Troubleshooting What if my Router Speed is capped at 100 Mbps?
This Article Applies to:
TP-Link Routers
Issue Description/Phenomenon:
Some customers may report the speed is limited to 100 Mbps when connected to the TP-Link router, while the speed is much faster and can reach up to 500+ or 900+ Mbps when connecting to the ISP modem directly. If this is what you are experiencing, follow this article to get it resolved.
Troubleshooting Suggestions:
1. Mark certain you are getting a gigabit router, which has gigabit WAN/LAN ports. Some models like Archer C20 and Archer C50 only support 10/100 Mbps WAN/LAN ports, you can find that in the product specifications here and here. If your router only has 10/100 Mbps WAN/LAN ports, you cannot get a higher speed than 100 Mbps, and you need to get a gigabit router.
2. Login to the web GUI of the router, go to Basic > Network Map > click on the Icon for TP-Link router, slide down to the bottom of the page, and you will see the Negotiation Speed of the Ethernet ports in the Ethernet part. You can refer to this article to find more detailed instructions.
3. If the Internet Port Negotiation Speed is not 1000Mbps, go to Advanced > Network > Internet page, choose 1000Mbps Full Duplex, save and reboot the router:
4. If it's still connected at 100 Mbps, try with another Cat5e/6 cable or change the port of your ISP device, where you're connecting the TP-Link router (if possible).
5. If the Internet speed is negotiated correctly at 1000 Mbps, but the LAN gets stuck at 100 Mbps, it is also suggested to try with another Cat5e/6 cable between the router LAN and the client device, try with another client device if that is possible. Follow this thread to troubleshoot further.
6. Try to reset the router to the default factory following the FAQ.
7. Upgrade the router firmware to the latest. You can follow this guide.
If the speed still gets stuck at 100 Mbps after checking all the above, it is suggested to comment below and be sure to provide the following information:
1. Model number, hardware, and firmware version of your TP-Link Router.
2. What troubleshooting have you done, and what are the results? Send us the screenshots about the Negotiation speed.
3. What are the devices that you are testing the LAN speed, and what are the models of the adapters?
4. When did you purchase the TP-Link router, and when did the issue begin to happen?
5. What is the model of the ISP modem that this TP-Link router connects to?
Related Articles:
What if my LAN speed is capped at 100 Mbps
[Solution] Killer Software lower down AX1100's Speed
How to check the negotiation speed of Ethernet ports on the TP-Link Wireless Router?
What should I do if my internet connection is slow?
How to place your wireless router for optimal reception and performance?
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@Kevin_Z
Thanks for the quick response.
Yes, if i connect to a computer it automatically negotiates as 1000mbps. My ISP( Meo Portugal) modem is a FiberGateway GR141DG.
Thanks a lot
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DiogoAbreu wrote
@Kevin_Z
Thanks for the quick response.
Yes, if i connect to a computer it automatically negotiates as 1000mbps. My ISP( Meo Portugal) modem is a FiberGateway GR141DG.
Thanks a lot
Thank you very much for your quick reply.
Is this AX72 Pro brand new, or was it working fine with the Fiber Gateway GR141DG before?
If you connect the AX72 Pro's WAN port to the gigabit LAN port, will they negotiate at 1000Mbps correctly?
If it still negotiates at 100Mbps only, I would suggest contacting the local technical support to confirm if the WAN port is faulty and if they can help with a replacement.
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Hi Kevin,
I recently received a new AX72 Pro router on Saturday and began setting it up. Unfortunately, I've been unable to achieve speeds above 100 Mbps.
The issue does not appear to be related to the ISP router port, as I have tested various configurations and ports. Here are the troubleshooting methods I’ve tried:
- Direct connection with a Cat 5e Ethernet cable – did not work.
- Direct connection with a Cat 8 Ethernet cable – did not work.
- Configuring the router as an Access Point – did not work.
- Setting port negotiation to 1000 Mbps – connection lost (tested with both 1 Gbps and 2.5 Gbps ports).
- Resetting and reconfiguring the router – did not work.
Interestingly, when I use the same configurations with an older Wi-Fi 6 Access Point (Huawei OptiXstar K562e), I immediately achieve 1000 Mbps, as indicated on the ISP router screen. However, the TP-Link router does not seem to negotiate speeds above 100 Mbps.
Please let me know if you have any additional suggestions to resolve this issue.
Best regards,
Diogo
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I apologize that I may run out of ideas why this happens but I would like to escalate the case to our support engineers for further investigation.
Please check your registered email and follow it up. Thank you.
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