---
title: MSSLegacy Policy CSP
description: Learn more about the MSSLegacy Area in Policy CSP.
author: vinaypamnani-msft
manager: aaroncz
ms.author: vinpa
ms.date: 01/09/2023
ms.localizationpriority: medium
ms.prod: windows-client
ms.technology: itpro-manage
ms.topic: reference
---

<!-- Auto-Generated CSP Document -->

<!-- MSSLegacy-Begin -->
# Policy CSP - MSSLegacy

> [!TIP]
> This CSP contains ADMX-backed policies which require a special SyncML format to enable or disable. You must specify the data type in the SyncML as &lt;Format&gt;chr&lt;/Format&gt;. For details, see [Understanding ADMX-backed policies](./understanding-admx-backed-policies.md).
>
> The payload of the SyncML must be XML-encoded; for this XML encoding, there are a variety of online encoders that you can use. To avoid encoding the payload, you can use CDATA if your MDM supports it.  For more information, see [CDATA Sections](http://www.w3.org/TR/REC-xml/#sec-cdata-sect).

<!-- MSSLegacy-Editable-Begin -->
<!-- Add any additional information about this policy here. Anything outside this section will get overwritten. -->
<!-- MSSLegacy-Editable-End -->

<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-Begin -->
## AllowICMPRedirectsToOverrideOSPFGeneratedRoutes

<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-Applicability-Begin -->
| Scope | Editions | Applicable OS |
|:--|:--|:--|
| :heavy_check_mark: Device <br> :x: User | :x: Home <br> :heavy_check_mark: Pro <br> :heavy_check_mark: Enterprise <br> :heavy_check_mark: Education <br> :heavy_check_mark: Windows SE | :heavy_check_mark: Windows 10, version 1803 [10.0.17134] and later |
<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-Applicability-End -->

<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-OmaUri-Begin -->
```Device
./Device/Vendor/MSFT/Policy/Config/MSSLegacy/AllowICMPRedirectsToOverrideOSPFGeneratedRoutes
```
<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-OmaUri-End -->

<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-Description-Begin -->
<!-- Description-Source-Not-Found -->
<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-Description-End -->

<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-Editable-Begin -->
<!-- Add any additional information about this policy here. Anything outside this section will get overwritten. -->
Allow ICMP redirects to override OSPF generated routes.
<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-Editable-End -->

<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-DFProperties-Begin -->
**Description framework properties**:

| Property name | Property value |
|:--|:--|
| Format | chr (string) |
| Access Type | Add, Delete, Get, Replace |
<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-DFProperties-End -->

<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-AdmxBacked-Begin -->
<!-- ADMX-Not-Found -->
> [!TIP]
> This is an ADMX-backed policy and requires SyncML format for configuration. For an example of SyncML format, refer to [Enabling a policy](./understanding-admx-backed-policies.md#enabling-a-policy).

**ADMX mapping**:

| Name | Value |
|:--|:--|
| Name | Pol_MSS_EnableICMPRedirect |
| ADMX File Name | mss-legacy.admx |
<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-AdmxBacked-End -->

<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-Examples-Begin -->
<!-- Add any examples for this policy here. Examples outside this section will get overwritten. -->
<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-Examples-End -->

<!-- AllowICMPRedirectsToOverrideOSPFGeneratedRoutes-End -->

<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-Begin -->
## AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers

<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-Applicability-Begin -->
| Scope | Editions | Applicable OS |
|:--|:--|:--|
| :heavy_check_mark: Device <br> :x: User | :x: Home <br> :heavy_check_mark: Pro <br> :heavy_check_mark: Enterprise <br> :heavy_check_mark: Education <br> :heavy_check_mark: Windows SE | :heavy_check_mark: Windows 10, version 1803 [10.0.17134] and later |
<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-Applicability-End -->

<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-OmaUri-Begin -->
```Device
./Device/Vendor/MSFT/Policy/Config/MSSLegacy/AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers
```
<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-OmaUri-End -->

<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-Description-Begin -->
<!-- Description-Source-Not-Found -->
<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-Description-End -->

<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-Editable-Begin -->
<!-- Add any additional information about this policy here. Anything outside this section will get overwritten. -->
Allow the computer to ignore NetBIOS name release requests except from WINS servers.
<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-Editable-End -->

<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-DFProperties-Begin -->
**Description framework properties**:

| Property name | Property value |
|:--|:--|
| Format | chr (string) |
| Access Type | Add, Delete, Get, Replace |
<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-DFProperties-End -->

<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-AdmxBacked-Begin -->
<!-- ADMX-Not-Found -->
> [!TIP]
> This is an ADMX-backed policy and requires SyncML format for configuration. For an example of SyncML format, refer to [Enabling a policy](./understanding-admx-backed-policies.md#enabling-a-policy).

