Symptoms

Consider the following scenario:

  • You use a DHCP unique identifier (DUID) as a unique identifier in a network environment.

  • You use DUID and cable modem identifier mapping in the network.

  • You have client computers that are running Windows 7 or Windows Server 2008 R2 in the network environment.

  • One of the client computers sends a DHCPv6 message from a cable modem.

  • Another client computer sends a DHCPv6 message that has the same DUID from a different cable modem.

  • The record for the new DUID and cable modem mapping overwrites the previous record.

In this scenario, the client computers have no network connectivity.

Notes

  • When you run the sysprep command without the /generalize option or you use a different ghost imaging software to build the operating system, the duplicate DUID issue occurs.

  • When you run the sysprep command together with the /generalize option, a DHCP client API is called to clear the value of the DUID.

  • The DUID of a DHCPv6 message is generated the first time that the DHCP client service starts. The value of the DUID is stored in the Dhcpv6DUID registry entry. If you delete the value of the registry entry, the value is recreated when an interface is enabled or connected on the client computer. The Dhcpv6DUID registry entry is located under the following registry subkey:

    \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\TCPIP6\Parameters

Resolution

Update information

How to obtain this update

Microsoft Update

This update is available from the following Microsoft Update website:

http://update.microsoft.com

Microsoft Download Center

The following files are available for download from the Microsoft Download Center:

Operating system

Update

All supported x86-based versions of Windows 7

Download Download the update package now.

All supported x64-based versions of Windows 7

Download Download the update package now.

All supported x64-based versions of Windows Server 2008 R2

Download Download the update package now.

All supported IA-64-based versions of Windows Server 2008 R2

Download Download the update package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Prerequisites

To apply this update, you must be running one of the following operating systems:

  • Windows 7

  • Windows 7 Service Pack 1 (SP1)

  • Windows Server 2008 R2

  • Windows Server 2008 R2 Service Pack 1 (SP1)

For more information about how to obtain a Windows 7 or a Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To apply this update, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this update.

Update replacement information

This update does not replace a previously released update.

File information

The global version of this update installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 7 and Windows Server 2008 R2 file information notes


Important Windows 7 updates and Windows Server 2008 R2 updates are included in the same packages. However, updates on the Update Request page are listed under both operating systems. To request the update package that applies to one or both operating systems, select the update that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each update applies to.

  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    0.16xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    GDR

    6.1.760
    1.17xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    GDR

    6.1.760
    1.22xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain updates in addition to widely released fixes.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

