D-Link DIR-816 User Manual page 83

Section 6 - Troubleshooting
3. Why can't I connect to certain sites or send and receive emails when connecting through my router?
If you are having a problem sending or receiving email, or connecting to secure sites such as eBay, banking sites, and Hotmail, we suggest lowering
the MTU in increments of ten (Ex. 1492, 1482, 1472, etc).
Note: AOL DSL+ users must use MTU of 1400.
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 (Windows
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• 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, 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
(1452+28=1480).
D-Link DIR-816 User Manual
NT, 2000, and XP users type in cmd) and press Enter (or click OK).
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