**ADMX mapping**:

| Name | Value |
|:--|:--|
| Name | Pol_MSS_NoNameReleaseOnDemand |
| ADMX File Name | mss-legacy.admx |
<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-AdmxBacked-End -->

<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-Examples-Begin -->
<!-- Add any examples for this policy here. Examples outside this section will get overwritten. -->
<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-Examples-End -->

<!-- AllowTheComputerToIgnoreNetBIOSNameReleaseRequestsExceptFromWINSServers-End -->

<!-- IPSourceRoutingProtectionLevel-Begin -->
## IPSourceRoutingProtectionLevel

<!-- IPSourceRoutingProtectionLevel-Applicability-Begin -->
| Scope | Editions | Applicable OS |
|:--|:--|:--|
| :heavy_check_mark: Device <br> :x: User | :x: Home <br> :heavy_check_mark: Pro <br> :heavy_check_mark: Enterprise <br> :heavy_check_mark: Education <br> :heavy_check_mark: Windows SE | :heavy_check_mark: Windows 10, version 1803 [10.0.17134] and later |
<!-- IPSourceRoutingProtectionLevel-Applicability-End -->

<!-- IPSourceRoutingProtectionLevel-OmaUri-Begin -->
```Device
./Device/Vendor/MSFT/Policy/Config/MSSLegacy/IPSourceRoutingProtectionLevel
```
<!-- IPSourceRoutingProtectionLevel-OmaUri-End -->

<!-- IPSourceRoutingProtectionLevel-Description-Begin -->
<!-- Description-Source-Not-Found -->
<!-- IPSourceRoutingProtectionLevel-Description-End -->

<!-- IPSourceRoutingProtectionLevel-Editable-Begin -->
<!-- Add any additional information about this policy here. Anything outside this section will get overwritten. -->
IP source routing protection level (protects against packet spoofing).
<!-- IPSourceRoutingProtectionLevel-Editable-End -->

<!-- IPSourceRoutingProtectionLevel-DFProperties-Begin -->
**Description framework properties**:

| Property name | Property value |
|:--|:--|
| Format | chr (string) |
| Access Type | Add, Delete, Get, Replace |
<!-- IPSourceRoutingProtectionLevel-DFProperties-End -->

<!-- IPSourceRoutingProtectionLevel-AdmxBacked-Begin -->
<!-- ADMX-Not-Found -->
> [!TIP]
> This is an ADMX-backed policy and requires SyncML format for configuration. For an example of SyncML format, refer to [Enabling a policy](./understanding-admx-backed-policies.md#enabling-a-policy).

**ADMX mapping**:

| Name | Value |
|:--|:--|
| Name | Pol_MSS_DisableIPSourceRouting |
| ADMX File Name | mss-legacy.admx |
<!-- IPSourceRoutingProtectionLevel-AdmxBacked-End -->

<!-- IPSourceRoutingProtectionLevel-Examples-Begin -->
<!-- Add any examples for this policy here. Examples outside this section will get overwritten. -->
<!-- IPSourceRoutingProtectionLevel-Examples-End -->

<!-- IPSourceRoutingProtectionLevel-End -->

<!-- IPv6SourceRoutingProtectionLevel-Begin -->
## IPv6SourceRoutingProtectionLevel

<!-- IPv6SourceRoutingProtectionLevel-Applicability-Begin -->
| Scope | Editions | Applicable OS |
|:--|:--|:--|
| :heavy_check_mark: Device <br> :x: User | :x: Home <br> :heavy_check_mark: Pro <br> :heavy_check_mark: Enterprise <br> :heavy_check_mark: Education <br> :heavy_check_mark: Windows SE | :heavy_check_mark: Windows 10, version 1803 [10.0.17134] and later |
<!-- IPv6SourceRoutingProtectionLevel-Applicability-End -->

<!-- IPv6SourceRoutingProtectionLevel-OmaUri-Begin -->
```Device
./Device/Vendor/MSFT/Policy/Config/MSSLegacy/IPv6SourceRoutingProtectionLevel
```
<!-- IPv6SourceRoutingProtectionLevel-OmaUri-End -->

<!-- IPv6SourceRoutingProtectionLevel-Description-Begin -->
<!-- Description-Source-Not-Found -->
<!-- IPv6SourceRoutingProtectionLevel-Description-End -->

<!-- IPv6SourceRoutingProtectionLevel-Editable-Begin -->
<!-- Add any additional information about this policy here. Anything outside this section will get overwritten. -->
IPv6 source routing protection level (protects against packet spoofing).
<!-- IPv6SourceRoutingProtectionLevel-Editable-End -->

<!-- IPv6SourceRoutingProtectionLevel-DFProperties-Begin -->
**Description framework properties**:

| Property name | Property value |
|:--|:--|
| Format | chr (string) |
| Access Type | Add, Delete, Get, Replace |
<!-- IPv6SourceRoutingProtectionLevel-DFProperties-End -->

<!-- IPv6SourceRoutingProtectionLevel-AdmxBacked-Begin -->
<!-- ADMX-Not-Found -->
> [!TIP]
> This is an ADMX-backed policy and requires SyncML format for configuration. For an example of SyncML format, refer to [Enabling a policy](./understanding-admx-backed-policies.md#enabling-a-policy).

**ADMX mapping**:

| Name | Value |
|:--|:--|
| Name | Pol_MSS_DisableIPSourceRoutingIPv6 |
| ADMX File Name | mss-legacy.admx |
<!-- IPv6SourceRoutingProtectionLevel-AdmxBacked-End -->

<!-- IPv6SourceRoutingProtectionLevel-Examples-Begin -->
<!-- Add any examples for this policy here. Examples outside this section will get overwritten. -->
<!-- IPv6SourceRoutingProtectionLevel-Examples-End -->

<!-- IPv6SourceRoutingProtectionLevel-End -->

<!-- MSSLegacy-CspMoreInfo-Begin -->
<!-- Add any additional information about this CSP here. Anything outside this section will get overwritten. -->
<!-- MSSLegacy-CspMoreInfo-End -->

<!-- MSSLegacy-End -->

## Related articles

[Policy configuration service provider](policy-configuration-service-provider.md)