Windows 2008 mtu registry

The manually set or configure MTU size will take precedence over the MTU that the network adapter detects dynamically. Note that MTU is set on each of the network interfaces on the computer. Use the following command to show all network interfaces available :. Note that if a value greater than the dynamically-determined MTU, the system uses the value of the dynamically-determined MTU instead.

If you want to change the MTU for ipv6 network interface, change the ipv4 in commands above to ipv6. To verify the change of MTU has been successfully saved, use the following command:. Replace ipv4 with ipv6 if necessary. This method is preferred because the packet size is lowered for only the problematic segment. Black hole detection increases the maximum number of retransmissions for a specific segment. To enable PMTU black hole detection, follow these steps:. Click Start , click Run , type regedit, and then click OK.

In the Value data box, type 1, and then click OK. This enables the routers to fragment the packet and send the packet across the networks.

This method affects packets sent to all destinations. Most of the time, the performance will be at acceptable levels with a packet size of In the Value data box, type 0, and then click OK. If you set the MTU size for a network interface manually, this setting overrides the default MTU for the network interface. The MTU size is the maximum packet size in bytes that the transport will transmit over the underlying network. This method affects packets sent to all destinations and may significantly affect the performance, depending on the MTU size that you set.

To set the MTU size for the network interface, follow these steps:. For more information, click the following article number to view the article in the Microsoft Knowledge Base:. Need more help? Expand your skills. Get new features first. Was this information helpful? Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:. Windows 7 and Windows Server R2 file information and notes.

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