Part of the process of setting up a dial-in server involves configuring information about each known remote caller.
Obtained the UNIX user names for all users who are permitted to log in from remote dial-out machines.
Set up the modem and serial line, as described in How to Configure the Modem and Serial Port (Dial-in Server).
Dedicated an IP address to be assigned to incoming calls from remote users. Consider creating a dedicated incoming IP address if the number of potential callers exceeds the number of modems and serial ports on the dial-in server. For complete information about creating dedicated IP addresses, go to Creating an IP Addressing Scheme for Callers.