Serial line communications

SCO TCP/IP offers two protocols that allow you to route data over serial lines:

• PPP -- the Point-to-Point Protocol

• SLIP -- the Serial Line Internet Protocol

Each protocol supports the following:

• multiple simultaneous links (64 for PPP and SLIP)

• communications initiated from either the local or remote host

• dynamic acquisition of serial lines, allowing for lines to be shared with programs such as uucp

• dynamic link configuration, negating the need for kernel relinks

• packet filtering based on packet type

• gateway services

• asynchronous communications

Authentication

Authentication of connection requests with CHAP (Challenge-Handshake Authentication Protocol) or PAP (Password Authentication Protocol), which provides additional security.

Debugging

Multiple levels of debugging data, which appear on the console and in the system logfile.

Error detection

Error detection through the use of a checksum program.

Negotiation

Connect-time negotiation of IP addresses, authentication methods, compression, and other configurable parameters.

Packet priority handling

Two-level packet handling, where telnet, rlogin, and ftp packets have a higher priority than all other packets.

Protocol support

Support for multiple protocols. SLIP only supports the IP protocol.

SCO Global Access

Support for the SCO Global Access browswer and other products (such as other World Wide Web browsers) that make use of an httpd server.

SNMP MIB support

Support for SNMP queries for objects in the PPP Link Control Protocol MIB and the PPP Network Control Protocol MIB.

Configuring serial lines

To configure serial lines:

1. Install and configure TCP/IP with the Network Configuration Manager.

2. Configure SLIP or PPP links with the Network Configuration Manager.

Administering serial lines

Serial line administration consists of:

• Adding or deleting links with the Network Configuration Manager.

• Troubleshooting SLIP or PPP.

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