Changing the MaxMTU and other Network Settings

There are four network settings that can be configured so when dialing to an ISP, you should get somewhat greater throughput.

They are the MaxMTU, MaxMSS and DefaultRcvWindow, and DefaultTTL

MaxMTU and MaxMSS

1. Start REGEDIT
2. Go to Hkey_Local_Machine / System / CurrentControlset / Services / Class / netTrans / 000n
   (where n is your particular network adaptor binding.)
3. Right click on the right panel
4. Select New / String Value
5. Type in MaxMTU
6. Double click on it and enter then the number you want. The usual change is to 576
7. Similarly, you can add MaxMSS and give it a value of 536 (or 40 less that your Max MTU setting)

DefaultRcvWindows and DefaultTTL

1. Start REGEDIT
2. Go to HKEY_LOCAL_MACHINE \ System \ CurrentControlSet \ Services \ VxD \ MSTCP
3. Add a new string DefaultRcvWindow and give it a value of 2144 (or 4 times your MaxMSS setting)
4. Add a new string DefaultTTL and give it a value of 60-64

To find out the optimal setting, go to Determining Optimal MaxMTU Setting to Use