PPP versus SLIP

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PPP versus SLIP

When clients connect to a server by using a modem, they must do so through something other than the frames that normally traverse a network (such as IEEE802.3 discussed in Chapter 3). Some other transport method is needed. In the case of dial-up servers (or terminal servers), two line protocols are popular. Serial Line Internet Protocol, or SLIP, is used frequently in Unix implementations. SLIP is the older of the two line protocols and is geared directly for TCP/IP communications. Windows NT can use the services of a SLIP server. However, it does not provide a SLIP server. Microsoft’s RAS server uses Point to Point Protocol (PPP) because SLIP requires a static IP address and does not provide facility for secured logon (passwords are sent as clear text).

PPP was developed as a replacement for SLIP and provides several different advantages over the earlier protocol. PPP can automatically provide the client computer with an IP address and other configurations. It provides a secure logon and has the capability to transport protocols other than TCP/IP (such as AppleTalk, IPX, and NetBEUI.)

PPP has two important extensions: Multilink Protocol (MP) and Point to Point Tunneling Protocol (PPTP). Windows NT supports both of these extensions to the original PPP.

Multilink Protocol enables a client station to use more than one physical connection to connect to a remote server. This capability provides better throughput over standard modems. You will, however, need multiple phone lines and modems to enable this protocol. This setup can be an easy interim solution if you need to temporarily connect to offices and don’t have the time or budget to set up a leased line or other similar connection.

Point to Point Tunneling Protocol facilitates secure connections across the Internet. By using PPTP, users can connect to any Internet Service Provider (ISP) and can use the ISP’s network as a gateway to connect to the office network. During the session initialization, the client and server negotiate a 40-bit session key. This key can be used to encrypt all packets that will be sent back and forth over the Internet. The packets are encapsulated into PPP packets as the data.

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