Telnet is a client-serveur protocol based on TCP; the client usually they are connected to door 23 on the serveur (in spite of the door can be different, like for several Internet protocols). In part because of the planning of the protocol and in part for the flexibility typically supplied from programs telnet, is possible to use a program telnet in order to establish one interactive logon to some other service on a serveur Internet. I use classic is to be connected with the telnet to door 25 (on which typically a serveur smtp is found ) in order to carry out the debugging of a mail serveur.
Protocol telnet can be divided in a main part and a set of extensions. The main part is described from 854 RFC and RFC 855 of the IETF, that also they are joined in STD 8, and defines the characteristics base of the protocol and the way to implement the extensions. Between the many extensions, some have been adopted like Internet Standard. Documents STD from the 27 to the 32 define several extensions of telnet, the greater part di.le which are much diffuse. Between the remaining extensions, the more important are those proposals from the IETF like standard; ulterior details can are find to you in STD 1.
Like explained more ahead, telnet is not sure and would have generally is avoided. Its use on the freenets involves serious risks of emergency.
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