Laptop interferes with WiFi

Type ipconfig on her laptop and yours and then paste the full results of both here.

Also

Altering bands on router. (Not been though all but a few and no difference

You mean channels and best leave it set to auto.

Turning down transmission power on laptop

Err transmission power???

And, does the same thing happen if you unplug the extender?

You mean channels and best leave it set to auto.

Will do.

Err transmission power

On the WiFi card it's an option under advanced.

Will do up config when online. Ip addresses are not conflicting but didn't check rest. All wifi is down When hers is connected btw not just two laptops.

And, does the same thing happen if you unplug the extender?

Have not tried that but I have tried contacting her laptop to the WiFi extender (it's a separate SSID) instead of the main router and the results are the same.

Also I've also tried clearing arp table out of shear desperation

If you post up the ipconfig results it might give some pointers for starters..

Suggest the extender is configured with the same SSID and pw as whatever the router is set to. That way your devices will roam between the two albeit not particularly refined. What sort of extender anyway? I think you should rule that out first by disconnecting it/removing it from the network. 

My lap top
partners latop I can't post from as it kills the network. IP address is just different, currently I tried reserving .69 on the router for it

Wireless LAN adapter Wi-Fi:

Connection-specific DNS Suffix . : lan
Link-local IPv6 Address . . . . . : fe80::24c7:9b6b:89ab:54ee%16
IPv4 Address. . . . . . . . . . . : 192.168.1.151
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1

dam forum doesn't do mark down parsing. Thought htat would be standard

Suggest the extender is configured with the same SSID and pw as whatever the router is set to

Its not designed to be same SSID, that causes problems, its designed to be a different SSID

I think you should rule that out first by disconnecting it/removing it from the network.

I will do when I get a chance but all have been working fine up until sunday.

How have you reserved that IP address on your laptop - on the router is OK but if youve typed it in the WiFi settings on your laptop then change it back to DHCP.

What if you disable the Wifi adapter in your partner's laptop and use a cable?

Do you know the IP address of your partner's laptop and also the ip address of your extender? What is the gateway IP address on the extender configured as?

Definitely turn off the extender and test to try and pinpoint the issue.

What changed at the weekend when it started misbehaving - any software installed on partner's laptop, any new devices added, network equipment restarted etc?

Post up the results of an ipconfig /all too

Its not designed to be same SSID, that causes problems, its designed to be a different SSID

OK so it's not really a range extender then, it's just a different wireless network and the fact that "it causes problems" might be a clue here, does partner's laptop kill the network when connected to either SSID? Definitely turn off the extender and try... Also try turning off the 5Ghz on both the extender and the router.
Basically you are going to have to try all this stuff one thing at a time and then test to work out if any thing resolves it. Very hard to troubleshoot by forum!

Oh and is your extender setup to be a DHCP server, as if it is that will bring a whole world of pain... What type of extender is it?

Was it your partner's laptop that had the 192.168.1.254 address? It's quite possible that the gateway on the extender is configured to be 192.168.1.254 rather than 192.168.1.1 which is what it is set at on your network (they tend to be either .1 or .254 on most home networks). If your partner's laptop was being sent all the gateway traffic that would kill stuff!

If it suddenly went off without anything else changing that you can think of then it is quite likely a DHCP/IP lease type issue and I'd be looking at the extender..

How have you reserved that IP address on your laptop – on the router is OK but if youve typed it in the WiFi settings on your laptop then change it back to DHCP.

Router

What if you disable the Wifi adapter in your partner’s laptop and use a cable

Everything is fine.

Do you know the IP address of your partner’s laptop and also the ip address of your extender? What is the gateway IP address on the extender configured as?

Switched off ATM, still issues. Can't remember from top of my head

Definitely turn off the extender and test to try and pinpoint the issue.

Yep it's off now.

What changed at the weekend when it started misbehaving – any software installed on partner’s laptop, any new devices added, network equipment restarted etc?

Nothing. Obviously might have been a windows update but I wouldn't know.

OK with the extender still off can you turn of the 5Ghz radio on the router? If you are able to maybe try that and test again..

OK so it’s not really a range extender then, it’s just a different wireless network and the fact that “it causes problems” might be a clue

It would cause problems if it had the same ssid, not that it does or has cause problems. I forget the network term but it is its own SSID but connects to the original WiFi for its own access, like a access point but it's connection is also.

Also try turning off the 5Ghz on both the extender and the router.
Basically you are going to have to try all this stuff one thing at a time and then test to work out if any thing resolves it. Very hard to troubleshoot by forum!

Now that's a good idea. Yep I've done enough remote debugging to know that it's difficult.

Oh and is your extender setup to be a DHCP server, as if it is that will bring a whole world of pain… What type of extender is it?

How come? They are separate networks, you only connect to one at a time. We do it manually depending on what the best signal is. House normal WiFi garden we use the access point.

Was it your partner’s laptop that had the 192.168.1.254 address?

Yep

It’s quite possible that the gateway on the extender is configured to be 192.168.1.254 rather than 192.168.1.1 which is what it is set at on your network (they tend to be either .1 or .254 on most home networks). If your partner’s laptop was being sent all the gateway traffic that would kill stuff!