File name

File version

File size

Date

Time

Dhcpcmonitor.dll.mui

6.1.7600.16385

4,096

14-Jul-2009

01:03

Dhcpcore.dll.mui

6.1.7601.17514

20,992

20-Nov-2010

12:09

Dhcpcore6.dll.mui

6.1.7601.17970

17,920

09-Oct-2012

17:31

Dhcpcsvc.dll.mui

6.1.7600.16385

2,560

14-Jul-2009

01:02

Dhcpcsvc6.dll.mui

6.1.7601.17970

17,920

09-Oct-2012

17:54

Dhcpcmonitor.dll.mui

6.1.7600.16385

4,096

14-Jul-2009

01:03

Dhcpcore.dll.mui

6.1.7601.17514

20,992

20-Nov-2010

12:09

Dhcpcore6.dll.mui

6.1.7601.22130

17,920

09-Oct-2012

17:21

Dhcpcsvc.dll.mui

6.1.7600.16385

2,560

14-Jul-2009

01:02

Dhcpcsvc6.dll.mui

6.1.7601.22130

17,920

09-Oct-2012

17:32

Dhcpclientdll.ptxml

Not applicable

5,597

13-Jul-2009

20:24

Dhcpcmonitor.dll

6.1.7600.16385

11,264

14-Jul-2009

01:15

Dhcpcore.dll

6.1.7601.17514

254,464

20-Nov-2010

12:18

Dhcpcore6.dll

6.1.7601.17970

193,536

09-Oct-2012

17:40

Dhcpcsvc.dll

6.1.7600.16385

61,952

14-Jul-2009

01:15

Dhcpcsvc6.dll

6.1.7601.17970

44,032

09-Oct-2012

17:40

Dhcpclientdll.ptxml

Not applicable

5,597

13-Jul-2009

20:24

Dhcpcmonitor.dll

6.1.7600.16385

11,264

14-Jul-2009

01:15

Dhcpcore.dll

6.1.7601.22130

257,024

09-Oct-2012

17:29

Dhcpcore6.dll

6.1.7601.22130

195,072

09-Oct-2012

17:29

Dhcpcsvc.dll

6.1.7600.16385

61,952

14-Jul-2009

01:15

Dhcpcsvc6.dll

6.1.7601.22130

44,032

09-Oct-2012

17:29


File name

File version

File size

Date

Time

Dhcpcmonitor.dll.mui

6.1.7600.16385

4,096

14-Jul-2009

01:30

Dhcpcore.dll.mui

6.1.7601.17514

20,992

20-Nov-2010

12:55

Dhcpcore6.dll.mui

6.1.7601.17970

17,920

09-Oct-2012

18:18

Dhcpcsvc.dll.mui

6.1.7600.16385

2,560

14-Jul-2009

01:28

Dhcpcsvc6.dll.mui

6.1.7601.17970

17,920

09-Oct-2012

18:18

Dhcpcmonitor.dll.mui

6.1.7600.16385

4,096

14-Jul-2009

01:30

Dhcpcore.dll.mui

6.1.7601.17514

20,992

20-Nov-2010

12:55

Dhcpcore6.dll.mui

6.1.7601.22130

17,920

09-Oct-2012

18:18

Dhcpcsvc.dll.mui

6.1.7600.16385

2,560

14-Jul-2009

01:28

Dhcpcsvc6.dll.mui

6.1.7601.22130

17,920

09-Oct-2012

18:29

Dhcpclientdll.ptxml

Not applicable

5,597

13-Jul-2009

20:19

Dhcpcmonitor.dll

6.1.7600.16385

13,824

14-Jul-2009

01:40

Dhcpcore.dll

6.1.7601.17514

317,952

20-Nov-2010

13:26

Dhcpcore6.dll

6.1.7601.17970

226,816

09-Oct-2012

18:17

Dhcpcsvc.dll

6.1.7600.16385

87,040

14-Jul-2009

01:40

Dhcpcsvc6.dll

6.1.7601.17970

55,296

09-Oct-2012

18:17

Dhcpclientdll.ptxml

Not applicable

5,597

13-Jul-2009

20:19

Dhcpcmonitor.dll

6.1.7600.16385

13,824

14-Jul-2009

01:40

Dhcpcore.dll

6.1.7601.22130

318,976

09-Oct-2012

18:29

Dhcpcore6.dll

6.1.7601.22130

226,816

09-Oct-2012

18:29

Dhcpcsvc.dll

6.1.7600.16385

87,040

14-Jul-2009

01:40

Dhcpcsvc6.dll

6.1.7601.22130

55,296

09-Oct-2012

18:29


File name

File version

File size

Date

Time

Dhcpcmonitor.dll.mui

6.1.7600.16385

4,096

14-Jul-2009

01:39

Dhcpcore.dll.mui

6.1.7601.17514

20,992

20-Nov-2010

10:14

Dhcpcore6.dll.mui

6.1.7601.17970

17,920

09-Oct-2012

16:58

Dhcpcsvc.dll.mui

6.1.7600.16385

2,560

14-Jul-2009

01:33

Dhcpcsvc6.dll.mui

6.1.7601.17970

17,920

09-Oct-2012

