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This article is to share with you about the usefulness of icmp. The editor thought it was very practical, so I shared it with you as a reference. Let's follow the editor and have a look.

Icmp is the Internet control message protocol. It is a subprotocol of the TCP/IP protocol suite, which is used to transmit control messages between IP hosts and routers. The control message refers to the message of the network itself, such as whether the network is unreachable, whether the host is reachable, whether the route is available, and so on.

ICMP (Internet Control Message Protocol) Internet Control message Protocol. It is a subprotocol of the TCP/IP protocol suite, which is used to transmit control messages between IP hosts and routers. The control message refers to the message of the network itself, such as whether the network is unreachable, whether the host is reachable, whether the route is available, and so on. Although these control messages do not transmit user data, they play an important role in the transmission of user data.

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ICMP uses the basic support of IP as if it were a higher-level protocol, but ICMP is actually a part of IP and must be implemented by each IP module.

Application:

ICMP protocol is used in many network management commands. Here we take ping and tracert commands as examples to introduce the application of ICMP protocol in detail.

(1) ping command uses ICMP to echo request and reply messages

The packet inter-network probe command ping used in network reachability testing can generate ICMP echo request and reply messages. The destination host sends back the reply message immediately after receiving the ICMP echo request message. If the source host receives the ICMP echo reply message, it means that the network arriving at the host is normal.

(2) routing Analysis Diagnostics tracert uses ICMP time exceeded messages

The tracert command is mainly used to display the path that the packet takes to reach the destination host. Returns the path details of the packet's arrival at the destination host by executing a tracert to the other host command, and displays the time elapsed by each path.

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