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This article is about the usefulness of the icmp protocol. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Icmp is an Internet control message protocol, which is a connectionless protocol for transmitting error report control information. It belongs to the network layer protocol and is mainly used to transmit control information between the host and the router, including error reporting, exchange of restricted control and status information.

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.

ICMP protocol is a connectionless protocol that is used to transmit error reporting control information. It is a very important protocol, and it is of great significance for network security. It belongs to the network layer protocol and is mainly used to transmit control information between the host and the router, including error reporting, exchange of restricted control and status information, etc. When the IP data cannot reach the destination, or the IP router cannot forward the packet at the current transmission rate, the ICMP message is automatically sent.

ICMP is an important member of the network layer in the TCP/IP model, and together with IP protocol, ARP protocol, RARP protocol and IGMP protocol constitute the network layer of the TCP/IP model. Ping and tracert are two commonly used network management commands, ping is used to test network reachability, and tracert is used to display the path to the destination host. Both ping and tracert use ICMP protocol to achieve network functions, and they are typical examples of applying network protocols to daily network management.

From a technical point of view, ICMP is an "error detection and return mechanism". Its purpose is to enable us to detect the connection status of the network and ensure the accuracy of the connection. When a router has an accident while processing a packet, it can report the event to the source side of the packet through ICMP.

Its main functions are: detecting the existence of remote host, establishing and maintaining routing data, redirecting data transmission path (ICMP redirection), and data flow control. ICMP in communication, mainly through different categories (Type) and code (Code) to let the machine to identify different connection conditions.

ICMP is a very useful protocol, especially when we have to judge the state of the network connection.

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