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Optimizing IP performance
IP performance optimization tasks at a glance
All IP performance optimization tasks are optional.
1. Configuring features for IP packets
{ Enabling an interface to forward directed broadcasts destined for the directly connected
network
{ Setting the MTU of IPv4 packets sent over an interface
2. Configuring features for ICMP messages
{ Enabling sending ICMP error messages
{ Configuring rate limit for ICMP error messages
{ Disabling forwarding ICMP fragments
{ Specifying the source address for ICMP packets
3. Configuring features for TCP packets
{ Setting TCP MSS for an interface
{ Configuring TCP path MTU discovery
{ Enabling SYN Cookie
{ Setting the TCP buffer size
{ Setting TCP timers
Enabling an interface to forward directed
broadcasts destined for the directly connected
network
About forwarding 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 send such directed broadcast packets to support the following features:
• UDP helper—Converts the directed broadcasts to unicasts and forwards them to a specific
server.
• Wake on LAN—Sends the directed broadcasts to wake up the hosts on the target network.
You can configure this function to enable the interface to forward directed broadcast packets that are
destined for directly connected network.
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