To find examples of the /etc/ppp/options file, refer to the following:
For a dial-out machine, see How to Define Communications Over the Serial Line.
For a dial-in server, see How to Define Communications Over the Serial Line (Dial-in Server).
For PAP support on a dial-in server, see How to Add PAP Support to the PPP Configuration Files (Dial-in Server).
For PAP support on a dial-out machine, see How to Add PAP Support to the PPP Configuration Files (Dial-out Machine).
For CHAP support on a dial-in server, see How to Add CHAP Support to the PPP Configuration Files (Dial-in Server).