While many ICMP messages are designed to be sent as error messages in response to packets of other protocols, some are designed to implement standalone functionality. For example, a type 3 ICMP message with a 0 code points to issues with the destination network, while a 1 code means that the issue is that the particular host is unreachable. For example, a type value of 3 means that the intended destination is unreachable.įor some types, there are multiple code values intended to provide additional information. Error data in ICMP is carried in two values: the type and the code.Īs shown above, the type of an ICMP packet contains the overall message that the message is intended to convey.
ICMP in WiresharkĪs an error messaging protocol, the structure of an ICMP packet is designed to provide the necessary information to the recipient. As a result, an organization’s ICMP traffic should largely be confined inside the network boundary, but it is a common protocol to see in network traffic captures.
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