D-Link DSL-124 User Manual

145D-Link DSL-124 Wireless N300 ADSL2+ Modem Router User Manual
Section 8 - 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 nd your MTU, you can now congure 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 (sometimes blank by default). Click OK to enter the web conguration page for the device.
• Click on Setup and then click Manual Congure.
• To change the MTU, enter the number in the MTU eld and click Save Settings to save your settings.
• Test your email. If changing the MTU does not resolve the problem, continue changing the MTU in increments of ten.

D-Link DSL-124 Specifications

General

Wireless Standard	802.11b/g/n
Frequency Band	2.4GHz
LAN Ports	4 x 10/100Mbps
Security	WPA/WPA2
Antenna	2 x External Antennas
Wired Ports	1 x RJ-11 ADSL port
ADSL Standards	ADSL2/2+