17:07

Dhcpclientdll.ptxml

Not applicable

5,597

13-Jul-2009

20:19

Dhcpcmonitor.dll

6.1.7600.16385

27,136

14-Jul-2009

01:46

Dhcpcore.dll

6.1.7601.17514

617,984

20-Nov-2010

10:25

Dhcpcore6.dll

6.1.7601.17970

466,944

09-Oct-2012

17:00

Dhcpcsvc.dll

6.1.7600.16385

162,304

14-Jul-2009

01:46

Dhcpcsvc6.dll

6.1.7601.17970

87,552

09-Oct-2012

17:00

Dhcpclientdll.ptxml

Not applicable

5,597

13-Jul-2009

20:19

Dhcpcmonitor.dll

6.1.7600.16385

27,136

14-Jul-2009

01:46

Dhcpcore.dll

6.1.7601.22130

621,056

09-Oct-2012

17:23

Dhcpcore6.dll

6.1.7601.22130

466,432

09-Oct-2012

17:23

Dhcpcsvc.dll

6.1.7600.16385

162,304

14-Jul-2009

01:46

Dhcpcsvc6.dll

6.1.7601.22130

87,552

09-Oct-2012

17:23




Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

File name

X86_microsoft-windows-d..lient-dll.resources_31bf3856ad364e35_6.1.7601.17970_en-us_57a9912a1886b664.manifest

File version

Not applicable

File size

4,822

Date (UTC)

10-Oct-2012

Time (UTC)

16:42

File name

X86_microsoft-windows-d..lient-dll.resources_31bf3856ad364e35_6.1.7601.22130_en-us_585e45c7318419ac.manifest

File version

Not applicable

File size

4,822

Date (UTC)

10-Oct-2012

Time (UTC)

16:42

File name

X86_microsoft-windows-dhcp-client-dll_31bf3856ad364e35_6.1.7601.17970_none_d91cba738d061f6b.manifest

File version

Not applicable

File size

95,014

Date (UTC)

10-Oct-2012

Time (UTC)

16:42

File name

X86_microsoft-windows-dhcp-client-dll_31bf3856ad364e35_6.1.7601.22130_none_d9d16f10a60382b3.manifest

File version

Not applicable

File size

95,014

Date (UTC)

10-Oct-2012

Time (UTC)

16:42


File name

Amd64_microsoft-windows-d..lient-dll.resources_31bf3856ad364e35_6.1.7601.17970_en-us_b3c82cadd0e4279a.manifest

File version

Not applicable

File size

4,824

Date (UTC)

10-Oct-2012

Time (UTC)

16:48

File name

Amd64_microsoft-windows-d..lient-dll.resources_31bf3856ad364e35_6.1.7601.22130_en-us_b47ce14ae9e18ae2.manifest

File version

Not applicable

File size

4,824

Date (UTC)

10-Oct-2012

Time (UTC)

16:48

File name

Amd64_microsoft-windows-dhcp-client-dll_31bf3856ad364e35_6.1.7601.17970_none_353b55f7456390a1.manifest

File version

Not applicable

File size

95,032

Date (UTC)

10-Oct-2012

Time (UTC)

16:48

File name

Amd64_microsoft-windows-dhcp-client-dll_31bf3856ad364e35_6.1.7601.22130_none_35f00a945e60f3e9.manifest

File version

Not applicable

File size

95,032

Date (UTC)

10-Oct-2012

Time (UTC)

16:48


File name

Ia64_microsoft-windows-d..lient-dll.resources_31bf3856ad364e35_6.1.7601.17970_en-us_57ab35201884bf60.manifest

File version

Not applicable

File size

4,823

Date (UTC)

10-Oct-2012

Time (UTC)

15:54

File name

Ia64_microsoft-windows-dhcp-client-dll_31bf3856ad364e35_6.1.7601.17970_none_d91e5e698d042867.manifest

File version

Not applicable

File size

95,023

Date (UTC)

10-Oct-2012

Time (UTC)

15:54

File name

Ia64_microsoft-windows-dhcp-client-dll_31bf3856ad364e35_6.1.7601.22130_none_d9d31306a6018baf.manifest

File version

Not applicable

File size

95,023

Date (UTC)

10-Oct-2012

Time (UTC)

15:54


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