A movie where you can see the flow of ICMP with a LAN cable where the flow of packets appears to shine



Using the LAN cable '

Illumination packet ' that makes it look as if a packet shining in the cable is flowing according to the type and direction of the communication packet, the flow of Internet Control Notification Protocol (ICMP) which is one of the protocols The movie that you can watch has been published by aso .

Let's watch [ICMP] with the LAN cable that packets shine! -YouTube




LAN unnie at the bottom right of the screen explains the movie.



ICMP belongs to the third layer, the network layer, of the

OSI reference model that divides the communication function into a hierarchical structure, and is a protocol used for sending control messages on the Internet. Illumination packet light color and correspondence of each protocol are as follows, and ICMP is pink.



The ICMP protocol is also used by the

ping command at the command prompt. The ping command sends an ICMP message to the destination IP address.



For example, if a response is returned from the Google Public DNS IP address '

8.8.8.8 ', it means that the terminal is connected to the Internet. In the movie, you can see that the pink light makes a round trip once a second between 'PC1' and 'router'.



When the Internet is not connected, the ICMP message from PC1 to the router remains one way. There is no response when the pink light is sent to the router.



When you use the ping command to the IP address of PC2 through the router, ICMP messages are also communicated every 1 second.



Note that if you specify an IP address that does not exist in the ping command, no ICMP message is sent, and you can see that the

Address Resolution Protocol (ARP) message continues to search for an IP address that does not exist.



You can also check the flow of ICMP messages with the

traceroute command, which can check the route to the destination IP address.



The traceroute command can check ICMP

Time Exceeded Message .



At the time of writing the article, it was only a commentary movie of ICMP, but it seems that a movie to see the flow of

TCP / UDP will be released in the future.

Related Posts:

in Software,   Video, Posted by darkhorse_log