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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.
• Click on Start and then click Run.
• Windows® 95, 98, and Me users type in command (WindowsR NT, 2000, XP, VistaR, 7, 8.x,
and 10 users type in cmd) and press Enter (or click OK).
• Once the window opens, you'll need to do a special ping.
Use the following syntax: ping [url] [-f] [-l] [MTU value]
Example: ping yahoo.com -f -l 1472
You should 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, let's 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 (1452+28=1480).
Once you find your MTU, you can now configure your router with the proper MTU size.
To change the MTU rate on your router follow the steps below:
• Open your browser, enter the IP address of your router (10.0.0.) and click OK.
• Enter your username (admin) and password (blank by default). Click OK to enter the web configuration page for the device.
• Click on Setup and then click Network > WAN Settings.
• To change the MTU, enter the number in the MTU field and click Save Settings to save your settings.
• Test your email. If changing the MTU does not resolve the problem, continue changing the MTU in increments of ten.
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