Solution pour routeur industriel avec fausse connexion, détection de lien ICMP

Solution for Industrial router with False connection, you can use ICMP link detection

example:

Detect IP address www.qq.com

Detect IP address:(Optional)

Interval: 120 seconds

Retry: 8 times

Abnormal handling: restart the system

ICMP (Internet Control Message Protocol). It is a sub protocol of the TCP/IP protocol cluster used to transmit control messages between IP hosts and routers. Control messages refer to messages from the network itself, such as network connectivity, host accessibility, and routing availability. These control messages, although not transmitting user data, play an important role in the transmission of user data.

ICMP uses basic support for IP, just like it is a higher-level protocol, but in reality, ICMP is a component of IP and must be implemented by each IP module.

application

The ICMP protocol is applied in many network management commands. Taking ping and tracert commands as examples, this article provides a detailed introduction to the application of the ICMP protocol.

(1) The ping command uses ICMP to send back request and response messages

The packet inter network detection command ping used in network accessibility testing can generate ICMP echo request and response messages. After receiving the ICMP echo request message, the destination host immediately sends a reply message. If the source host can receive the ICMP echo reply message, it indicates that the network reaching the host is normal.

(2) The routing analysis diagnostic program tracert used ICMP time exceeding the packet

The tracert command is mainly used to display the path that a packet has passed through to reach the destination host. By executing a tracert command to the other host, return detailed information on the path taken by the packet to reach the destination host, and display the time consumed by each path.