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Windows Server



    

EnablePMTUDiscovery    

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EnablePMTUDiscovery



Apr
25

EnablePMTUDiscovery

 

EnablePMTUDiscovery is a registry key that can enable the windows operating system to discover the working MTU size in effect itself by sending packets of variable size to the destination. By sending packets of data in variable sizes the Windows Operating System can determine what MTU size will be set for future data transfers so that the packets do reach the destination successfully and not drop in the middle of the path; EnablePMTUDiscovery enabled the Windows OS to discover the Packet Maximum Transfer Unit that will work in the network for flawless network communication.

 

http://technet.microsoft.com/library/cc957539

EnablePMTUDiscovery

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

 

Data type

Range

Default value

REG_DWORD

0 | 1

1

 

Description

Determines whether TCP uses a fixed, default maximum transmission unit (MTU) or attempts to detect the actual MTU.

By discovering the Path MTU and limiting TCP segments to this size, TCP can eliminate fragmentation at routers connecting networks with different MTUs. Fragmentation reduces TCP throughput and increases network congestion.

By default, this entry applies to all interfaces. However, the MTU can be reduced for any particular interface by changing the default value of the MTU entry in the subkey for that interface.

 

Value

Meaning

0

TCP uses an MTU of 576 bytes for all connections to computers outside the local subnet.

1

TCP attempts to discover the MTU of the path to a remote host.

 

clip_image001 Note

Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.

Related Entries

 

clip_image002

EnablePMTUBHDetect

 

clip_image002[1]

MTU

 

http://technet.microsoft.com/library/cc957539

 



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ebhakt
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