3Com Switch 8800 Family Configuration Guide

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UDP HELPER CONFIGURATION
Overview UDP Helper functions as a relay that converts UDP broadcast packets into unicast
packets and forwards them to a specified server.
With the UDP Helper function enabled, the device decides whether to forward a
received UDP broadcast packet according to the UDP port number of the packet. If
the packet needs to be forwarded, the device modifies the destination IP address
in the IP header and then sends the packet to the specified destination server.
Otherwise, the device sends the packet to its upper layer module.
Configuring UDP
Helper
UDP helper configuration includes:
■ Enabling/disabling the function of forwarding UDP broadcast packets
■ Specifying the UDP ports whose packets need to be forwarded
■ Configuring the destination server to which the UDP packets are forwarded
Configuration
Prerequisites
The router to be configured is reachable.
Configuration Procedure
Tab le 674 Configure UDP helper
Operation Command Description
Enter system view system-view -
Enable the function of
forwarding UDP broadcast
packets
udp-helper enable
Required
■ By default, the functioin is
disabled.
■ When the function is
enabled, the function is
enabled on the six default
ports (69, 53, 37, 137,
138, and 49)
simultaneously.
■ When the function is
disabled, the function is
disabled on all the ports,
including the default ports.