This document is very technical in nature, so background knowledge is required. It is assumed that you are familiar with the TCP/IP network protocol, and in particular, network and node addressing, network address masks, subnetting, routing, and routing protocols, such as RIP. Configuring SLIP services on a dial-up server requires a knowledge of these concepts, and if you are not familiar with them, please read a copy of either Craig Hunt's TCP/IP Network Administration published by O'Reilly & Associates, Inc. (ISBN Number 0-937175-82-X), or Douglas Comer's books on the TCP/IP protocol.
It's further assumed that you have already setup your modem(s) and
configured the appropriate system files to allow logins through your
modems. If you haven't prepared your system for this yet, please see
the tutorial for configuring dialup services; if you have a World-Wide
Web browser available, browse the list of tutorials at
http://www.freebsd.org/; otherwise, check the place
where you found this document for a document named dialup.txt or
something similar. You may also want to check the manual pages for
sio(4) for information on the serial port device driver and
ttys(5), gettytab(5), getty(8), & init(8) for
information relevant to configuring the system to accept logins on
modems, and perhaps stty(1) for information on setting serial
port parameters [such as clocal for directly-connected
serial interfaces].