What is SLIP? What are the problems it has?

In this tutorial, we are going to see What is SLIP? What are the problems it has? Most people, do not have a line (cable or ethernet) directly connected to the Internet, and are forced to use telephone lines (the most widespread network) to connect to the Internet. The connection is made through a modem, a device capable of converting digital data from the computer into analog signals (which can travel over the telephone line by amplitude or frequency modulation, just like voice when you use the telephone).

Since only two computers communicate and the speed of a telephone line is low compared to that of a local network, it is necessary to use a protocol that allows standard communication between the different machines using a modem, and that does not overload the telephone line. These protocols are called modem protocols.
 

 

Definition of a point-to-point connection

By the classic telephone line, two computers maximum can communicate by modem together, in the same way as it is not possible to call simultaneously two people by the same telephone line. We say that we have a point-to-point connection, that is to say, a connection between two machines limited to its simplest expression: there is no need to share the line between several machines, each one speaks and answers in its turn.
 

 
Thus, many modem protocols were developed. The first of them allowed simple data transmission between two machines, then some were equipped with error control, and with the rise of the Internet, they were equipped with the ability to address machines. In this way, there are now two major modem protocols:

• SLIP: an older protocol, weak in controls
• PPP: the most used protocol for Internet access by modem, it allows addressing machines

 

 

SLIP protocol:

SLIP stands for Serial Line Internet Protocol. SLIP is the result of integrating the previous modem protocols into the TCP/IP protocol suite.

It is a simple Internet connection protocol that does not perform address checking or error checking, which is why it quickly became obsolete compared to PPP.

The transmission of data with SLIP is very simple: this protocol sends a frame containing only the data to be sent followed by an end character (the END character, whose ASCII code is 192). A SLIP frame, therefore, looks like this:
 

 
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