3.1.4.1 DHCP on the Customer Network
For this scenario, AP2 resides in the “customer” network. Configure the L3 device in the
customer network to assign the IP address 172.17.6.1 to AP2. You will use this IP
address to add to the L3/IP discovery list.
3.1.5 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
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 0/1 to 1542 bytes.
You will need to repeat the steps for port 0/24. Also, make sure the port on the
“customer” L3 device where AP2 is attached has an MTU size of at least 1542.
1. From the LAN tab, 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.
3. Enter 1542 as the MTU size in the Maximum Frame Size field.
4. Click Submit to apply your changes to the running configuration.
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