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Question Slow LAN on one of my computers ?

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tsomek

tsomek

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Aug 15, 2015
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Hi

I have 4 PCs running Windows 10 connected through a (cable) Gigabit Network Switch - one acting as a file server and the rest as clients.

Only one of the clients (The Threadripper one as per my signature) has considerably slower LAN speeds than all others, averaging around 20MB/s compared to 100MB/s of the others. I need to fix this.

The machine has 2x network adapters (one is 1Gb the other 2.5Gb, both on the motherboard), and this happens on both of them.

I have tried using various cables, and the same cables render the 100MB/s speeds on the other computers - so it's not the cable's fault.

I have tried resetting network settings, adapters etc (for instance following these instructions https://www.thewindowsclub.com/slow-ethernet-speed-on-windows), but the problem persists.

Can you please help me fix this?

Many thanks!
 
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by the way, just ran TamoSoft Throughput Test - please see output below
Screenshot-2023-01-13-120051.jpg
 
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helpstar said:
did you try a different port at the switch?


reinstall the lan drivers from the lan chip manufacturers (intel and realtek)
https://www.realtek.com/en/componen...0-1000m-gigabit-ethernet-pci-express-software
www.intel.de

Intel® Netzwerkadapter-Treiber für Windows® 10

Installiert die® Intel Netzwerkadapter-Treiberversion 29.4 für Windows® 10
www.intel.de www.intel.de

update the BIOS of your motherboard
Click to expand...

Ys, I did try different ports..

Ok, I'll update drivers and BIOS and will report back..

Many thanks 👍
 
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helpstar said:
did you restart windows yet? not shutting down, only restart flushes the cache of windows

any 3rd party firewall or antivirus installed?

try ubuntu live (no installation needed) or similar to check if it works better
Click to expand...

thanks for the input 👍

Yes, have restarted.

Glasswire installed - have tried killing the process - still the same

Avast antivirus installed, too. But the same goes for the other computers.

Happy to give live Ubuntu a try..

however again, all other computers have the exact same windows (and most software) version installed.. and seem to work fine..

I'm really baffled.

Also, I know for a fact that not too long ago I had the same speeds as all others.. can't verify when it changed though. Have had no major changes at all.. so weird..
 
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Try other connection paths that bypass the switch, wall jacks, etc.. serving the problem client system. Run a long, known working ethernet cable as a test if at all possible to directly connect slow computer to the router.

Swap connection paths with a known working (at speed) computer. Determine if the problem stays with the "slow" computer or stays with the slow computer's connection path.

Also: is there a reason that the slow computer has two network adapters?

In any case, ensure that only one of the two network adapters is enabled. Not both at the same time.
 
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Ralston18 said:
Try other connection paths that bypass the switch, wall jacks, etc.. serving the problem client system. Run a long, known working ethernet cable as a test if at all possible to directly connect slow computer to the router.

Swap connection paths with a known working (at speed) computer. Determine if the problem stays with the "slow" computer or stays with the slow computer's connection path.

Also: is there a reason that the slow computer has two network adapters?

In any case, ensure that only one of the two network adapters is enabled. Not both at the same time.
Click to expand...

Hi, thanks for the advice


To be honest, I've already done this, to ensure the problem is not with the cable, or the switch..

More specifically

1 ran a long, confirmed working cable directly from both 2x working computers and also to the problem computer to the same port on the switch => problem persists on the problem computer

2 the same as above on a different port of the switch => same result

3 the same as above directly to the router => same result

4 bought a USB Gigabit Ethernet port => same result

5 created a new user and logged out of my account => same result

Also, no idea why the motherboard has two ethernet ports - it's just built this way! (one is 1Gb the other 2.5Gb)


I'm starting to suspect it's a software thing holding me back..


Any further ideas anyone?

Only thing I haven't tried yet is the live Ubuntu..


Many thanks
 
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Make and model motherboard?

Run "ipconfig /all" (without quotes) via the Command Prompt and post the results.

You should be able to use copy and paste to do so. No need to retype the results.

Are both network adapters built into the motherboard? Or installed via PCIe?

Ensure that only one of the network adapters is enabled - not both at the same time. Any wireless network adapters should also be disabled.

Unless there is a known reason for using multiple network adapters only one network adapter should be enabled.
 
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Ralston18 said:
Make and model motherboard?

Run "ipconfig /all" (without quotes) via the Command Prompt and post the results.

You should be able to use copy and paste to do so. No need to retype the results.

Are both network adapters built into the motherboard? Or installed via PCIe?

Ensure that only one of the network adapters is enabled - not both at the same time. Any wireless network adapters should also be disabled.

Unless there is a known reason for using multiple network adapters only one network adapter should be enabled.
Click to expand...

