Operation Manual – IP Addressing and Performance
H3C S3610&S5510 Series Ethernet Switches
Chapter 2 IP Performance Configuration
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Chapter 2 IP Performance Configuration
When configuring IP performance, go to these sections for information you are
interested in:
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Enabling Reception and Forwarding of Directed Broadcasts to a Directly
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Configuring ICMP to Send Error Packets
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Displaying and Maintaining IP Performance
2.1 IP Performance Overview
In some network environments, you need to adjust the IP parameters to achieve best
network performance. IP performance configuration includes:
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Enabling the device to receive and forward directed broadcasts
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Configuring the maximum TCP segment size (MSS) of the interface
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Enabling the SYN Cookie feature and protection against Naptha attack
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Configuring TCP timers
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Configuring the TCP buffer size
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Enabling ICMP error packets sending
2.2 Enabling Reception and Forwarding of Directed
Broadcasts to a Directly Connected Network
Directed broadcasts refer to broadcast packets sent to a specific network. In the
destination IP address of a directed broadcast, the network ID is a network-specific
number and the host ID is all ones. Enabling the device to receive and forward directed
broadcasts to a directly connected network will give hackers an opportunity to attack
the network. Therefore, the device is disabled from receiving and forwarding directed
broadcasts by default. You should however enable the feature when:
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Using the UDP Helper function to convert broadcasts to unicasts and forward
them to a specified server.
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Using the Wake on LAN function to forward directed broadcasts to a PC on the
remote network.
