How to disconnect internet connection of my system

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I need to disconnect internet connection of my single system, connected in LAN, and I need to connect again to the internet.

How could I make this happen?

I used...
ReleaseDHCPLease and RenewDHCPLease

But it didn't work

Help me!!

Posted 16-May-11 1:28am

samueal123

Updated 18-May-11 21:38pm

Dalek Dave

v3

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Comments

samueal123 17-May-11 0:30am

Internet connection can be disconnected by unplugging the network cable.

How could i do this through c# program.

And again i need to connect to the internet connection after a while.

My system is connected with LAN, i should disconnect only my system from the internet.

Can anyone help me pls??

Dalek Dave 19-May-11 3:39am

Edited for Grammar and Readability.

5 solutions

Solution 2

You can use InternetHangUp method of wininet.dll.

http://pinvoke.net/default.aspx/wininet/InternetHangUp.html[^]

Posted 16-May-11 1:49am

J a a n s

Comments

Kim Togo 16-May-11 7:53am

"Instructs the modem to disconnect from the Internet." - Okay then...

yesotaso 16-May-11 11:07am

:)Axe on the cable - sledge on the modem - right click "the" icon and disable, all works aswell. Though 1st 2nd options may be problematic on re-connect

samueal123 17-May-11 0:35am

@jaans: i don't need the modem to get disconnected. My system is connected in LAN and i need to disconnect only my system.

Solution 3

This might help, but I haven't tested it:

http://www.eggheadcafe.com/community/aspnet/2/10068229/how-to-disconnect-the-internet-connection-using-c.aspx[^]

Google reveals all:

Search results for "C# disconnect machine from internet"
[^]

Posted 16-May-11 1:51am

#realJSOP

Solution 4

You can change "default gateway" on the computer to the computers own IP address or 0.0.0.0

Posted 16-May-11 1:54am

Kim Togo

Comments

yesotaso 16-May-11 11:12am

strComputer = "."
Set objWMIService = GetObject( _
"winmgmts:\\" & strComputer & "\root\cimv2")
Set colNetCards = objWMIService.ExecQuery _
("Select * From Win32_NetworkAdapterConfiguration " _
& "Where IPEnabled = True")
For Each objNetCard in colNetCards
objNetCard.ReleaseDHCPLease()
Next
From "http://msdn.microsoft.com/en-us/library/aa394595%28v=VS.85%29.aspx"

samueal123 17-May-11 0:31am

I tried with ReleaseDHCPLease() but it didn't help me.

Kim Togo 17-May-11 2:26am

Are the computer running with DHCP enabled?
If not, then the ReleaseDHCPLease() will not work. Again, changing default route is one way and you do not loss IP connection on local IP network.

samueal123 17-May-11 2:50am

@Kim togo: How could i find whether my computer is running with DHCP enabled??

Kim Togo 17-May-11 2:53am

http://doit.vuse.vanderbilt.edu/SEDCON/networks/DHCP/

Is some image on how to check.

samueal123 17-May-11 2:58am

Sry I don't don't have administrative privileges to check?

Kim Togo 17-May-11 3:00am

Then I do not think you can do what you want. Changing IP settings on a computer requires administrative privilege.

samueal123 17-May-11 3:14am

Actually What i need to do is to Disconnect Internet connection of single system temporarily.. Since i have connected three systems through LAN,I guess that disconnecting the LAN connection will disconnect internet connection of that particular system!!!

Am I clear?

To tell in simple words, unplugging the LAN Wire manually will disconnect internet. I need to do this through program!!!

Kim Togo 17-May-11 3:25am

But you cannot, my guess is that ReleaseDHCPLease requires administrative privilege. Try check return result of ReleaseDHCPLease.
http://msdn.microsoft.com/en-us/library/aa393047(v=vs.85).aspx

samueal123 17-May-11 3:34am

@Kim Togo: In c# we have a method

Process.Start("disconnect.exe", username, password, Domain);

Using this we can disconnect!! I need the code for disconnecting

Kim Togo 17-May-11 4:19am

I do not know what "disconnect.exe" is. But I can see that you supply a username and password to get administrative privilege ?
Then try this with ReleaseDHCPLease.

samueal123 17-May-11 7:27am

Sry Kim Togo I am not running my machine in DHCP. IP has been assigned.

Kim Togo 17-May-11 7:51am

Try to figure out what "disconnect.exe" do. Run the program and see if the program has disabled the network card or only IP.

samueal123 17-May-11 8:52am

Disconnect.exe is nothing but, i created a console application that releases all DHCP..

Kim Togo 17-May-11 8:15am

Look at http://msdn.microsoft.com/en-us/library/Aa394595 link and see under "...disable or enable a NIC?"

samueal123 17-May-11 8:57am

yes Kim, but you take look at Win32_NetworkAdapter class in detail it doesn't have methods Enable or Disable!!

Kim Togo 17-May-11 8:58am

Sorry, from Windows Vista / 7 you can.
Disable - http://msdn.microsoft.com/en-us/library/aa390364
Enable - http://msdn.microsoft.com/en-us/library/aa390385

samueal123 17-May-11 9:07am

mine is windows XP.. Any idea?

Kim Togo 17-May-11 9:36am

Sorry no.

samueal123 18-May-11 3:26am

Thanks for your effort Kim, take a look at this

Solution 1

There is no easy way. Blocking port 80 could be a simple workaround.
Disabling the network adapter is easier. But I guess you don't want that.

Posted 16-May-11 1:35am

Abhinav S

v2

Comments

samueal123 17-May-11 2:38am

Can you please tell me how could i do that?

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samueal123 · Accepted Answer · 2011-05-18T21:08:00

<pre lang="vb">Public Shared Sub ToggleWirelessConnection()
        For Each verb As Shell32.FolderItemVerb In WirelessConnectionFolderItem.Verbs
            If verb.Name = "En&able" OrElse verb.Name = "Disa&ble" Then
                verb.DoIt()
                Exit For
            End If
        Next
        Threading.Thread.Sleep(1000)
    End Sub

This is my code in VB. And at last i found it

How to disconnect internet connection of my system

5 solutions

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Solution 1

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