Turn off Multicast Bootstrap
Verified with Windows 11 25H2 — updated on July 10, 2026
Supported on: At least Windows XP Professional with SP2
Path in the GPO console
Computer Configuration\Administrative Templates\Network\Microsoft Peer-to-Peer Networking Services\Peer Name Resolution Protocol\Link-Local Clouds Description
This setting disables PNRP protocol from advertising the computer or from searching other computers on the local subnet in the link local cloud. The Peer Name Resolution Protocol (PNRP) allows for distributed resolution of a name to an IPV6 address and port number. One of the ways in which PNRP bootstraps itself is by using multicast on the same subnet. That is, PNRP publishes itself on the local subnet, so that other computers can find it when needed. If you enable this setting, PNRP will not use multicast for bootstrapping. Specifying this registry key will break scenarios where there is no seed server for bootstrap (such as ad hoc networking scenarios). If you disable this setting, PNRP will use multicast for bootstrapping on the same subnet. If this setting is not configured, the protocol will revert to using a public registry key to determine whether it will publish the computer or will use multicast to search for other computers on the local subnet. The multicast protocol used for bootstrapping is SSDP (Simple Service Discovery Protocol). The SSDP service must enabled (which it is by default) for this policy to have effect.
Registry
Software\policies\Microsoft\Peernet\Pnrp\IPv6-LinkLocal Value name: DisableMulticastBootstrap
Enabled: DisableMulticastBootstrap = 1
Disabled: DisableMulticastBootstrap = 0
Export Builder
BETAConfigure the state, scope and options, then generate .reg, PowerShell, Intune and SCCM outputs — or add the setting to a multi-setting collection.
These exports write the registry — this is not a managed GPO. ⓘ
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Turn off Multicast Bootstrap
; State: Enabled
; Supported on: At least Windows XP Professional with SP2
[HKEY_LOCAL_MACHINE\Software\policies\Microsoft\Peernet\Pnrp\IPv6-LinkLocal]
"DisableMulticastBootstrap"=dword:00000001More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Turn off Multicast Bootstrap
# State: Enabled
# Supported on: At least Windows XP Professional with SP2
$path = 'HKLM:\Software\policies\Microsoft\Peernet\Pnrp\IPv6-LinkLocal'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'DisableMulticastBootstrap' -Value 1 -Type DWordIntune XML
No direct Policy CSP / OMA-URI mapping for this policy. Use the Intune Remediation tab, or ingest the ADMX in Intune.Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Turn off Multicast Bootstrap
# State: Enabled
# Supported on: At least Windows XP Professional with SP2
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\policies\Microsoft\Peernet\Pnrp\IPv6-LinkLocal' -Name 'DisableMulticastBootstrap' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Turn off Multicast Bootstrap
# State: Enabled
# Supported on: At least Windows XP Professional with SP2
$path = 'HKLM:\Software\policies\Microsoft\Peernet\Pnrp\IPv6-LinkLocal'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'DisableMulticastBootstrap' -Value 1 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Turn off Multicast Bootstrap
# State: Enabled
# Supported on: At least Windows XP Professional with SP2
# SCCM Configuration Item guidance:
# Create a Configuration Item of type "Setting: Script".
# Discovery script: use the Detection script below.
# Remediation script: use the Remediation script below.
# Compliance rule: the Discovery script output equals 'Compliant'.
# === Detection script ===
# Exported from gporais.com
# Policy: Turn off Multicast Bootstrap
# State: Enabled
# Supported on: At least Windows XP Professional with SP2
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\policies\Microsoft\Peernet\Pnrp\IPv6-LinkLocal' -Name 'DisableMulticastBootstrap' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Turn off Multicast Bootstrap
# State: Enabled
# Supported on: At least Windows XP Professional with SP2
$path = 'HKLM:\Software\policies\Microsoft\Peernet\Pnrp\IPv6-LinkLocal'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'DisableMulticastBootstrap' -Value 1 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.