D-Link DIR-400 - Why can’t I connect to certain sites or send and receive emails when connecting through my router?

95D-Link DIR-400 User Manual
Section 11 - 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/or Hotmail, we suggest gradually lowering the MTU in increments of ten (Ex. 1492, 1482, 1472, etc).
Note: AOL DSL+ users must use MTU of 1400.
To nd 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.
• Type in command and press Enter (or click OK).
• Once the window opens, you’ll need “ping” a URL. Use the following syntax:
ping [url] [-f] [-l] [MTU value]
Example: ping yahoo.com -f -l 1472