D-Link DIR-615 User Manual page 108

Section 6 - Troubleshooting
You should start at 1472 and work your way down by 10 each tme. Once you get a reply, go up by 2 untl you get a fragmented packet. Take that
value and add 28 to the value to account for the varous TCP/IP headers. For example, lets say that 1452 was the proper value, the actual MTU sze
would be 1480, whch s the optmum for the network we're workng wth (1452+28=1480).
Once you find your MTU, you can now configure your router wth the proper MTU sze.
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 clck OK.
• Enter your username (admn) and password (blank by default). Clck OK to enter the web configuraton page for the devce.
• Clck on Setup and then clck Manual.Configure.
• To change the MTU enter the number n the MTU field and clck Save.Settings to save your settngs.
• Test your e-mal. If changng the MTU does not resolve the problem, contnue changng the MTU n ncrements of ten.
D-Lnk DIR-615 User Manual 104