If an Internet or LAN port isn’t working correctly on your router, you can use an Ethernet cable to perform a loopback test and check the port.
You might want to perform a loopback test if you are experiencing any of the following symptoms:
- You experience connection issues with specific ports on your router
- Your
(Internet) or LAN LEDs are not lit when Ethernet cables are connected
- Your devices can’t get an IP address when connected to a LAN port
- Your router can’t get an Internet IP address when connected to a modem
To perform a loopback test to check an Internet or LAN port on your router:
- Connect the power adapter to your router and plug the power adapter into an electrical outlet.
- Turn on the router and wait for the Power LED to light solid green or white.
- Using an Ethernet cable, connect one end to the LAN port that you want to test and connect the other end to the Internet port.
Some routers might use a WAN port label instead of Internet.
In the following example, the Internet port and LAN 2 port are connected.
- Check the LEDs. If the LAN LED for the connected port and the Internet LED both light, the ports should work correctly.
The LEDs might light amber instead of green or white, and some routers might reboot a few seconds after the LEDs light.
In the following example, the LAN 2 LED and Internet LED are both lit, indicating that both ports should work correctly.
- Repeat steps 3 and 4 for each LAN port that you want to test.
If the LAN or Internet LED does not light for a port, that port might be faulty.
If all your router’s ports pass the loopback test, but you still experience issues when you connect devices via Ethernet, you might have a faulty Ethernet cable in your network, or you might have other network problems.
Last Updated:08/07/2023
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Article ID: 28408