D-Link DWR-956M, Руководство пользователя

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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 (192.168.1.1) and click OK .
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Enter your username (admin) and password (blank by default). Click OK to enter the web configuration page for the device.
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Click on Setup and then click Manual Configure .
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To change the MTU, enter the number in the MTU field and click Save Settings to save your settings.
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Test your email. If changing the MTU does not resolve the problem, continue changing the MTU in increments of ten.