Lan issues connecting 2nd PC to router

Drifter

Drifter

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Hi clever guys, need help/advice please. As of last week, as soon as I connect a 2nd PC to my router via cable, everything dies. If I unplug the 2nd PC and do a speedtest, my ping is around 23ms and download around 9 Mbps. This is on 10Mbps ADSL. When I connect the 2nd PC, ping jumps to 1300ms and download drops to 2/3Mbps. Nothing running on 2nd PC. I tried a different cable, same result.

Any suggestions?

Router is a TP-Link Archer D7.
 
Your second PC is using the network

Open task manager and see which program is sucking all the Internet juice
 
Drifter said:
Just checked, shows 0% Network usage.
Click to expand...
Does the router's Web page tell you current throughput? If the second machine is infected with something it might try hide itself from the OS, but the router will recognise the traffic
 
You're having the issue where there's 2x dhcp servers conflicting using the IP layover on T2LP where it should be LAN2

Best bet is to turn it off and on again.
 
Tried switching off and on, rebooting the devices, no joy. Tried switching ports. As soon as I plug the 2nd LAN cable in, boom, speed gone.
 
Windows 10 on the second PC? Press windows key & R type winver - which version of 10 is it? If its very old could be forcing updates, killing your connection speed. Download 1909 iso on pc1, copy iso to pc2 and run setup, choose keep files and apps.

Run malwarebytes scan on pc2 if its not windows.
 
Last edited:
I ran a diagnostic on the router , it fails NSCI with the 2nd cable plugged in, but pass with it unplugged. I'm starting to suspect the network card in the 2nd pc.
 
When last was the PC connected to a network via the LAN? Tried to connect only this PC with the other disconnected?
Maybe you should start with a reset of all IP configurations on that PC?
 
Deja Vu


Try this, on both PC's

Open internet exporer, goto tools/settings -> Advanced-> Reset internet explorer settings.
 
If you disable the NIC rather than unplugging it does the latency get better. When restarting the PC at what stage does the latency increase.
If its bad when NIC is disabled or booting into OS before all the services kick in then its most likely a duff NIC.

If it only gets bad once PC has started up, logged in etc, then it could be auto updating. But at that kind of latency it sounds like a bad NIC
 
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