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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If you have done all we suggested but issue cannot get resolved, we recommend reaching out to the local tech support, so they can work with you in looking into the issue further or help with the replacement.
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Same trouble, after updating to OneMesh (and same on last firmware on AX11000) i get this problem, some times wan port in Auto negotiation drop to 100mb\s and hold it, if I put by hands 1000mb\s - it says port unplugged, AND if I put THIS CABLE on Lan1-Lan8 - IT's momently say - 1000mb\s. Only plug\unplug wan port many times help.
on firmwares BEFORE onemesh - never seen.
if such a problem exists only on wan, can you do that the port can be selected Lan1 for Internet?
AX11000
Firmware Version:
1.2.3 Build 20210719 rel.14861(4555)
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We will still suggest you try with a different cable between the modem and the AX11000 first to confirm if that will help.
Can we know the model of the ISP modem, please? To locate this issue and try to fix it, we would like to follow up on your case via email. Please check your inbox and provide the information that we need.
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ISP - MTS RUS, Ethernet port (1Gb\s) from ISP in apartments.
Connection type - Dynamic IP
Router - AX11000 EU v1.0
Wan port - auto negotiation
===
To remove the wan port from 100 mb / s - 3 reboots, with power off, un-plugging the cable 3-4 times. By defaults - router plugged by 8m cat 5e cable. I testing various cable, like 1m cat6, self-made path cord and supplied cable from router box (for shorts cables - I take router closer to ISP port).
If I plug all cables in Lan1 port at moment when "wan-bug" - always show 1gb\s connection.
This bug I have about 2-3 times after flashing to OneMesh and above. Before router working about 1 year without problems (reboot by Mondays every week by schedule).
IDK why it happened, found no dependency. Only one thing was changed - firmware.
If I connect WDR4300 in "bug-time" - his WAN port in 1gb\s state, re-plug to AX11000 - says 100mb\s
Because I won't 100mb on WAN - I always do procedure from above, but i think is not normal.
Speedtests from web-interface says:
when port on 100mb\s = 92.03 Mbps 93.05 Mbps
when normal 1gb\s = 776.19 Mbps 669.65 Mbps
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Thanks again for all the details. The support engineer will contact you via email to troubleshoot further, please check the email and follow it up.
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Hello,
When I connect the ethernet cable directly to my laptop the internet speed is 150 Mbps. But when I connect the cable into my Archer 1200 router, the internet speed is reduced to less than 100 Mbps. How can I change the negotiation speed of internet. Thank you!
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Are you submitting a support ticket via email? If yes, please follow up with the email, and you may update here once the issue is confirmed.
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About my case, i tired off onemesh function, and - no negotiations lock on wan port after this manipulation. (without downgrade firmware or cable changes)
I continue observ for situation, now it looks normal, with disabled onemesh. If need i can test enable it.
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https://community.tp-link.com/en/home/forum/topic/192286?replyId=548668&utm_source=Subscription&utm_medium=email
My question has been fixed
If you plan to use Qos to control the upload and download speed, it is not recommended
Because enable QoS must turn off "Enable NAT Boost", after turning off "Enable NAT Boost"
your upload/download speed can only be up to 200-300Mbps
In summary, you must turn on "Enable NAT Boost" to reach the maximum speed of about 900Mbps
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