To find the proper MTU Size, you’ll have to do a special ping of the destination you’re trying to go to. A destination could be another computer, or a URL.
1. Click on the Start button, then select the Run option.
2. In the “Open” field type in command (If you’re using Windows 2K/NT/XP use CMD instead).
3. Once the window opens, you’ll need to do a special ping. It should be formatted:
ping [url] [-f] [-l] [MTU value] [Enter] an example would be:
ping yahoo.com –f –l 1472
ping yahoo.com –f –l 1462
ping yahoo.com –f –l 1452
You should always start at 1472 and work your way down by 10 each time. Once you get a reply, go up by 2 until you get a fragmented packet. Take that value and add 28 to the value to account for the various TCP/IP headers. For example, lets say that 1452 was the proper value, the actual MTU size would be 1480, which is the optimum for the network we’re working with.
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