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200 © 2001- 2006 D-Link Corporation/D-Link Systems, Inc. All Rights Reserved.
D-Link Unified Access System User Manual
Setting the MTU Size
The MTU determines the maximum size of a packet that can be transmitted through a port in
one frame. The default MTU size for the ports on the D-Link WLAN Controller Switch is
1518 bytes. Packets that use the L3 tunnel have an extra 20 bytes in the header for
encapsulation. To support these larger frames, you can increase the MTU size on all
intermediate ports and WLAN switch ports. The AP can transmit and receive frames of up to
1542 bytes on the LAN port
NOTE: If you use tunneling only for IP telephony, or if you set the MTU size on all
wireless clients that use tunneling to 1480, you do not need to increase the
MTU size in the network.
The following example shows how to change the MTU size on port 12 (interface 1/0/12 in
unit/slot/port format or 0/12 in slot/port format) to 1542 bytes.
1. From the CLI, log on to the switch and enter interface configuration mode for the port to
configure.
(switch-prompt) >enable
Password:********
(switch-prompt) #configure
(switch-prompt) (Config)#interface 1/0/12
2. Use the mtu command to set the desired maximum transmission unit size for the interface.
(switch-prompt) (Interface 0/12)#mtu 1542
3. To save your changes to NVRAM, exit to Privileged EXEC mode and enter write.
Use the following steps to set the MTU size by using the Web interface
1. Log on to the switch and access the Administration > Port Configuration > Port
Configuration page.
2. From the Slot/Port or Unit/Slot/Port field, select the port to configure from the drop-
down list, or select All to configure all ports.