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Chapter 8 – Point-to-Point Protocol

Command Line Interface and Application Examples for Multi-Tech Systems, Inc. IP Modules (S000368F) 91

Chapter 8 – Point-to-Point Protocol

Introduction

Point-to-Point Protocol (PPP) is the Internet Standard for transmission of IP packets over serial links. This protocol

is commonly used in serial links (asynchronous or synchronous) to transfer packets between two endpoints. These

links provide full-duplex simultaneous bi-directional operation and are assumed to deliver packets in order. It is

intended that PPP provide a common solution for easy connection of a wide variety of hosts, bridges, and routers.

The advantage of PPP is that it allows for inter-operability between endpoints (for example, routers) using PPP for

their serial communication.

• PPP is enabled on the modem port.

• PPP interface is the IP-enabled interface in the IP module.

• All IP-enabled services can be used only after the PPP link is up with an IP Address.

• In the event of a PPP link down, SMTP and POP3 requests can trigger the PPP link establishment and

termination.

Components of PPP

• A method for encapsulating multi-protocol data grams.

• A Link Control Protocol (LCP) for establishing, configuring, and testing the data-link connection. The

LCP is used to automatically agree upon the encapsulation format options, handle varying limits on

sizes of packets, detect a looped-back link and other common configuration errors, and terminate the

link.

• A family of Network Control Protocols (NCPs) for establishing and configuring different network-layer

protocols. In the IP module, IPCP will be negotiated.

Ping Keep-alive

The ping keep alive feature checks the PPP link to determine if it is ACTIVE or NOT. With a few ISP’s when

PPP link goes down, the DCD on the modem interface is not brought down. In such cases, this feature is

instrumental in detecting the Link status and act accordingly.

“Ping Keep Alive” tries to ping to a configured server. If the ping fails, it is assumed that the PPP link is

down.

Note:

Ping Keep Alive never initiates a PPP link.

Wakeup-on-Call

The “Wakeup-on-Call” feature is applicable on the modem port of the product. When this feature is enabled,

the users on the Internet can initiate a “PPP link establishment “.

To implement this feature, follow these steps:

1. The modem port is answering for a call. This could be because of an Idle timeout or the port is

configured for answering mode.

2. On receiving a RING from the outside world, the caller-id is validated against the configured caller-

ids. If the caller-id is valid, then the CALL is withheld and the SocketModem initiates the “PPP

linkup” on the modem port. If the caller-id is invalid, the modem port goes back to answering a call.

Note:

Wakeup-on-call is given higher priority regardless of configured modem-connect states. (Answering,

Idle timeout in case of BOTH).

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