Good point I will check. That was why I changes her up (well reserved her .69 on the router) as I know 1. And .254 frequently gets used for equipment.

If it suddenly went off without anything else changing that you can think of then it is quite likely a DHCP/IP lease type issue and I’d be looking at the extender..

Good idea again. I will have a look at it's settings. I have turned it (the extender / access point) off for now and network is still slow but we do have a slow connection need to have reset everything on the home router that I alter to base line it.

Thanks you have given me some ideas.

OK with the extender still off can you turn of the 5Ghz radio on the router? If you are able to maybe try that and test again..

Sorry slow reply just answering second post. Just resetting everything on home router.

I spoke too soon I thought speed had improved but it is as if slows down slowly. On first start up it's ok then speed deteriorating.

WiFi is a red herring. I thought it was ok plugged into LAN (WiFi switched off) it's not.it is ok for one or two requests but then kills the network again!

This has take 30 min but ipconfig from partners laptop. 1st connected via wifi second via LAN

Wireless LAN adapter WiFi:

Connection-specific DNS Suffix . : lan
Description . . . . . . . . . . . : Realtek RTL8822CE 802.11ac PCIe Adapter
Physical Address. . . . . . . . . : 50-5A-65-FC-9B-EB
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::5f9b:44ea:c671:bc9a%11(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.69(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : 19 October 2023 21:27:41
Lease Expires . . . . . . . . . . : 21 October 2023 20:06:35
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 122706533
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-2B-9F-C9-7A-7C-4D-8F-B5-B3-E8
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Via LAN

Via wired

Ethernet adapter Ethernet:

Connection-specific DNS Suffix . : lan
Description . . . . . . . . . . . : Realtek PCIe GbE Family Controller
Physical Address. . . . . . . . . : 7C-4D-8F-B5-B3-E8
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::1b40:3ebb:2f73:bebf%6(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.253(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : 20 October 2023 20:39:07
Lease Expires . . . . . . . . . . : 21 October 2023 20:44:06
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 125586831
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-2B-9F-C9-7A-7C-4D-8F-B5-B3-E8
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Similar issue here, partner bought brand new windows 11 machine a while back. Mine is w10

When she connected to the wifi it gradually slowed down and stopped altogether for both of us. Never got to the bottom of it. She was persistent but in the end gave up, returned the laptop and bought a w10 version. Problem gone

Has she got a torrent client running, or picked up something unpleasant? What's "network" look like under the Performance tab in Task Manager?

Does it do it on another network entirely? Will it DoS, say, Starbucks?

At two months old I'd be tempted just to factory reset it. If that doesn't fix it I'd suggest sending it back for repair / replacement.

Nothing wrong with any of those ipconfig results.

It’s most odd for sure.

If it’s only about 8 weeks old I’d be tempted to rebuild it. It’s not looking like it’s network or hardware related or even driver related as it does it wired and wireless.

You could try resetting the network stack.

Run the below command from a command prompt as administrator

netsh int ip reset

up something unpleasant? What’s “network” look like under the Performance tab in Task Manager?

Does it do it on another network entirely? Will it DoS, say, Starbucks?

At two months old I’d be tempted just to factory reset it. If that doesn’t fix it I’d suggest sending it back for repair / replacement

Nothing like a torrent client. I have not tried another network will take a try.

Nothing wrong with any of those ipconfig results.

It’s most odd for sure.

If it’s only about 8 weeks old I’d be tempted to rebuild it. It’s not looking like it’s network or hardware related or even driver related as it does it wired and wireless.

You could try resetting the network stack.

Run the below command from a command prompt as administrator

netsh int ip reset

Just doing the netsh CMD.

Been poking around with netstat and nothing suspicious running around on the traffic.

Hmmph. Will try factory reset. One for another exciting night. Thanks for all the help guys. I am obviously not a network guy so other people are of a great help

Sorry if this has already been asked, answered or tested for, but is the offending device killing the WiFi, the whole network or the internet connection?

As far as I understood it the device was killing the whole network wired and wireless.

Let me elaborate. If the wifi is turned off on the laptop and then it's plugged into the router with a patch cable, does it still kill the whole LAN.
Also, how does the OP know that it is just the LAN that goes down and not the Internet connection? Just trying to deduce whether it's faulty hardware, in which case if it is then no amount of resetting this, that or the other will help.

WiFi was off when try lan connection.

But anyway I think we have a solution.

After a reset (windows restore) everything was fine for a few days, then issues again. Some more fiddling and it *seems* that the settings that fixed it was disabling "large send offload packet". This is under device manager> network> network card (not WiFi adapter). For now this seems to solved the issue.

What is odd is that apparently any new network card should support this. No idea but seems to be a common ish windows 11 issue.

P.s. I was looking at TCP view and nothing stood out. I was just about to take peak with wireshark and look for suspicious activity but this setting seemed to solve the issue. :/ not sure I understand the fix and I don't like fixes I don't understand