SonicWALL TZ 190 Manuale Utente

Chapter 24: 

The IP Helper allows the SonicWALL security appliance to forward DHCP requests originating 
from the interfaces on a SonicWALL security appliance to a centralized DHCP server on the 
behalf of the requesting client. IP Helper is used extensively in routed VLAN environments 
where a DHCP server is not available for each interface, or where the layer 3 routing 
mechanism is not capable of acting as a DHCP server itself. The IP Helper also allows NetBIOS 
broadcasts to be forwarded with DHCP client requests. For more information on IP Helper, refer 
to the IP Helper technote at:

 

Enable IP Helper - enables IP Helper features.

Enable DHCP Support - enables DHCP forwarding from the SonicWALL security 
appliance to your central DHCP server. If the DHCP server has been enabled, the message 
“DHCP Server has been enabled. To edit this setting, click here.” is displayed. Clicking 
the link displays the Network > DHCP Server page.

The SonicWALL DHCP Server feature must be disabled before you can enable DHCP 
Support on the IP Helper. The Enable DHCP Support checkbox is greyed out until the 
DHCP Server setting is disabled.