Samsung CY-SWR1100 User Manual page 106

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 email, or connecting to secure sites such as eBay, banking sites, and Hot-
mail, we suggest lowering the MTU in increments of ten (Ex. 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.
Note: AOL DSL+ users must use MTU of 1400.
• Click Start and then Click Run.
• Windows® 95, 98, and Me users type in command (Windows® NT, 2000, and XP 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 fragment-
ed packet. Take that value and add 28 to account for the various TCP/IP headers. For example, lets say that 1452 was the final
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:
1. Open your browser, enter the IP address of your router (192.168.0.1), and Click then OK.
2. Enter your username (admin) and password (blank by default). Click OK to enter the web configuration page for the
device.
3. Click Setup, and then click Manual Configure.
4. To change the MTU, enter the number in the MTU field, and then click Save Settings to save your settings.
5. Test your email. If changing the MTU does not resolve the problem, continue changing the MTU in increments of ten.
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