Dell M6220 User Configuration Manual page 947

Figure 34-11. Add Helper IP Address
3. Select the interface to use for the relay.
4. Select a UDP Destination port name from the menu or enter the UDP
Destination Port ID. Select the Default Set to configure for the relay entry
for the default set of protocols.
NOTE:
UDP Broadcast packets for the following services: IEN-116 Name Service
(port 42), DNS (port 53), NetBIOS Name Server (port 137), NetBIOS Datagram
Server (port 138), TACACS Server (Port 49), and Time Service (port 37).
5. Choose whether to discard (True) or keep (False) packets arriving on the
given interface with the given destination UDP port.
6. Enter the IP address of the server to which the packets with the given UDP
Destination Port will be relayed.
7. Click Apply.
The UDP/Helper Relay is added to the interface and the device is updated.
If the DefaultSet option is specified, the device by default forwards
Configuring L2 and L3 Relay Features
947