Testing for MTU on a Good Line (1)

If you know what MTU your ISP uses follow these steps:

1. Select your Dial-Up adapter from the dropdown box.
   
2. If you are not connected to a TCP LAN check the RWIN box (if it isn't already checked).
   
3. Press "Optimum Settings".
   
4. Press "Change MTU" or right click and select it from the menu
   
5. Enter your ISP's MTU in the dialog box and click OK.
   
6. Press "Update Registry".
   
7. Close MTUSpeed and reboot your computer..
   

If you do not know what MTU your ISP uses you can discover it as follows:

8. Run MTUSpeed.
   
9. If you get a dialogue box telling you that the required keys do not exist then go here
   
10. If you do not get the dialogue box (i.e., there are MTU settings in your registry) press "Remove Settings" then "Update Registry". You will then see the dialogue mentioned above.
    
11. Close MTUSpeed, reboot your computer, run MTUSpeed and follow the instructions on the next page

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