Use IPv4 Instead of IPv6

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How to use IPv4 prefers instead of IPv6 using Windows

The affine coexistence of IPv6 and IPv4 for resources in the transition period is not necessarily desirable for network environments with Windows domains, unexpected disruptions in name resolution can occur, connections to network drives can fail, or authentication to the domain is temporarily not available more possible, often after an IPv6 capable router has been integrated into the network, If clients search in vain for a domain via the AD Domain Services, since IPv6 is preferred, in coexistence with IPv4, the IPv6 protocol must often be configured system-wide.

Introduction

Microsoft Windows Vista, Windows Server 2008, and later versions of Windows use RFC 3484 and a prefix table to determine which address to use when multiple addresses are available for a Domain Name System (DNS) name.

By default, Windows prefers global IPv6 unicast addresses over IPv4 addresses.

Steps to favor IPv4

Internet protocol version 6 (IPv6) is a mandatory component of Windows 10, as well as from Windows Server 2008 and newer. It is recommended to use “Preferably use IPv4 instead of IPv6” in prefix policies instead of disabling IPv6.

The preference of IPv4 over IPv6 can be enabled by changing the registry key DisabledComponents with the registry value Hex 0x20 (Dec 32).

 Copy Paste and run in command prompt as admin.

Registry_Key_DisabledComponents
Registry Key DisabledComponents

The registration method to favor Windows IPv4 over IPv6 is a general, but less system-compliant solution. At the end, Windows changes the prefix policy table as shown in the following section.

When the netsh tool is executed, the policy table shows output with the prefix, the priority and label.

The Windows 10 default prefix policy setting is as follows:

Please note that IPv6 addresses (:: / 0) are preferred over IPv4 addresses (:: / 96 and :: ffff: 0: 0/96).

Increasing the priority for the IPv4 prefix with set prefixpolicy.

::ffff:0:0/96 are the IPv4 Prefix, 50 is the Priority (very high) and 0 are the Label.

To configure IPv6, change the following registry value based on the following table.

IPv6-Functionality Registry-key value Comment

Prefer IPv4 over IPv6

Dec 32

 

Hex 0x20

Bin xx1x xxxx

Recommended instead of disabling them.
Disable IPv6 Dec 255

 

Hex 0xFF

Bin 1111 1111

For more information, see article KB3014406 if there is a startup delay after disabling IPv6 in Windows 7 SP1 or Windows Server 2008 R2 SP1.

In addition, the system start is delayed by 5 seconds if IPv6 is deactivated by incorrectly setting the DisabledComponents registry setting to the value 0xfffffff. The correct value must be “0xff”.

The registry value “DisabledComponents” does not affect the status of the check box. Even if the DisabledComponents registry key is set to IPv6, the check box on the Network tab can be selected for each interface. This behavior is normal and by design.

Deactivating IPv6 on all non-tunnel interfaces Dec 16

 

Hex 0x10

Bin xxx1 xxxx

 
Deactivating IPv6 on all tunnel interfaces Dec 1

 

Hex 0x01

Bin xxxx xxx1

 
Deactivate IPv6 on all nontunnel interfaces (except loopback) and on the IPv6 tunnel interface Dec 17

 

Hex 0x11

Bin xxx1 xxx1

 
Prefer IPv6 over IPv4 Bin xx0x xxxx  
Re-enable IPv6 on all non-tunnel interfaces Bin xxx0 xxxx  
Re-enable IPv6 on all tunnel interfaces Bin xxx xxx0  
Re-enable IPv6 on all non-tunnel interfaces and on IPv6 tunnel interfaces Bin xxx0 xxx0  

Source URL: Advanced guide to configuring IPv6 in Windows

The change requires a restart. So that the setting does not have to be carried out manually on every PC, the action can be made using an ADMX file with a group policy setting.

IPv6 is deactivated with the following REG entry.

Whereby IPv6 remains activated for the loopback interface. However, this should not have a negative impact, as it also ensures that IPv4 is preferred.

If IPv6 is to be reactivated, the following key applies.

Checking for existing IPv6 addresses in PowerShell.

ipconfig_select-string_ipv6

Prefer IPv4 in PowerShell

In PowerShell, IPv4 is preferred as follows.

PowerShell must be open with elevated rights. The change requires a restart.

Determine which IP version is being answered.

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