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Activating ICMP Control Messages
ICMP messages are identified by a type and a code. This number pair specifies an ICMP message. For
example, ICMP type 4, code 0, specifies the source quench ICMP message.
To enable or disable an ICMP message, use the
ple, to enable the source quench the ICMP message (type 4, code 0) enter the following:
-> icmp type 4 code 0 enable
To list the ICMP message information use the show icmp control command.
In addition to the
icmp type
commands for convenience. These commands are listed below with the ICMP message name, type, and
code:
ICMP Message
Network unreachable (type 0, code 3)
Host unreachable (type 3, code 1)
Protocol unreachable (type 3, code 2)
Port unreachable (type 3, code 3)
Echo reply (type 0, code 0)
Echo request (type 8, code 0)
Timestamp request (type 13, code 0)
Timestamp reply (type 14, code 0)
Address Mask request (type 17, code 0)
Address Mask reply (type 18, code 0)
These commands are entered as the
echo, timestamp, and address mask commands have options for distinguishing between a request or a
reply, and the unreachable command has options distinguishing between a network, host, protocol, or port.
For example, to enable an echo request message, enter the following:
-> icmp echo request enable
To enable a network unreachable message, enter the following:
-> icmp unreachable net-unreachable enable
Note. Enabling host-unreachable and net-unreachable messages are not recommended as it can cause
the switch instability due to high-CPU conditions depending upon the volume of traffic required by these
messages.
See
Chapter 10, "IP Commands,"
Enabling All ICMP Types
To enable all ICMP message types, use the
For example:
page 1130
icmp type
command, several commonly used ICMP messages have been separate CLI
Command
icmp unreachable
icmp unreachable
icmp unreachable
icmp unreachable
icmp echo
icmp echo
icmp timestamp
icmp timestamp
icmp addr-mask
icmp addr-mask
icmp type
command, only without specifying a type or code. The
for specifics on the ICMP message commands.
icmp messages
OmniSwitch AOS Release 7 Network Configuration Guide
command with the type and code. For exam-
command with the enable keyword.
March 2011
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