D-Link DIR-859 User Manual page 89

Section 6 - Troubleshooting
4. Can I connect the DIR-859 to an existing router?
We recommend that you replace your existing router with the DIR-859 instead of using both. If your modem is a combo router,
you may want to contact your ISP or review the manufacturer's user guide so you can put the combo router into Bridge mode,
which will turn off the device's NAT functions.
5. Why can't I connect to certain sites or send and receive e-mails when connecting through my router?
If you are having a problem sending or receiving e-mail, or connecting to secure sites such as eBay and banking sites, we
suggest lowering the MTU in increments of ten (e.g., 1492, 1482, 1472, etc).
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® 8, 7, and Vista® 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
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