What if my Router Speed is capped at 100 Mbps?

What if my Router Speed is capped at 100 Mbps?
What if my Router Speed is capped at 100 Mbps?
2021-07-19 06:51:40 - last edited Wednesday

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 Negotiation Speed is not 1000Mbps, go to Advanced > System Tool > System Parameters, 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, or email support.forum@tp-link.com with the subject [Forum ID 270754] Speed limit to 100 Mbps. In either case, be sure to provide the following information:

1. What is the model of the 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 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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1 Accepted Solution
Re:[Troubleshooting] Speed limit to 100 Mbps-Solution
2021-08-23 13:41:39 - last edited 2021-08-24 12:33:11

@Kevin_Z  - ** SOLVED ** 

 

Mea culpa. It was the cable!

 

It was a very old one I must have grabbed from my box of bits and pieces, 

 

When I switched to one clearly marked "Cat 5E" I got a full speed connection.

 

Thank you for your help. I will pay more attention to my cable choices from now on.

 

 

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Re:[Troubleshooting] Speed limit to 100 Mbps
2021-07-19 11:11:10

@Kevin_Z 

 

I've had this problem several times with the AX11000 and wifi speed. The only way to cure the problem is reset both the modem and router and start from scratch. When it's working fine I can get the paid for speeds of 500mb but then if for whatever reason it sticks at 100 only a full hard reset will cure the problem. A restart of the router doesn't cure the issue and on a hard reset and starting from scratch the router fails to connect to the modem. Only a full reset of the modem and router cures the issue for me. I'm in the UK with virgin media and their Hub 3.

 

Steve

 

 

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Re:[Troubleshooting] Speed limit to 100 Mbps
2021-07-19 11:17:46

@soram 

 

Hi, can you please confirm what is the negotiation speed on the router web GUI when the speed drops to 100Mbps? Show us some screenshots, thanks.

 

BTW, what troubleshooting suggestions have you tried already? How long is the cable between the Hub 3 and the AX1000?

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Re:[Troubleshooting] Speed limit to 100 Mbps
2021-07-19 12:06:23
At the moment everything is fine and I am reluctant to mess around to create the problem again. When it does I will let you know and send the screen shots as requested. Cable length from the modem to the AX11000 is 7m cat 7 cable
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Re:[Troubleshooting] Speed limit to 100 Mbps
2021-08-21 16:18:10

@Kevin_Z 

 

Archer A6 v.2, firmware up to date.

Hooked up to Bell HH3000 fibre modem.

I can not get 1000mbps connection no matter what.

Tried pppoE and AP mode, never anything but 100mbps.

 

 

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Re:[Troubleshooting] Speed limit to 100 Mbps
2021-08-23 11:08:04

@makuribu 

 

Can we have the screenshot of the Negotiation speed on the A6 web as follows?

https://www.tp-link.com/support/faq/2472/

 

Try a different cat 5e or cat 6 cable between the modem and the A6 just in case it is caused by the cable. 

 

BTW, please also check the suggestions provided in the OP of this thread.

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Re:[Troubleshooting] Speed limit to 100 Mbps
2021-08-23 11:32:18

@Kevin_Z  - Thanks! 

 

I have tried switching cables, jacks on the HH3000,  and setting the negotiating speed to 1000 mbps.

 

Here's the screenshot.

 

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Re:[Troubleshooting] Speed limit to 100 Mbps
2021-08-23 11:50:56

@makuribu 

 

What're the devices connected to the LAN1 and LAN3 ports? What if you connect one of them to the Bell HH3000 fibre modem directly, will it negotiate at 1000Mbps?

 

BTW, do you buy the A6 recently, and the speed issue exists when you connect it to the network?

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Re:[Troubleshooting] Speed limit to 100 Mbps-Solution
2021-08-23 13:41:39 - last edited 2021-08-24 12:33:11

@Kevin_Z  - ** SOLVED ** 

 

Mea culpa. It was the cable!

 

It was a very old one I must have grabbed from my box of bits and pieces, 

 

When I switched to one clearly marked "Cat 5E" I got a full speed connection.

 

Thank you for your help. I will pay more attention to my cable choices from now on.

 

 

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Re:[Troubleshooting] Speed limit to 100 Mbps
2021-08-24 12:32:58

@makuribu 

 

Sounds good. We generally assume this kind of speed issue could be caused by the cable, either the cable quality or the cable connectivity would do the trick.

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Re:[Troubleshooting] Speed limit to 100 Mbps
2021-08-26 00:19:54 - last edited 2021-08-26 00:22:55

I have had an AX 50 for almost a year, 2 weeks ago it started to slow down my internet connection from 110Mbps to no more than 85 (according to fast.com and speedtest.net), at first I blamed the ISP so they checked, and even changed the modem. If I connect the modem directly to the pc I get the 110Mbps at the first second of every testing, but when I use my router it slows down

Already checked the cables, they work at 1000Mbps, I have one modem-router and another router-pc, I switched them and router-pc always has 1000 so both cables work fine.

Firmware is updated 1.0.9 Build 20200708 rel.55037(5553).

I tried a factory reset but didn't solve it, tried to set the Negotiation speed manually but it never connects to the modem (the led turn off).

Modem: Technicolor DCP3848VE fiber

 

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