Saturday, September 1, 2007

116. Automatic MTU Size Detection

If MTU size is not optimized, this job has to be done by a router which would mean a
significant waste of time resulting in poor throughout. We have a solution to this issue. All
you have to do is to enable a key called EnablePMTUDiscovery in the following area.

KEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\
ID_for_the_Adapter. Right click on right pane and add a DWORD key by the name
EnablePMTUDiscovery. A value of 1 will enable the TCP to attempt to discover the MTU
size over the specific path to host.

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