Brocade Network OS Command Reference v4.1.0 - Manual (Page 391)

Network OS Command Reference 353
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ip icmp rate-limit
2
ip icmp rate-limit
Limits the rate at which Internet Control Message Protool (ICMP) messages are sent on an IPv4
network.
Synopsis ip icmp rate-limit milliseconds
no ip icmp rate-limit
Operand milliseconds Number of milliseconds between packets. The range is from 1 through
4294967295.
Defaults The default value is 1000 milliseconds.
Command Modes Interface configuration mode
Description This command limits the rate at which ICMP messages are sent on an IPv4 network. To protect
against TCP SYN attacks, you can configure the Brocade device to drop TCP SYN packets when
excessive numbers of messages are encountered. You can set threshold values for TCP SYN
packets that are targeted at the router itself or passing through an interface, and drop them when
the thresholds are exceeded.
Usage Guidelines The configuration is persistent across a switch reload. Once it is enabled, all outbound ICMP
message types are rate limited.
Examples None
See Also None