Table of Contents
Advertisement
Point-to-Point Protocol
IP/PPP (IPCP) Features
893-826-A
For terminal serving and printer serving, the devices that provide services are
connected to a network and the users of those services usually work at a
location that is geographically local to the device offering the service. Serial
ports at communication servers can also be connected to modems, switches,
and other devices to provide access to services that are available at remote
locations or for users who are at remote locations. This type of connection is
referred to as "access serving."
Access serving configurations include anything from simple dial-in and
dial-out modems for low-speed interactive traffic (such as terminal emulation,
text editing, file transfers, electronic mail) to more sophisticated applications.
The Point-to-Point Protocol (PPP) allows a personal computer (PC), another
communication server, or a router that also supports PPP to gain access to a
network, such as Internet networks (IP) or Novell NetWare networks (IPX),
through a serial port. PPP devices can connect to the communication server
directly over a serial line or through a modem.
PPP provides a standard method for transmitting multiprotocol datagrams over
point-to-point links. Because PPP is a datagram transmission service, it is not a
guaranteed delivery service. (To compensate, flow control methods and the
requirement by higher-level protocols that messages be acknowledged before
additional messages are sent means that most packets are delivered without
error.)
PPP provides an excellent foundation for other applications. PPP defines a Link
Control Protocol (LCP) for establishing, configuring, and testing the data-link
connections. PPP also provides a family of Network Control Protocols (NCP)
for establishing and configuring network layer protocols. The IP Control
Protocols (IPCP) and IPX Control Protocol (IPXCP) are NCPs supported by
the Model 3395A server PPP implementation.
The Model 3395A server implementation of IPCP supports two general
network configurations: the single-node configuration and the network
configuration. In the single-node configuration, a PC running PPP is attached to
a communication server port over a serial line. In the network configuration,
two communication servers route IP traffic between two LANs with different
subnet addresses in the Internet.
Point-to-Point Protocol
1-3
Advertisement
Table of Contents
