13
IP PERFORMANCE CONFIGURATION
When configuring IP performance, go to these sections for information you are
interested in:
■ “IP Performance Overview” on page 127
■ “Enabling Reception and Forwarding of Directed Broadcasts to a Directly
Connected Network” on page 127
■ “Configuring TCP Attributes” on page 129
■ “Configuring ICMP to Send Error Packets” on page 130
■ “Displaying and Maintaining IP Performance” on page 132
IP Performance
Overview
In some network environments, you need to adjust the IP parameters to achieve
best network performance. IP performance configuration includes:
■ Enabling the device to receive and forward directed broadcasts
■ Configuring the maximum TCP segment size (MSS) of the interface
■ Configuring TCP timers
■ Configuring the TCP buffer size
■ Enabling ICMP error packets sending
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:
■ Using the UDP Helper function to convert broadcasts to unicasts and forward
them to a specified server.
■ Using the Wake on LAN function to forward directed broadcasts to a PC on the
remote network.
Enabling Reception of
Directed Broadcasts to a
Directly Connected
Network
If a device is enabled to receive directed broadcasts, the device will determine
whether to forward them according to the configuration on the outgoing
interface.
Follow these steps to enable the device to receive directed broadcasts:
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