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Optimizing IP performance
A customized configuration can help optimize overall IP performance. This chapter describes various
techniques you can use to customize your installation.
Command and hardware compatibility
Commands and descriptions for centralized devices apply to the following routers:
• MSR1002-4/1003-8S.
• MSR2003.
• MSR2004-24/2004-48.
• MSR3012/3024/3044/3064.
• MSR954(JH296A/JH297A/JH298A/JH299A)
Commands and descriptions for distributed devices apply to MSR4060 and MSR4080 routers.
Enabling an interface to receive and forward
directed broadcasts destined for the directly
connected network
A directed broadcast packet is destined for all hosts on a specific network. In the destination IP
address of the directed broadcast, the network ID identifies the target network, and the host ID is
made up of all ones.
If an interface is allowed to forward directed broadcasts destined for the directly connected network,
hackers can exploit this vulnerability to attack the target network. In some scenarios, however, an
interface must receive and send such directed broadcast packets to support UDP helper and Wake
on LAN.
This task enables an interface to accept directed broadcast packets that are destined for and
received from the directly connected network to support UDP helper. UDP helper converts the
directed broadcasts to unicasts and forwards them to a specific server.
The task also enables the interface to forward directed broadcast packets that are destined for the
directly connected network and are received from another subnet to support Wake on LAN. Wake on
LAN sends the directed broadcasts to wake up the hosts on the target network.
Configuration procedure
To enable an interface to receive and forward directed broadcasts destined to the directly connected
network:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface
interface-type
interface-number
N/A
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