HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 78

Configuring IP performance optimization

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Configuring IP performance optimization Enabling receiving and forwarding of directed broadcasts to a directly connected network Directed broadcast packets are broadcast on a specific network. In the destination IP address of a directed broadcast, the network ID identifies the target network, and the host ID is made up of all ones. If a device is allowed to forward directed broadcasts to a directly connected network, hackers may mount attacks to the network. However, you can enable the feature by using the UDP Helper function to convert broadcasts to unicasts and forward them to a specified server. Enabling receiving of directed broadcasts to a directly connected network If the switch is enabled to receive directed broadcasts, the switch determines whether to forward them according to the configuration on the outgoing interface. To enable the device to receive directed broadcasts: Step 1. Enter system view. 2. Enable the device to receive directed broadcasts. Command system-view ip forward-broadcast Remarks N/A Disabled by default Enabling forwarding of directed broadcasts to a directly connected network Follow these guidelines when you enable the device to forward directed broadcasts: • If an ACL is referenced in the ip forward-broadcast command, only packets permitted by the ACL can be forwarded. • If you repeatedly execute the ip forward-broadcast command on an interface, only the last command takes effect. If the command executed last does not include acl acl-number, the ACL configured previously is removed. To enable the device to forward directed broadcasts: Step 1. Enter system view. 2. Enter interface view. 3. Enable the interface to forward directed broadcasts. Command system-view interface interface-type interface-number ip forward-broadcast [ acl acl-number ] Remarks N/A N/A Disabled by default 70

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70
Configuring IP performance optimization
Enabling receiving and forwarding of directed
broadcasts to a directly connected network
Directed broadcast packets are broadcast on a specific network. In the destination IP address of a
directed broadcast, the network ID identifies the target network, and the host ID is made up of all ones.
If a device is allowed to forward directed broadcasts to a directly connected network, hackers may
mount attacks to the network. However, you can enable the feature by using the UDP Helper function to
convert broadcasts to unicasts and forward them to a specified server.
Enabling receiving of directed broadcasts to a directly
connected network
If the switch is enabled to receive directed broadcasts, the switch determines whether to forward them
according to the configuration on the outgoing interface.
To enable the device to receive directed broadcasts:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enable the device to receive
directed broadcasts.
ip forward-broadcast
Disabled by default
Enabling forwarding of directed broadcasts to a directly
connected network
Follow these guidelines when you enable the device to forward directed broadcasts:
•
If an ACL is referenced in the
ip forward-broadcast
command, only packets permitted by the ACL
can be forwarded.
•
If you repeatedly execute the
ip forward-broadcast
command on an interface, only the last
command takes effect. If the command executed last does not include
acl
acl-number
, the ACL
configured previously is removed.
To enable the device to forward directed broadcasts:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view.
interface
interface-type interface-number
N/A
3.
Enable the interface to forward
directed broadcasts.
ip forward-broadcast
[
acl
acl-number
]
Disabled by default