24 UDP-Helper Configuration
24.1 UDP-Helper Configuration
24.1.1 UDP-Helper Overview
The main function of UDP-Helper is to implement the relay and forward of UDP broadcast
message. By configuring the destination server requiring forwarding, the UDP broadcast
messages can be converted into unicast messages which are sent to the specified
destination server. This destination server plass the role of a relay.
When the UDP-Helper is enabled, the destination UDP port number of received broadcast
packets will be identified. If this number matches the port number to be forwarded, the
destination IP address of packets will be modified as the IP address of the specified
destination server, and the specified destination server will be sent by means of unicast.
When enabling the UDP-Helper, the broadcast packets of Ports 69, 53, 37, 137, 138 and 49
are relayed and forwarded by default.
The relay of BOOTP/DHCP broadcast message is implemented through
the UDP Port 67 and 68 by the DHCP Relay module; therefore, the two
ports can not be configured as the relay port of UDP-Helper.
24.2 Configuring UDP-Helper
24.2.1 Default Configuration of UDP-Helper
Table 24-1 Default Configuration of UDP-Helper
When enabling the UDP-Helper, the UDP broadcast
packets of Ports 69, 53, 37, 137, 138 and 49 are
relayed and forwarded by default.
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