Optimising the connection

Open the following [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP].

Right click in the right hand side of it. click on New & String value. Make 2, one called DefaultRcvWindow & the other DefaultTTL. Once they have been created right click on each of them select "Modify". For DefaultRcvWindow I suggest using 4380, 3*(MTU-40) & for DefaultTTL 32.

Now change the MTU & MSS (Maximum transmission unit & Maximum segment size). Windows is optimized for Network connections & not for people using modems to connect to the Internet. To do so, follow the steps below.

1. You have to find the details of your Dial-Up Adapter.
2. Find the key [HKEY_LOCAL_MACHINE\Enum\Root\Net\000x] and within there will be one or more sub-keys such as 0000, 0001 ...
3. Open each key and find the one that contains the value of 'DeviceDesc' equal to 'Dial-Up Adapter'.
4. Within that key there will also be another sub-key named 'Bindings'. Open the 'Bindings' sub-key and you will find a string name like 'MSTCP\0000'. Take note of the four-digit number after 'MSTCP' (in this case 0000) and use it in the next step.
5. Now go to the key [HKEY_LOCAL_MACHINE\Enum\Network\MSTCP] and expand the sub-key with the same four-digit number as from the previous step.
6. In this key you will find a value called 'Driver' and it will be equal to something similar to 'NetTrans\0000'. Take note of this four-digit number and use it in the next step.
7. Now open the key [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Class\NetTrans] below there will be one or more sub-key's. Expand the key with the name equal to the four digit number from the previous step.
8. Within this key create a new string value named MaxMTU and set it to 1500, and also add a string value named MaxMSS and set it to 1460. The MaxMSS (read note at top) should always be the MaxMTU minus 40.
9. Next go into [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Class\Net\
   000x\Ndi\params\IPMTU\enum], in here you will find values for Automatic, Large, Medium, Small. Right click in the right hand side of the box & make a new String value, 1500, right click it & select modify, type in Automatic then click ok. Delete all the other values there, e.g. Large - Small & the other Automatic (if any).
10. Now go into [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Class\Net\000x]. Right click on IPMTU & select modify, change this value to whatever your current MTU you (e.g. 1500).
11. Go into [HKEY_LOCAL_MACHINE\System\CurrentControlSet\
    Services\Class\Net\0000\Ndi\params\IPMTU], change the default value to your current MTU.
12. Then exit the registry and restart your computer.

You can change the above settings as necessary.

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