Motorola PMP320 Configuration Manuallines page 24

Step 6: Configure an IP Pool for Subscriber Module/CPE. This can be done in two ways.
Either enable DHCP server at the PMP320 Access Point or Configure a Static pool.
Step 6.1: First method is to configure a DHCP pool on PMP320 Access Point.
Path to navigate to enable/configure DHCP server on the AP for Wireless interface.
Configuration DHCP Server Properties
"enable" the DHCP server. The lease duration for the IP address can be set here.
Next Select Configuration DHCP Server Dynamic Pools