Network Monitoring Software - Network Status - PingCOPA

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This PingCOPA network monitoring software window executes a the DOS command line instruction:


netstat -e -s -p


and displays the results. Clicking on the refresh button will update the display.




Various information will be returned about the network activity of the machine on which the PingCOPA network monitoring software is running.


Here are details of some of the results:


Unicast Packets - the most common type, which use TCP/IP. They are from one source machine (usually an internet server) to another destination machine (your machine), and are used for such protocols as HTTP, SMTP, POP3, FTP


Multicast Packets - sent from one source machine to more than one destination machine. Used for example by a video server sending out networked TV channels to a number of destinations. This saves considerable internet capacity over unicast as many people can be watching the same material. A single packet can be sent over a considerable part of the route, before being split into several packets which then make their way to their individual destinations.


Discards - packets not fully processed, perhaps because they exceed the Maximun Transmission Unit size for the network, or were damaged in transit.


TCP Statistics - Transmission Control Protocol is used when a connection is established between two machines, eg a browser and a web server. Various error checking is in place so that if packets arrive damaged, or not at all, a request is sent to re-send them. Also packets may take different routes and arrive out of order, necessitating re-ordering. Thus ultimately the browser will receive exactly the information sent by the server.


UDP Statistics - User Datagram Protocol is a "throwaway" protocol, used for such things as Time Server and Domain Name Server lookups. They do not require the "overhead" involved in setting up and maintaining a TCP connection, and are better for servers which may ignore them if too busy. Typically  arequest is sent using UDP, but no connection is set up, nor any response necessarily expected. If the distant machine does not respond then further requests are sent out, sometimes to alternative machines. Low-quality audio streams sometimes use UDP as the omission of small amounts of information does not make the audio received unintelligible.