ip helper-address address
no ip helper-address address
address Destination broadcast or host address to be used when forwarding UDP broadcasts. There can be more than one helper address per interface.
To have the Cisco IOS software forward User Datagram Protocol (UDP) broadcasts, including BOOTP, received on an interface, use the ip helper-address interface configuration command. To disable the forwarding of broadcast packets to specific addresses, use the no form of this command.
Router(config-if)#ip helper-address 18.104.22.168
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