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Network speed drops on longer cable

Started by SteveArch , Sep 07 2023 04:37 AM

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11 replies to this topic

#1 SteveArch

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Posted 07 September 2023 - 04:37 AM

I've had 30Mbps broadband from Vodafone (UK), and it's been upgraded to 900Mb fibre. 
 
I ran in a hardwired cable directly to my hub, a distance of about 15m from my desktop PC, but I'm only getting ~60Mbps download and 120Mbps upload. Connecting my laptop, I'm getting the same speed.
 
Connecting to the network hub directly on a short network cable (1m) to my laptop, I'm getting full speed, ~600Mbps+. However, if I connect a long cable, ~10m, I'm only getting 40Mbps. The cable is rated Cat6. I've also tried three different cables now.
 
My PC is only a couple of years old, and the network adapter is rated for 1Gbps.
 
I'm at a loss as to what the problem might be. Any ideas??

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#2 Pkshadow

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Posted 07 September 2023 - 04:50 AM

Hi, Please download and run and do not skip the last step as fixes issues with network so need to reboot.

https://www.bleepingcomputer.com/download/adwcleaner/

 

Please Post a "link" of Speccy Report.
Please install Speccy Free : https://m.majorgeeks.com/files/details/speccy.html
Use Custom Install
  At the Top Left Corner of Speccy --> Click File and then Click Publish Snapshot Report, a window will popup and Click YES. --> Another popup will appear and then Click "Copy To Clipboard" then Paste that "link" to your next reply in your thread.

 

Download Minitoolbox from the below link :
http://www.bleepingcomputer.com/download/minitoolbox/

Select all as will reset network stuff and provide info to work with and see problems.

Now click "Go" and Copy/Paste and post the output text in your next reply


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www.cnn.com/2020/07/23/health/mosquitoes-attraction-humans-future-wellness-scn/index.html
 

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#3 cryptodan

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Posted 07 September 2023 - 05:15 AM

What kind of cable?

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#4 SteveArch

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Posted 07 September 2023 - 05:55 AM

http://speccy.piriform.com/results/h05KCg0ClXszO7GB2HO16Ay

 

ADW Cleaner didn't find anything


#5 SteveArch

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Posted 07 September 2023 - 05:56 AM

This is the cable:

https://www.amazon.co.uk/dp/B09TB3FLKD?ref=ppx_yo2ov_dt_b_product_details&th=1


#6 cryptodan

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Posted 07 September 2023 - 05:57 AM

This is the cable:
https://www.amazon.co.uk/dp/B09TB3FLKD?ref=ppx_yo2ov_dt_b_product_details&th=1


Did you crimp the ends yourself?

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#7 SteveArch

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Posted 07 September 2023 - 06:20 AM

Yes, but I've done loads of network installs, I know what I'm doing with cable ends. I've also checked them with a cable tester


#8 wee-eddie

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Posted 07 September 2023 - 06:38 AM

Have you got any loops in the cable?


#9 cryptodan

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Posted 07 September 2023 - 06:45 AM

Yes, but I've done loads of network installs, I know what I'm doing with cable ends. I've also checked them with a cable tester


I would redo the ends and double check your work. We are all human and we do make mistakes.

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#10 SteveArch

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Posted 07 September 2023 - 07:02 AM

OK, I dragged my desktop PC over to the router and got full speed out of it on a short cable. I then connected the long cable and I got full speed too. 

 

Poking around, I've realised that the speed drops when I connect to my work VPN. I have no idea why it was changing before, but it's definitely repeatable, switching off the VPN on the long cable gives me full speed

 

Sorry for the mistaken question!


#11 cryptodan

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Posted 07 September 2023 - 07:16 AM

That would make sense, your works VPN is being used for the speedtest.

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#12 greg18

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Posted 07 September 2023 - 12:26 PM

Bad cable can be ruled out, loops will not be a issue, drivers can be at fault, but also check the settings for the ethernet adapter for Large packet offload, etc. Change from auto to Full Duplex, power cycle the router and computer and use iperf3 between your desktop and another computer to test on the LAN, reset the network adapter properties with https://www.bleepingcomputer.com/download/farbar-service-scanner/


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