computers connect 2 ethernet networks at same time

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Sara100

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Mar 6, 2014
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HI ALL

i have 4 computers were fine two weeks ago but now they are connecting to two networks through one Ethernet cable at the same time with no intent access , I have only one network I tried disable the network card and enable it works with one computer but other computers didn't work , I tried connect the computer to main modem it works fine but if I plug in back to socket it connects to two networks again
any ideas why or any solutions
thank you
 
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hang-the-9

hang-the-9

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Mar 25, 2010
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How do you know they are connecting to a second network? That's impossible unless the switch is wired up to both those networks, and even then unless you have two network cards, only one will be detected.

Do an IPCONFIG /ALL command at a DOS prompt, what IPs do you get? What adapters are showing for those IPs?

Did you maybe install some sort of VPN program that created a virtual network adapter?

How is your network setup?
 
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Sara100

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Mar 6, 2014
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the first network name is Network 2 which is connected fine with an IP and gateway of my main network
but the computers also trying at same time to connect the second unidentified network .
I didn't install any VPN because its a school's network
 
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hang-the-9

hang-the-9

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Mar 25, 2010
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You need to give more details. Run the ipconfig command on all of them. Is it Network 2 or "Network Connection 2" or "Wireless Network Connection 2"?

And how are they trying to connect to this second? They can't if they only have one connection. Do they have multiple network cards? On Wireless?

As I said in the first post, need full network details. Start at the modem and go back to the computers, what is hooked up to what?
 
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Sara100

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Mar 6, 2014
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I have only one network card on Computers don't have wirless network. Computers trying to connect at the same time two ethernet networks . Both networks are local area networks . I have router and switch with no server .it's school network so try to bring all details by Monday
 
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hang-the-9

hang-the-9

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Mar 25, 2010
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Back into what socket?

They can't be connecting to two networks it's physically impossible. Like saying your car is trying to drive on two different roads. If the cable is directly connected to the jack, it can't be connecting to anything else. You are not interpreting what you are seeing properly. Did you do the ipconfig /all command? Post the results.

Also post the exact network setup you have, you talk about a socket, where is that socket? Are you talking about a wall jack? Where does that wall jack go to? If it's a school network did you contact the IT support for the school? If you have a router, what is the router connecting to?

Keep in mind that if you are in a dorm, the network jack is likely to only give an IP to a single device by default. Your best bet is to work with the school IT people.
 
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Sara100

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Mar 6, 2014
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"
Back into what socket?"
Click to expand...
back to network socket/ jack wall . that used to work fine a day before the issue.




If the cable is directly connected to the jack, it can't be connecting to anything else. You are not interpreting what you are seeing properly. Did you do the ipconfig /all command? Post the results
Click to expand...
.
i will try to post them by Monday because its weekend in my contrary

believe me the computers are trying to connect to two networks at the same time even the network admin said the same thing ....

Also post the exact network setup you have, you talk about a socket, where is that socket? Are you talking about a wall jack? Where does that wall jack go to? If it's a school network did you contact the IT support for the school? If you have a router, what is the router connecting to?
Click to expand...
network socket on the wall and it goes to the switch ,
and switch is connected to router/Modem connect to telephone line and switch , also to one computer

Keep in mind that if you are in a dorm, the network jack is likely to only give an IP to a single device by default. Your best bet is to work with the school IT people.
Click to expand...

sorry but English is not my first language i have some problems to explain everything in perfect language
i am working with the network admin ,
 
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Alec Mowat

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Jan 8, 2014
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Open CMD

Type "ipconfig /all"

Post results.



Do you have anything installed related to virtualization, specifically Hyper V for Windows 8, or Virtual Box?


What router are you using, and how many computers are on them?

If I had to guess, there's two DHCP servers or you have two NIC drivers installed.
Check the Computer Device Manager, and review the Network Cards. Confirm only the NIC you are using is installed.

Once you post IPconfig, that should give us an idea of what network card is actually being used.
 
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Sara100

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Mar 6, 2014
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I am sorry for been late with replay because of work, this problem has spread in different computers in schools in my city. The ip of both networks is the same when I run ipconfig /all I got the information of the main network and the other network has the same ip and looks like its invisible. And every time I clicked on properties of the connection I only get the same information for both connections.

One of the network is named Microsoft virtual network, if I connected computers wirelessly it shows two adapters one is named Microsoft virtual network and other one is the main network of the school. If I disabled the virtual one, the connection dispersed from manage network adapters,
so the network admin deleted Kaspersky endpoint in some computers the network dispread, the problem has gone .
But not all computers have the Kaspersky endpoint. What I notice is all computers which have the issue the antivirus program is detected malware , however not all antivirus is detected malware.

So My question is can a malware causing this problem and how I can solved ?

also I if I connected computers through Ethernet cable I only got one adapter with two connection one is unidentified network and the other is name of school's network.

What are the names of the two networks?
Click to expand...

wireless :
Microsoft virtual and the moe.local (the name of the school's network )
cable :
unidentified network and moe.local


and I only have workgroups without severs
Sorry for late replay
Thank you for your help



 
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hang-the-9

hang-the-9

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Mar 25, 2010
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The Virtual MS network adapter is not a network card physically. You will see these virtual adapters with remote access software, VPN software, things like that. There was almost certainly just one network card. Very few computers would have two cards installed. The main issue is that the school IS support is not very experienced. Even with several network adapters installed the computers should be connecting fine. It's just tough to troubleshoot things from a forum posting when you can't actually see what is happening and how things are plugged in.
 
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Alec Mowat

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Jan 8, 2014
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If he posted the IP config, we could see where the issue was
 
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