It is possible to run from inetd but you must consider
the following:

  You use pptpctrl not pptpd.

  You must put pptpctrl in /etc/services as port 1723.

  You must configure pppd to allocate IP addresses (eg,
  use /etc/options.ttyXX, the pppd erpcd hack and an erpcd,
  or some other modification to pppd).

  libwrap is not used in this mode - you should use tcp
  wrappers in inetd like with any other network service.

  The configuration file is ignored in this mode.

  An example command line is:

     pptpctrl 0 0 0 0 0

  This would be put in inetd.conf as (assuming Linux tcp
  wrappers):

    pptpctrl stream tcp nowait root /usr/sbin/tcpd /usr/local/sbin/pptpctrl 0 0 0 0 0 --buffer--

  Note the --buffer-- is just to make the process name
  longer so it can modify its name to something meaningful.

  First option: debugging (0 for off, 1 for on)
  Second option: PPP options file (0 for off, 1 followed
                 by a file name for on)
  Third option: TTY speed (0 for default, 1 followed
                by a speed to set a speed)
  Fourth option: Local IP address (0 for pppd-determined,
                 1 followed by an address to set)
  Fifth option: Remote IP address (0 for pppd-determined,
                1 followed by an address to set)

  Another example, debugging on, alternate config file,
  setting tty speed and specifying the local IP address:

     pptpctrl 1 1 /etc/ppp/options.PPTP 1 115200 1 192.168.0.1 0

David Luyer, luyer@ucs.uwa.edu.au
Tue Jun 15 16:06:05 WST 1999