3Com Switch 7750 SeriesCommand Reference Guide – UDP Helper Chapter 1 UDP-Helper Configuration Commands1-4DescriptionUse the udp-helper port command to specify a UDP-Helper destination port.Use the undo udp-helper port command to disable a port from being a UDP-Helperdestination port.With UDP-Helper enabled, UDP broadcast packets with their destination port being thesix default UDP ports (that is, port 69, 53, 37, 137, 138, and 49) are forwarded to theconfigured destination servers by default. After the UDP-Helper function is disabled, allthe configured UDP-Helper destination ports are cancelled, including the default UDPports.Note that before configuring udp-helper port, you must enable UDP-Helper.Example# Configure the DNS UDP port as a UDP-Helper destination port.<3Com> system-viewSystem View: return to User View with Ctrl+Z.[3Com] udp-helper port dns1.1.5 udp-helper serverSyntaxudp-helper server ip-addressundo udp-helper server [ ip-address ]ViewVLAN interface viewParameterip-address: IP address of the device to be configured as a destination server, in dotteddecimal notation.DescriptionUse the udp-helper server command to specify a destination server for the UDPbroadcast packets to be forwarded.Use the undo udp-helper server command to remove a configured destination server.No destination server is configured by default.Currently, you can configure up to 20 destination servers on a VLAN interface.Note that if you do not provide the ip-address argument when executing the undoudp-helper server command, all the destination servers configured on the VLANinterface are removed.
