Many User Datagram Protocols (UDP), such as DHCP or DNS, rely on broadcasts or multicasts to find their servers. This usually requires that their servers be present in the same broadcast subnet. To support cases where servers and clients are in different subnets, UDP broadcast forwarding is used. IP Helper is used to assist in the broadcast or multicast of packets across a firewall interface. It also helps to forward the packets to other interfaces based on policy.
To enable IP Helper, select the Enable IP Helper checkbox on the Network > IP Helper page.
Each individual protocol can be enabled or disabled by selecting or deselecting the checkbox in the Enable column for that protocol.
Pausing your cursor over the Traffic Stats icon displays the packet counters for that protocol.
For more information on IP Helper, refer to the IP Helper technote at: https://support.sonicwall.com/kb-product-select.