Enable automatic path MTU size detection and improve Internet throughput.

[ben2ong2]

As stated on previous tip (Tip 52), MTP size plays an important role in deciding Internet speed. But its not so easy to determine the right value of MTU. For those of us who fall in this category and would prefer computer to find that for us, follow trick may work. I can not say with confidence whether this would work across all network but it should and there is no harm in trying it out. Now before I do that let me tell you what this action will do. Applying this trick, you would ask computer to automatically find out the maximum MTU size possible in the connection path to a host. This value could be different for different sites. I think this trick should pick the lowest common denominator across a particular path. Typically If MTU size is not optimized, this job has to be done by a router which would mean a significant waste of time (small chunks adds to a considerable loss if you imagine that there are billions of packets involved across the whole Internet) resulting in poor throughout and congestion on cyber lanes. All right this key is called EnablePMTUDiscovery.Again this is a You are not allowed to view links. Register or Login Registry by going to START-RUN and entering REGEDIT and Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\ ID for Adapter. For this right click on right pane and add a key by the name EnablePMTUDiscovery. For this key you can add a DWORD boolean value of 0 or 1 with 1 being TRUE (value that enables auto detection). Since we are trying this tweak, set to 1 and enable the TCP to attempt to discover the MTU size over the specific path to host. Microsoft has an interesting article on many similar tips You are not allowed to view links. Register or Login and is titled TCP/IP and NBT Configuration Parameters for Windows (Q120642).