icon, then make sure that the IP address is set to “10.1.1.1” and the MAC address is set to “255.255.255.0.”
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8
Click on the “Serial0/0” icon, then make sure that the IP address is set to “192.186.4.2.” Make sure that the MAC address is set to “255.255.255.0.”
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9
Click on the “Tunnel0” icon and make sure that the IP address is set to “1.1.1.1” and the MAC address is set to “255.255.255.0.”
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10
Click on the “Serial0/0 Tunnel Destination” and make sure that the IP address is set to “192.168.4.1.” Save your changes.
General Troubleshooting
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11
Check over the ethernet cable coming into the GRE tunnel hardware. The main ethernet cable should be bringing the Internet signal into the GRE tunnel hardware's "Internet" port.
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12
Check the ethernet cables connecting Router 1 and Router 2 to the GRE tunnel. Make sure that they are plugged into the Router 1 and Router 2 ethernet ports on the hardware.
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13
Make sure that the GRE tunnel hardware is connected to the Internet. Go to the front of the hardware where you see "Internet." There should be a solid light. If the light is blinking, you are not online. Check the main ethernet cable again to make sure that it is plugged in properly.
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14
Check the wireless routers, if you are using them, to make sure that they are broadcasting the signals. Log into your routers and check the box next to "SSID Broadcast." This will turn on the wireless Internet.
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15
Reinstall the ethernet software for your computer if you still can't connect to the network. You can do this by right clicking on your ethernet controller in the "Device Manager." Click on the "Update Driver" icon to reinstall the driver needed for your ethernet controller.
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