Zhone zNID-GPON-2402 Configuration Manual page 207

4
Enable NAT on the uplink port
Enable the NAT function, and set the DNS addresses. In this case we are
using static addresses.
5
Enable DHCP and specify the range of addresses
Note the every port has its own DHCP server. Each port must be
configured and must be on a separate subnet.
6
Verify the configuration
zNID 24xx Series Configuration Guide
VLANS
207