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Description:  

Local Link Multicast Name Resolution (LLMNR) is a secondary name resolution protocol. Queries are sent over
the Local Link, a single subnet, from a client machine using Multicast to which another client on the same link,
which also has LLMNR enabled, can respond. LLMNR provides name resolution in scenarios in which
conventional DNS name resolution is not possible.

If you enable this policy setting, Multicast name resolution or LLMNR, will be turned off for the machine across
all available but un-configured network adapters.

If you disable this policy setting, Multicast name resolution or LLMNR, will be turned on for the machine across
all available but un-configured network adapters.

If you do not configure this policy setting, Multicast name resolution or LLMNR, will be turned on for the
machine across all available but un-configured network adapters by default.

Supported on: At least Windows Vista.
Turn off Multicast Name Resolution
Description Gpedit Regedit CMD Back VBScript PowerShell Script
Gpedit:   

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Type gpedit.msc and press Enter
In the Group Policy window please navigate to Computer Configuration -> Administrative Templates ->
Network -> DNS Client and open Turn off Multicast Name Resolution.
Not Configured -> is the Default state
Enabled -> apply this GPO
Disabled -> this GPO will not be applied

To finish press ok button and close Group Policy window.
Description Gpedit Regedit CMD Up Back VBScript
Type regedit and press ok
Please confirm User Account Control pop-up
Microsoft official disclaimer

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by
using another method. These problems might require that you reinstall the operating system. Microsoft
cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Note: This registry key is created by Group Policy when this GPO is Enable or Disable. The GPO Default state
is Not Configured -> this registry entry is not present.

Please navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient and
locate
EnableMulticast registry key
Regedit:          

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Description Gpedit Regedit CMD Up Back VBScript
Double click on EnableMulticast and edit the value:

To Enable:
Change the data value with 0

To Disable:
Change the data value with 1

To finish press ok button and close Registry Editor window

Note: Manual editing of this registry key will not be reflected in Group Policy. If you modify this GPO from
Group Policy this registry key will be rewritten.
Description Gpedit Regedit Back CMD VBScript Up
Type cmd, right click on cmd icon under the Programs and click on Run as administrator
Please confirm User Account Control pop-up
Please select, right and copy a registry key from below, then right click on command prompt window
, select Paste and press Enter

Enabled:
REG add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient" /v EnableMulticast /t REG_DWORD /d 0 /f

Disabled:
REG add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient" /v EnableMulticast /t REG_DWORD /d 1 /f

Not Configured:
REG DELETE "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient" /v EnableMulticast /f

Note: Manual editing of this registry key will not be reflected in Group Policy. If you modify this GPO from
Group Policy this registry key will be rewritten.
CMD:          

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Description Gpedit Regedit Back CMD VBScript Up
VBScript:          

Const HKEY_LOCAL_MACHINE = &H80000002
strComputer = "."
Set oReg=GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & _
strComputer & "\root\default:StdRegProv")

strKeyPath = "SOFTWARE\Policies\Microsoft\Windows NT\DNSClient"
oReg.CreateKey HKEY_LOCAL_MACHINE,strKeyPath
strValueName = "EnableMulticast"
'Enabled
dwValue = 0
'Disabled
'dwValue = 1
oReg.SetDWORDValue HKEY_LOCAL_MACHINE,strKeyPath,strValueName,dwValue
'Not Configured
'oReg.DeleteValue HKEY_LOCAL_MACHINE,strKeyPath,strValueName
Description Gpedit Regedit Back CMD VBScript Up
PowerShell Script :          

Enabled\Disabled

$RegKey = "HKLM:\SOFTWARE\Policies\Microsoft"
If(Test-Path ($RegKey + "\Windows NT"))
{
 $RegKey = "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT"
 If(Test-Path ($RegKey + "\DNSClient"))
 {
   $RegKey = "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient"
   ##Enabled
   New-ItemProperty -path $RegKey -name EnableMulticast -value 0 -PropertyType DWord -Force
   ##Disabled
   ##New-ItemProperty -path $RegKey -name EnableMulticast -value 1 -PropertyType DWord -Force
 }
 else
 {
   New-Item -path $RegKey -name DNSClient
   $RegKey = "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient"
   ##Enabled
   New-ItemProperty -path $RegKey -name EnableMulticast -value 0 -PropertyType DWord
   ##Disabled
   ##New-ItemProperty -path $RegKey -name EnableMulticast -value 1 -PropertyType DWord
 }
}
else
{
 New-Item -path $RegKey -name Windows NT
 $RegKey = "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT"
 New-Item -path $RegKey -name DNSClient
 $RegKey = "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient"
 ##Enabled
 New-ItemProperty -path $RegKey -name EnableMulticast -value 0 -PropertyType DWord
 ##Disabled
 ##New-ItemProperty -path $RegKey -name EnableMulticast -value 1 -PropertyType DWord
}

Not Configured

$RegKey = "HKLM:\SOFTWARE\Policies\Microsoft"
Remove-ItemProperty -Path($RegKey + "\Windows NT\DNSClient") -name EnableMulticast
If( (Get-Item -Path($RegKey + "\Windows NT\DNSClient")).ValueCount -eq 0 -and (Get-Item -Path($RegKey + "\Windows NT\DNSClient")).SubKeyCount -eq 0)
{
 Remove-Item -Path($RegKey + "\Windows NT\DNSClient")
 If( (Get-Item -Path($RegKey + "\Windows NT")).ValueCount -eq 0 -and (Get-Item -Path($RegKey + "\Windows NT")).SubKeyCount -eq 0)
 {
   Remove-Item -Path($RegKey + "\Windows NT")
 }
}
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