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:
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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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Hi! Does this apply to the Omada Load Balance Router? I have an Omada connected to an M9 mesh router. The Wi-Fi speed is fine, but I'm experiencing limited speeds of 100Mb when using a cable connection. The QoS on the M9 is already configured for 1000Mb.
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Hello!
Currently, I am experiencing a speed limitation when using a wired connection with a Cat5e cable. When I connect my MacBook Pro to the router via cable, the maximum speed I can achieve is only 100 Mbps. However, when I use the Wi-Fi connection, the speed reaches 600 Mbps.
I have already followed all the suggested configurations and troubleshooting steps mentioned in the forum to address this issue. I have checked the router's specifications and confirmed that it has gigabit WAN/LAN ports. Furthermore, in the router's web interface, I have verified the "Negotiation Speed" of the Ethernet ports, and all of them are correctly set to 1000 Mbps.
I have also tested different Cat5e cables and attempted to connect my MacBook Pro to other available ports on the router, but the speed remains limited to 100 Mbps when connected via cable.
I kindly request your assistance in resolving this speed limitation issue. Please provide additional guidance or any solutions that may help rectify this matter.
Here are the relevant details for your analysis:
- Main router model: TP-Link Omada Gigabit Multi-WAN VPN Router.
- Connected Mesh router: TP-Link Mesh M5.
- When using Wi-Fi, the speed is approximately 600 Mbps.
- When using a Cat5e cable, the maximum speed is limited to 100 Mbps.
- All the settings suggested in the forum have been checked and applied.
- My device is a MacBook Pro.
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Hi @Rgood68
Is the model of the Multi-WAN VPN Router ER605? How is the network layout? Does the MacBook Pro connect to the ER605 LAN or to the Deco M9?
How long is the cable between the two? Try a shorter cable and ensure the cable quality is good.
If possible, I would suggest testing the LAN speed with another computer or device with a gigabit Ethernet port, which will help address if this is related to the router or the MacBook Pro itself.
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What is the specific model number of the AC1200? You can find it on the device's bottom sticker.
Can you please show us the negotiation speed on the AC1200 web page as stated in my original post? If possible, please try with a new cat 5e or cat 6 cable, just in case there is anything wrong with the cable when working with the router.
You can also try resetting the router to factory defaults to exclude all possible settings that may affect the speed.
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Hi, I have a 500 down/ 50 up plan with Cox. If I connect my PS5 directly to my cable modem I'm able to get the full 500 down but when I use either the ethernet port or a 5GHz wifi connection on my TP-Link AC1200 V2, I'm only getting between 100-150 down. Have also tried running a speedtest on my phone and Macbook on the 5Ghz network, only to get the same results. In any case, here are the things I've already tried:
-Switching ethernet cables
-Switching ethernet ports
-Keeping QoS on and changing download speed to "500"
-Turning off QoS and Parental Controls entirely
-Changing the Duplex mode from "Automatic" to "1000/Full Duplex"
The router page/tp-link cloud is telling me there are no firmware updates available, although I am noticing that the current firmware version is "2.0.2 Build 20180117 rel.70858 (US)", which seems like it's old (with respect to what I see here)
Not really sure where else to go from here. I should also point out that if I go to Basic -> Network Map -> click on the router, I don't see a table for Ethernet negotiation speeds anywhere.
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Sorry that I missed your response.
Can I have the hardware version and region version of your Archer C1200? Is it an EU version or a US? If yours is a US version, you can download and install the latest version from the website as you linked:
https://www.tp-link.com/us/support/download/archer-c1200/v2/#Firmware
You can also try resetting the router to factory defaults and don't modify any advanced settings (QoS or Parental Control or anything), just connect it to the modem and get online, then test the internet speed first to see if that is normal. If yes, then try to modify the settings as required one by one to observe which one may affect the internet speed.
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So I have a V2 (US) and I upgraded the firmware according to the latest one in your link and no dice. However, I did notice in the system parameters that NAT boost was unchecked. Since I already had QoS off, I only had to turn off the Traffic Statistics and then reboot the router to enable the NAT boost. This jumped my wireless speed up to around 400 down, which is a lot closer. My question for you is - is there any downside to me disabling the Traffic Statistics in order for me to get these higher speeds?
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Good try. You can enable NAT Boost to get a better speed.
Disabling Traffic Statistics won't affect the functions or features of the router, but you can no longer monitor the volume of internet traffic statistics.
Here is a story that explains why these features cannot be enabled simultaneously, please have a check.
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@Kevin_Z hey, i;m too getting the speed capped at 100mbps, i've already tried all the suggestions but nothing seems to fix it.
and if i change the negotiation speed from auto to 1000mbps full duplex, the speeds gets capped at 10mbps. dont know why
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