System information
3.1.4. DHCP Server
You need to configure a new IP address pool for the clients that connect to the L3 Tunnel
network (the FTP/Audio/Video server and the wireless clients that connect to the L3 Tunnel
SSID). The DHCP server should already be enabled from Scenario 2.
1. From the LAN menu, click Administration Æ DHCP Server Æ Global Configuration
2. In the Admin Mode field, select Enable, then click Submit to enable the DHCP server..
3. Select Pool Configuration in the Navigation tree.
4. For the new address pool, select create and specify the following settings:
Pool Name
Tunnel
Type of Binding
Dynamic
Network Number
192.168.250.0
Network Mask
255.255.255.0
Days
1 day
Hours
0
Minutes
0
Default Router Address
192.168.250.254
5. Click Submit to create the address pool.
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 Unified 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 unified 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.