How to configure DHCP broadcast packets with unicast frag?

Zyxel_Cooldia

Scenario

My Internet Service Provider router does not accept DHCP broadcast packets with broadcast frag, so that USG is unable to get IP from ISP router. How to set up DHCP broadcast packets with unicast frag?

Answer

The CLI as below, it can change the DHCP broadcast packets frag from broadcast to unicast.
Router(config) # interface wan1
Router(config-if-wan1) # ip address dhcp unicast.
Router(config-if-wan1) # exit