Wednesday, February 16, 2011

Items to check if network packets captured do not show DSCP markings for OCS 2007 R2

To follow up on my previous post about DSCP markings for OCS 2007 R2 (http://terenceluk.blogspot.com/2011/02/enabling-dscp-marking-for-ocs-2007-r2.html), I’ve written extra notes on the items I had to check when I noticed some workstations or servers did not appear to have the expected DSCP markings when performing network captures.  This post serves to publish those notes that I would be able to reference to in the future:

Windows XP/Vista/7 32-Bit Desktops

Even if you’ve pushed these settings out via GPO, there will be times when the desktops won’t have the proper settings so if network packet captures do not show DSCP markings, perform the following checks.

Make sure that the following registry keys exist for the workstation:

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Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RTC]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RTC\Transport]

"QosEnabled"=dword:00000001

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Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Psched]

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Psched\DiffservByteMappingConforming]

"ServiceTypeControlledLoad"=dword:00000022

"ServiceTypeGuaranteed"=dword:0000002e

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Psched\DiffservByteMappingNonConforming]

"ServiceTypeControlledLoad"=dword:00000022

"ServiceTypeGuaranteed"=dword:0000002e

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Start up Group Policy editor (gpedit.msc) for the desktop:

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Navigate to Computer Configuration –> Administrative Templates –> Network –> QoS Packet Scheduler –> DSCP value of conforming packets and make sure that:

1. Controlled load service type – Is set to Enabled with the value of 34.

2. Guaranteed service type – Is set to Enabled with the value of 46.

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Navigate to Computer Configuration  Administrative Templates –> Network –> QoS Packet Scheduler –> DSCP value of non-conforming packets and make sure that:

1. Controlled load service type – Is set to Enabled with the value of 34.

2. Guaranteed service type – Is set to Enabled with the value of 46.

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Use Wireshark to capture the packets for the workstation’s interface and make sure that the UDP voice packets originating from the desktop has:

Differentiated Services Field: 0xb8 (DSCP 0x2e: Expedited Forwarding; ECN: 0x00) markings.

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Windows XP/Vista/7 64-Bit Desktops and Windows Server 2003/2008 64-Bit Servers

Even if you’ve pushed these settings out via GPO, there will be times when the desktops and/or servers won’t have the proper settings so if network packet captures do not show DSCP markings, perform the following checks.

Make sure that the following registry keys exist for the workstation and servers:

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\RTC]

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\RTC\Transport]

"QoSEnabled"=dword:00000001

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-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Policies\Microsoft\Windows\Psched]

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Policies\Microsoft\Windows\Psched\DiffservByteMappingConforming]

"ServiceTypeControlledLoad"=dword:00000022

"ServiceTypeGuaranteed"=dword:0000002e

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Policies\Microsoft\Windows\Psched\DiffservByteMappingNonConforming]

"ServiceTypeControlledLoad"=dword:00000022

"ServiceTypeGuaranteed"=dword:0000002e

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Start up Group Policy editor (gpedit.msc) for the desktop:

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Navigate to Computer Configuration –> Administrative Templates –> Network –> QoS Packet Scheduler –> DSCP value of conforming packets and make sure that:

1. Controlled load service type – Is set to Enabled with the value of 34.

2. Guaranteed service type – Is set to Enabled with the value of 46.

clip_image032

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Navigate to Computer Configuration –> Administrative Templates –> Network –> QoS Packet Scheduler –> DSCP value of non-conforming packets and make sure that:

1. Controlled load service type – Is set to Enabled with the value of 34.

2. Guaranteed service type – Is set to Enabled with the value of 46.

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Use Wireshark to capture the packets for the workstation’s interface and make sure that the UDP voice packets originating from the desktop/server has:

Differentiated Services Field: 0xb8 (DSCP 0x2e: Expedited Forwarding; ECN: 0x00) markings.

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