Introduction - If you have any usage issues, please Google them yourself
Ppp protocol introduced the main contents of the user access to Internet, in the transmission of data, we need to have a data link layer protocol, which is the most widely Serial Line Internet Protocol (SLIP) and Point to Point Protocol (PPP). Because SLIP only supports IP, such as with the shortcomings, mainly for low-speed (no more than 19.2kbit/s) of the interactive business, it did not become the Internet standard protocol. In order to improve the SLIP, people developed a point-to-point PPP (Point-to-Point Protocol). RFC1661, RFC1662, RFC1663.