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ICMP: Difference between revisions
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(Created page with " == Summary == ICMP is a [https://en.wikipedia.org/wiki/Network_layer L3 protocol], and forms part of the [https://en.wikipedia.org/wiki/Internet_protocol_suite IP suite]. It differs from other protocol in the suite as it is not used by applications to exchange data. Rather, ICMP messages are used for error reporting, and to obtain diagnostic information, enabling network administrators to attend to issues in the network. ICMP was introduced in 1981 to fulfil this role,...") |
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== Summary == | == Summary == | ||
ICMP is a [https://en.wikipedia.org/wiki/Network_layer L3 protocol], and forms part of the [https://en.wikipedia.org/wiki/Internet_protocol_suite IP suite]. It differs from other protocol in the suite as it is not used by applications to exchange data. Rather, ICMP messages are used for error reporting, and to obtain diagnostic information, enabling network administrators to attend to issues in the network. ICMP was introduced in 1981 to fulfil this role, as this capability was missing from the internet protocol itself. Like L4 protocols, ICMP works by having its data encapsulated in IP packets. Nonetheless, it is still considered (and processed) like a | ICMP is a [https://en.wikipedia.org/wiki/Network_layer L3 protocol], and forms part of the [https://en.wikipedia.org/wiki/Internet_protocol_suite IP suite]. It differs from other protocol in the suite as it is not used by applications to exchange data. Rather, ICMP messages are used for error reporting, and to obtain diagnostic information, enabling network administrators to attend to issues in the network. ICMP was introduced in 1981 to fulfil this role, as this capability was missing from the internet protocol itself. Like L4 protocols, ICMP works by having its data encapsulated in IP packets. Nonetheless, it is still considered (and processed) like a L3 protocol, due to its function pertaining exclusively to the behaviour of that layer, and the fact that it is not used for data transmission. | ||
An ICMP packet consists of two parts: | An ICMP packet consists of two parts: | ||