How to Add CHAP Support to the PPP Configuration Files (Dial-in Server)

1. Log in to the dial-in server as superuser.

2. Modify the /etc/ppp/options file.

   Add the options that are shown in bold for CHAP support.

   # vi /etc/ppp/options lock nodefaultroute name CallServe auth require-chap

   name CallServe	Defines CallServe as the CHAP name of the user on the local machine (dial-in server)
   auth	Makes the local machine authenticate callers before establishing the link
   require-chap	Requires peers to provide CHAP credentials before the link can be established

3. Create the remaining PPP configuration files to support the trusted callers.

   See "How to Configure Users of the Dial-in Server" and "How to Define Communications Over the Serial Line (Dial-in Server)".

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