Question Slow Ethernet speed

[sshorab]

My Router ethernet speed is really slow, when I use FAST.com to measure the speed it hovers around 500 kbps or less. But weirdly the upload speed is 40 Mbps. Furthermore when I connect to the Wi-Fi the internet speed is normal as usual. What could be the cause for the slow speed on my ethernet?


Router D-link DIR-600M
Hardware version:C1
Firmware version: 3.08

 

[Tech Junky]

So, let's start with the fact this is running N and not even AC let alone AX at this point it's probably time to replace it with something more recent as DLINK doesn't even have a page for it on their site any longer.

fast.com isn't the end all be all of speed testing though and probably the least informative option out there. Look for something that does HTML5 like speakeasy.net

So, your UL is a million times faster than your DL. I ran into this recently with my server with a AX210 WIFI card running Linux and it baffled me but, I found a workaround to disable the AX brought the DL speed up from 6mps to 866mbps which is the top end for AC. Without it disabled though the UL speed was gig+

What machine / os / wifi card / etc. makes a difference. When you bypass the DLINK are your speeds what you expect? If they're still slow then it's probably with the ISP or the PC you're using.

Internet Speed Test

Test your internet speed instantly with TestMySpeed, the leading broadband speed test. Get real-time results for download, upload, and ping.

www.testmyspeed.com

Give them a shot for testing and bypass the DL and also test while plugged in to see if there's a difference.

 

[VirtualLarry]

Your ethernet cable likely needs to be replaced.

I'll also second that that router sounds old and in need of replacement as well. Shouldn't be running anything older than "AC" / wifi 5, unless you have special requirements ("legacy" hardware need access).

 

[ch33zw1z]

Use iperf to test LAN, don’t rely on WAN tests to test local connections

 

[sshorab]

Thank you all for the kind info's.

My ethernet cable is pretty new, I've purchased it recently. I've tried all measures there is, most likely my router is pretty old and in need of replacement. The LAN ports are all acting the same way regardless of what I try. Probably the LAN ports are faulty or something.

Thanks again all.

 

[mxnerd]

Did you check ethernet adapter's speed?

How to check Network Adapter Speed on Windows 11/10

Use built-in tools to check the speed of your Internet instead of using third-party applications on Windows 11/10.

www.thewindowsclub.com

Mine

 

[mxnerd]

Also reset Windows network see if it helps.

 

[sshorab]

Ok, I've just installed a brand new router but I'm facing the same issue.

New router is
Tenda AC5 AC1200

 

[sshorab]

Yes, it's showing 100 mbps.

 

[Tech Junky]

So, the cable & router have been swapped which leaves the NIC. If the NIC isn't gigabit then that explains the 100mbps link but, if it is gigabit then there's some issue with it whether physical or driver.

 

[mxnerd]

So, the cable & router have been swapped which leaves the NIC. If the NIC isn't gigabit then that explains the 100mbps link but, if it is gigabit then there's some issue with it whether physical or driver.

His Tenda is 100Mbps only

AC5 _Tenda-All For Better NetWorking

AC5

www.tendacn.com

 

[Tech Junky]

@mxnerd

Slacker!

 

[mikeymikec]

In Device Manager, advanced settings for the NIC, try forcing the link speed. I'd start with 10 full and work up.

I've seen an issue occasionally with certain NICs and "gigabit capable" routers whereby if the NIC links automatically at 1gbps then the actual throughput is rubbish. Force it to 100 full and it works exactly as it should.

 

[mxnerd]

It's really weird. If it's a Realtek, download Realtek Diagnostics Program and run it. Haven't use it for years. There should be cable test function.

Realtek PCIe FE / GBE / 2.5G / Gaming Ethernet Family Controller Software - REALTEK

www.realtek.com

If it's Intel, you can also install Intel's PROSet utility, it comes with cable test function too.

 

[JackMDS]

If you look at mxnerd post #6 it indicate 1GB connection.

Tech J boast with 5G connection.

This speed sare not the real speed of the flow in the Network, they are the teoretical capacity of the Network card.

Your card indicate (post #9) 100Mb/sec. I.e., 10 times slower than MX and 50 time then Tech.

So. configure correctly the Network's cards (wire and wireless) on your computer and make sure that it say there at least 1GB.

Configure Gigabit Ethernet Network Adapter on Windows - MATLAB & Simulink

Configure your Ethernet adapter on Windows to ensure proper operation and optimum performance when acquiring images from a GigE Vision camera.

www.mathworks.com

In my systems I always uncheck the QoS and the IPv6. But that might depends specifically on some of your needs (if any).

 

[mxnerd]

@Tech Junky

I can get 10G in virtual environment.

==

Well, I don't really need super fast ethernet speed for home environment,

at least for the moment. All I do is configurations.

 

[Tech Junky]

@mxnerd Well, you could do 100GE in virtual if you wanted to.

 

[HutchinsonJC]

I saw something like this once with a UPS's supposed ethernet protection. I bypassed it and then suddenly the server had expected speeds. Both cables on both sides of the UPS's supposed protection were tested individually to be fine; I assumed it was the UPS itself.

 

[iamgenius]

Do you have any other device connected to your router by cable? If its speed is normal (you should get close to your internet speed but below 100 Mbps since your router is only 100Mbps), then it is your computer configuration that is the problem. I would wire a laptop to the router to check the speed. What is your internet speed anyways?

 

[Shmee]

Yeah what are the specs of the computer, and what is your ISP?