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DES-7200 Configuration Guide Chapter 6 UDP-Helper Configuration
6-1
6 UDP-Helper
Configuration
6.1 UDP-Helper
Configuration
6.1.1 UDP-Helper
Overview
The main function of UDP-Helper is to implement the relay and forward of UDP
broadcast packets. By configuring the destination server for the UDP broadcast
packets to be forwarded, the UDP-Helper can convert the UDP broadcast
packets into the unicast packets and then send them to the specified destination
server. The UDP-Helper acts like a relay.
Once enabled, the UDP-Helper will check to see whether the destination UDP
port number of the received broadcast packets matches the port number to be
forwarded. If so, it modifies the destination IP address of packets as the IP
address of the specified destination server, and send the packets to the
destination server in unicast form.
When the UDP-Helper is enabled, the broadcast messages from Ports 69, 53,
37, 137, 138 and 49 are relayed and forwarded by default.
Note
The relay of BOOTP/DHCP broadcast packet 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.
6.2 Configuring UDP-Helper
6.2.1 Default UDP-Helper
Configuration
Default UDP-Helper configuration
Attribute Default value