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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Can you confirm what do you mean by full reset? Thank you.
When the speed gets stuck at 100Mbps, how about the negotiation speed displayed on the router web GUI? Are all ports still displaying 1000Mbps negotiation speed?
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@Kevin_Z What kind of devices connected with your wifi ? does it go with 100 MPS ?
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I had the same problem. I Tested many things but nothing worked.
sometimes such issues occur due to some software error. Resetting the router to its default state always works for me. I found this tp-link router reset guide on Google. You can also follow some others, there are various guides available for it. .
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Hello, i have the same problem.
I tried 3 different cables (6a) and nothing is helping. My WAN port is locked on 100Mbps:
I tried to change negotiation speed setting, but when i set it 1000 instead of Auto negotiation it can't find any internet connection (i tried to reset my router, but it silk can't find internet connection, so i setted it back to Auto Negotiation):
My router is AX1500 and i think everything was fine with it for last months.
I tried to reset it multiple times, change cables but speed is locked at 100Mbps. When i connect my laptop directly to modem speed is higher than 300Mbps.
Firmware Version:
1.2.5 Build 20220117 Rel. 51891(4555)
Any other ideas what can i do?
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Hello @Daisuke93, can I have the model of the modem you are using with the AX1500? BTW, what is the model and hardware version printed on the router bottom sticker? Is it AX1500 or AX10?
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Daisuke93 wrote
Thanks for the follow-up @Daisuke93. To assist and figure it out efficiently, I've forwarded your case to the TP-Link support engineers who will contact you with your registered email address later. Please pay attention to your email box for follow-up. Thank you.
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@Kevin_Z try this one= https://productz.com/en/tp-link-archer-c50/p/B3pKq
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@Kevin_Z I'm having the same problem , with Archer C80. ITS NOT THE CABLES... I reboot, disconnect/reconnect the ethernet, gets 1000mb, then after a few mintutes its back to 100mb... Can be solved by a hand of god later, and return after a couple of days.
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