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D-Link EBR-2310 User Manual
Section 5 - Troubleshooting
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). 
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 (192.168.0.1) and click 
OK
. 
• Enter your username (admin) and password (blank by default). Click 
OK
to enter the web configuration 
page for the device. 
• Click on the
Home
tab and click the 
WAN
button. 
• To change the MTU enter the number in the MTU field and click the 
Apply
button to save your settings. 
• Test your email. If changing the MTU does not resolve the problem, continue changing the MTU in 
increments of ten.