Current Dhcp Leases - SonicWALL SonicOS Enhanced 2.2 Administrator's Manual

Current DHCP Leases

The current DHCP lease information is displayed in the Current DHCP Leases table. Each binding
displays the IP address and the Ethernet address along with the type of binding, Dynamic, Dynamic
BOOTP, or Static BOOTP. To delete a binding, which frees the IP address on the DHCP server, click the
Trashcan icon next to the entry. To edit an entry, click the Notepad icon next to the entry.
Network > IP Helper
The IP Helper allows the SonicWALL to forward DHCP requests originating from the interfaces on a
SonicWALL 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.
IP Helper Settings
• Enable IP Helper - enables IP Helper features.
• Enable DHCP Support - enables DHCP forwarding from the SonicWALL to your central DHCP serv-
er. 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.
• Enable NetBIOS Support - enables NetBIOS broadcast forwarding with the DHCP requests. NetBI-
OS is required to allow Windows operating systems to browse for resources on a network.
Alert!
The SonicWALL DHCP Server feature must be disabled before you can enable DHCP Support.
IP Helper Policies
IP Helper Policies allow you to forward DHCP and NetBIOS broadcasts from one interface to another
interface.
Page 82 SonicWALL SonicOS Standard Administrator's Guide