Connecting one computer to a network causes all other devices to lose connection.

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Snipe_Wizard

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Nov 26, 2013
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10,510
Recently I have been experiencing an issue where, when a specific computer is turned on, all devices on my network lose connection to the network. The computer causing this problem is a desktop running windows 8.1. There is also a windows 7 laptop, an Xbox one and 3 ipods on the network. All devices are connected wirelessly to a cisco DPC3825 DOCSIS 3.0 gateway router/modem.

[strike]This problem used to fix itself (devices would be disconnected but would reconnect and everything would work properly after a few minutes) but as of today, the desktop cannot connect anymore. If it does connect, it disconnects everything else then loses connection itself.[/strike]

I have tried assigning all devices static IP addresses, changing the desktop's IP to something higher in the list (in the 100s as opposed to the 10s), [strike]removing the static address from the desktop only[/strike], and resetting the modem but nothing has helped.

I appreciate any help with this issue as I am out of ideas.

Edit: making the desktop the only dynamic IP is what caused the problem described in the second paragraph. Assigning it a static IP fixes that particular problem but connecting the desktop still disconnects the other devices.
 
Solution
Onus
Are the Win8.1's wireless card's drivers up to date?
If no other IP address changed, then it may not be a conflict. Take the Win8.1 laptop to a hotspot somewhere, and see if it causes the same problems (warn anyone else using it first!). It may have a bad NIC that is splattering out all kinds of interference.
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Snipe_Wizard

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Nov 26, 2013
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10,510


Sorry for the improper description. The only networking device is the cisco DPC3825 DOCSIS residential gateway. I did not realize that a gateway was a type of device and the information I found called it both a router and a modem.
 
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Snipe_Wizard

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Nov 26, 2013
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It's just the 8.1 PC. It still happens when the are only 2 other devices connected but I can connect the other 5 at the same time with no problems.
 
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Snipe_Wizard

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Nov 26, 2013
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10,510


I'm not really sure how to check this, but both the windows 8.1 PC and the windows 7 laptop list the DHCP server as the router.
 
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Snipe_Wizard

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Nov 26, 2013
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The router is actually only single band and everything is using the 2.4 GHz band.
 
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Onus

Onus

Titan
Jan 27, 2006
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Record the IP addresses of everything you can, while they're all connected. Turn on the Win8.1 machine. When they drop, re-check their IP addresses.
I'd dig into the wireless settings on the Win8.1 machine; look at ALL of them for possible relevance.
 
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Snipe_Wizard

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Nov 26, 2013
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10,510


I did this and all the IP addresses were the same before and after turning on the 8.1 PC. As for the wireless settings, I don't know what to look for specifically but the status and properties of the wireless adapter seem alright.
 
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Onus

Onus

Titan
Jan 27, 2006
37,037
12
89,965
Are the Win8.1's wireless card's drivers up to date?
If no other IP address changed, then it may not be a conflict. Take the Win8.1 laptop to a hotspot somewhere, and see if it causes the same problems (warn anyone else using it first!). It may have a bad NIC that is splattering out all kinds of interference.
 
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Solution
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Snipe_Wizard

Honorable
Nov 26, 2013
11
0
10,510


[strike]The wireless adapter's drivers are up to date, I just updated them a few hours ago after the adapter stopped working (It works now but the problem is still occurring)[/strike]. The 8.1 machine is a desktop as I stated in my original post so I can't really take it anywhere. I will try using the adapter with the Win7 laptop and see if it causes the problem.

Edit: The drivers were not up to date. The ones I installed earlier were the wrong drivers, the adapter wasn't listed properly in the Network and Sharing Center so I ended up installing the drivers for something else. I have now installed the proper drivers and the problem is solved.
 
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