Thanks for staying with me here..

1 Yes, both ethernet adapters are built into the motherboard - ASRock x399 Phantom - (see more specs of the problem computer (the Threadripper) from my signature)

2 Ok, making sure only the one adapter is enabled 👍

3 however, you will notice I use NordVPN and Virtualbox, and they both create virtual adapters - that hasn't changed in months, so it didn't impact the speeds before..

I've switched off NordVPN - slightly faster but still topping out at 40MB/s

PC-R-Nord-VPNoff.jpg


4 output of ipconfig below (I've blanked out some sensitive info)

Windows IP Configuration

Host Name . . . . . . . . . . . . : xxxxxxxxxxxxxxxxx
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : home

Ethernet adapter Ethernet 2:

Connection-specific DNS Suffix . : home
Description . . . . . . . . . . . : Intel(R) I211 Gigabit Network Connection
Physical Address. . . . . . . . . : xxxxxxxxxxxxxxxxx
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : xxxxxxxxxxxxxxxxx(Preferred)
Temporary IPv6 Address. . . . . . : xxxxxxxxxxxxxxxxx(Preferred)
Link-local IPv6 Address . . . . . : xxxxxxxxxxxxxxxxxPreferred)
IPv4 Address. . . . . . . . . . . : 192.168.2.60(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : 18 January 2023 12:47:18
Lease Expires . . . . . . . . . . : 19 January 2023 12:47:17
Default Gateway . . . . . . . . . : xxxxxxxxxxxxxxxxx
192.168.2.1
DHCP Server . . . . . . . . . . . : 192.168.2.1
DHCPv6 IAID . . . . . . . . . . . : 393250242
DHCPv6 Client DUID. . . . . . . . : xxxxxxxxxxxxxxxxx
DNS Servers . . . . . . . . . . . : xxxxxxxxxxxxxxxxx
8.8.8.8
1.1.1.1
xxxxxxxxxxxxxxxxx
NetBIOS over Tcpip. . . . . . . . : Enabled
Connection-specific DNS Suffix Search List :
home

Ethernet adapter NORDVPN:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : TAP-NordVPN Windows Adapter V9
Physical Address. . . . . . . . . : xxxxxxxxxxxxxxxxx
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter VirtualBox Host-Only Network:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : VirtualBox Host-Only Ethernet Adapter
Physical Address. . . . . . . . . : xxxxxxxxxxxxxxxxx
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : xxxxxxxxxxxxxxxxx(Preferred)
Autoconfiguration IPv4 Address. . : xxxxxxxxxxxxxxxxx(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : xxxxxxxxxxxxxxxxx
DHCPv6 Client DUID. . . . . . . . : xxxxxxxxxxxxxxxxx
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled

Wireless LAN adapter Local Area Connection* 8:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter
Physical Address. . . . . . . . . : xxxxxxxxxxxxxxxxx
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Local Area Connection* 10:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter #2
Physical Address. . . . . . . . . : xxxxxxxxxxxxxxxxx
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter WiFi:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : home
Description . . . . . . . . . . . : Realtek 8822BU Wireless LAN 802.11ac USB NIC
Physical Address. . . . . . . . . : xxxxxxxxxxxxxxxxx
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Bluetooth Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
Physical Address. . . . . . . . . : xxxxxxxxxxxxxxxxx
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
 
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On the problem computer try disabling IPv6.

Compare the above "ipconfig /all" to the "ipconfig /all" of the three computers that are not slow.

Is the network router/gateway really 192.168.2.1?

The slow computer is currently using 192.168.2.60 - is that expected?

Are the other three computers receiving a DHCP IP address of 192.168.2.X where X is within the allowed address range?

Make and model router? The router's logs (if available and enabled) may be capturing some relevant information.

Also look for some listing of connected devices. Determine if the slow computer is different in some way.
 
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I've now disabled IPv6 - up to 50MB/s now! 👍

Gateway/router is really 192.168.2.1 (wifi-router which is wired to my switch)

All computers have fixed IP's 192.168.2.10 - 20 - 30 etc

DHCP range is 150-250 - I've made sure not to manually apply IPs within the DHCP range

Router is BT Hub v6 - I'll check for logs, not sure yet if it has that option.

I'll also check its list of connected devices again..


I'll report back when I have that info.

In the meantime, please let me know of any other ideas/suggestions that might come to mind!

Many thanks!
 
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Hi again

I haven't progressed far for this, unfortunately.

The ubuntu live USB didn't render any results as I couldn't get access to the windows shares.. I still don't quite understand why.

In addition, my Bluetooth connection has started getting 2-3 second timeouts...

so at the moment I'm concerned if this could be related to a failing motherboard perhaps? Is there any way of testing / confirming this?

Many thanks..
 
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