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?
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thanks for your response, I guess TP Link lied to its customers by advertising speeds 5 GHz: 1300 Mbps (802.11ac)
2.4 GHz: 450 Mbps (802.11n) for the Archer C59 V1.
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@Kevin_Z it is clear that there is a BIG problem with this router. It is not a matter to update, change cables.... it is a BUG in the system. Unfortunately looks TPlink doesn't know how to solve it. In my case, every time that I turn on my router, I check the speed, if it is 100mb, I reboot the router and then it adjusts to 1gb automatically. Sometimes the reboot is not necessary sometimes it is.
So, please go deeper in the trouble shooting with the tech team and fix it. It is not a customer configuration or installation problem, it is a TPLINK problem.
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@Kevin_Z Could you help me with 100 mbps speed cap issue. Thank you.
1. What is the model of the TP-Link router?:
Archer C60 (US) AC1350 wireless dual band router
2. What troubleshooting have you done, and what are the results? Send us the screenshots about the Negotiation speed.
There is no 1000mpbs negotion speed listed
I also connected my laptop to the cat 5E cable that was connected from modem to TP link router and I was getting 250mbps speed, so there is not LAN cable issue between Modem and TPLink router
3. What are the devices that you are testing the LAN speed, and what are the models of the adapters?
Windows HP Laptop
IOS iPhone
4. When did you purchase the TP-Link router, and when did the issue begin to happen?
Purchase date: 04-Oct-2020
Issue begin date: Don’t know, I tried to use it from Sept 26th 2022 for 200 mbps, earlier to that I was using only 100 mbps so I didn’t encounter this issue.
5. What is the model of the ISP modem that this TP-Link router connects to?
Router details: Nokia
Model: G-2425G-A
ISP: Airtel
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I'm having an odd situation where I'm trying to replace an old tp-link N600 with a tp-link Archer AX-20. Using the N600, I'm getting a 100Mbps connection. With the N600 - I'm getting a 1000Mbps connection - all with the same cabling. When I tried to change the negotiation speed from 'auto' to 1000Mbps duplex - I get an error connecting.
I've described the issue (with screenshots) in this post: https://community.tp-link.com/en/home/forum/topic/594738?page=1
What I can't make sense of is why an older router makes it work - and a newer one doesn't - with the exact same setup...
Any tips?
Thanks.
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BugoK wrote
I'm having an odd situation where I'm trying to replace an old tp-link N600 with a tp-link Archer AX-20. Using the N600, I'm getting a 100Mbps connection. With the N600 - I'm getting a 1000Mbps connection - all with the same cabling. When I tried to change the negotiation speed from 'auto' to 1000Mbps duplex - I get an error connecting.
I've described the issue (with screenshots) in this post: https://community.tp-link.com/en/home/forum/topic/594738?page=1
What I can't make sense of is why an older router makes it work - and a newer one doesn't - with the exact same setup...
Any tips?
Thanks.
@BugoK Thank you very much for bringing this up to our attention.
I'm checking your post now. We can discuss it there.
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Hi guys , i have a problem and i don`t know how to solve it , i did all the ways possible and still not working , so from my modem in my router i have 1000 mbps , but in LAN , from the router in my pc i have 100 mbps , i just bought a new 5e cable and it`s still the same , i changed the internet port negotiation speed in my router and in my pc both to 1000 mbps and it`s still showing link speed 100 mbps on pc , what can i do ?
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Males wrote
Hi guys , i have a problem and i don`t know how to solve it , i did all the ways possible and still not working , so from my modem in my router i have 1000 mbps , but in LAN , from the router in my pc i have 100 mbps , i just bought a new 5e cable and it`s still the same , i changed the internet port negotiation speed in my router and in my pc both to 1000 mbps and it`s still showing link speed 100 mbps on pc , what can i do ?
Hello @Males
If it is the LAN negotiation speed is capped at 100Mbps, please try referring to this thread for some basic suggestions instead.
BTW, what is the model number of the TP-Link device?
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I have an AX73 AX5400
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If the Internet negotiation speed still shows as 100Mbps after changing the duplex to 1000Mbps, make sure to 'reboot' the router by clicking the 'Reboot' button at the top-right of
the UI 
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