9.3 Configuring UDP Helper
This section describes how to configure UDP helper to relay broadcast packets with a specified
UDP port.
9.3.1 Establishing the Configuration Task
Before configuring UDP helper, familiarize yourself with the applicable environment, complete
the pre-configuration tasks, and obtain the data required for the configuration. This will help
you complete the configuration task quickly and accurately.
Applicable Environment
A host on an intranet needs to obtain the configuration from a server by sending broadcast packets
such as UDP broadcast packets. If the host and the server are located in different broadcast
domains, broadcast packets cannot reach the server and the host cannot obtain the configuration
from the server.
The AR150/200 provides the UDP Helper function to solve this problem. It can relay broadcast
packets with specified UDP ports by converting broadcast packets into unicast packets and
sending the unicast packets to the specified destination server.
Pre-configuration Tasks
Before configuring UDP helper, complete the following task:
l Configuring a reachable route from the AR150/200 to the destination server
Data Preparation
To configure UDP helper, you need the following data.
No.
Data
1 (Optional) UDP ports of packets need to be
relayed
2 Interface that relays packets of UDP ports and
IP address of the destination server
9.3.2 Enabling UDP Helper
This section describes how to enable UDP helper.
Context
After UDP helper is enabled, the Router checks the destination UDP port of a received broadcast
packet and determines whether to relay the packet:
l If the packet destination UDP port number is the same as the specified UDP port number
and the destination MAC address is a broadcast MAC address, the Router changes the
Huawei AR150&200 Series Enterprise Routers
Configuration Guide - IP Service 9 UDP Helper Configuration
Issue 02 (2012-03-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
204
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