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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Catch up this bug again..... with disabled one mesh
after jumping around router and 4 type cables - router up 1000mb \s for 3-4 min and drops to 100mb\s
talking with ISP - on they switch port many errors when this situations applied (they changed cable to my door)
Downgraded firmware to ax11000v1-up-ver1-1-1-P1[20200716-rel84595]_sign_2020-07-17_11.35.11 (flash + factory reset + hand configs)
1000mb\s UP momently, without drops.
continue observe for situation, by my feelings router need working about month to take bug again , idk why.
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Thank you for the update. Can I know what kind of cables are you using between the ISP modem and the AX11000 WAN, cat5e, cat6, or cat7? Please monitor the negotiation speed and let me know if the issue will be resolved or not.
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cat5e,
Same story as last time - when WAN port catch errors (internet status says "poor network" and drops to 100mb), LAN UP to 1000mb\s, and working,
In "bugtime" try connect by cat7 cable - router WAN - my PC (1000mb\s lan) - and .... it says 1000mb for 3 min and drops to 100mb\s
maybe this is due to a more aggressive way to connect to 2500mb\s? because - Lan1-Lan4 - not subject to this bug
And I want update firmware to newest.... I request WAN port reassignment to lan1 for example.
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Thank you very much for the follow-up. Please report the issue to the support engineers directly, as I can see the case had been escalated to them already months ago. They will provide further suggestions.
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router -c6 v 2.0
firmware upated
my plan is 200mbps
Tried changing the cable and setting the negotiating speed to 1000 mbps
it shows that connected lan is at 1000 mbps full duplex but still the speed is capped at 100 mbps
when moden is directly connected to laptop using the same cable(cat 6) the speed is aroung 195mbps
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Do you mean the laptop is connected to the LAN4 port with the same cat 6 cable? Try connecting another PC or laptop with a Gigabit Ethernet adapter to the LAN4 port, then confirm if it can negotiate at 1000Mbps.
It's also suggested to try with a different cat 6 cable between the router LAN port and the client device.
BTW, when did you purchase the Archer C6, and when does the issue happen? You can try resetting the router to factory defaults and connect a device to the LAN4 port again, login to its web GUI to check if it can negotiate at 1000Mbps by default.
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i purchase the router in nov 20 .
Recently i upgraded my plan to 200mbps from 100mbps and since then there has been this issue
The laptop is connected to lan 3 port and as u can see in ss attached that it shows negotiation speed at 1000mbps full duplex but still it get stuck around 100mbps.I have tried changing the cables too but no result.
I directly connected my modem to laptop and i could the get speed around 200 mbps but when connecting the modem and router the problem arises.
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@Kevin_Z I've encountered similar issue with the AX11000 and wifi speed on multiple occasions. The only method to fix the problem is to completely reset both the modem and router. When it's working well, I can receive the paid-for speeds of 500mb, but if it gets stuck at 100 for any reason, only a full hard reset will fix the problem. The issue is not resolved by restarting the router, and the router fails to connect to the modem after a hard reset. For me, the only way to fix the problem is to completely reset the modem and router. I'm in the United Kingdom, and I'm using Virgin Media's Hub 3.
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@cooking By reset you mean restore to factory or are you just rebooting both the modem and router.
I just got this to replace my Linksys and I have this dreaded 1/2 speed on the upload issue.
Literally can swap my cables back to my linksys and get full U/D on both but on the AX11000 My uplead gets cut by 70% to 300mb.
If this is what I'm in for then back to Costco this thing is going...lol
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