pppd(ADMN)                      19 June 1992                      pppd(ADMN)


 Name

    pppd - Point-to-Point Protocol Daemon

 Syntax

    /etc/pppd

 Description

    The pppd daemon manages the Point-to-Point physical connection between
    the local and remote host.  pppd uses the login-password technique to
    establish PPP connections to remote hosts.  pppd uses the configuration
    files associated with the ``Basic Network Utilities'' (BNU).  The method
    for configuring the serial IP link is similar to that used for uucp(C) or
    cu(C).  The serial lines may be used interchangeably for standard user
    logins, uucp logins, and PPP logins, and the standard uucp lock file
    techniques are used to share these resources.

    pppd opens a control channel to the kernel PPP through /dev/ppcid, and
    waits for incoming PPP connection requests.  pppd is notified of incoming
    PPP connections via shared memory and semaphores.  The PPP user shell,
    ppp(ADMN), sends a PPP service request through shared memory for each
    incoming PPP connection request.  When PPP needs to attach a remote host
    before initiating PPP packet traffic, it will send a request over the
    control channel with the desired IP address.  pppd searches /etc/ppphosts
    (see ppphosts(SFF)) for an entry with a host name corresponding to this
    IP address.  This entry, in conjunction with the /usr/lib/uucp/Systems
    file, is used to dial the modem (if necessary) and perform a login into
    the remote host.

    When the remote login process completes, pppd links the connected tty
    beneath the PPP multiplexing driver and informs PPP that the link is
    established.

 Files

    /dev/ppcid
    /etc/ppphosts
    /usr/lib/uucp/Systems
    /usr/lib/uucp/Devices

 See also

    asyhdlc(ADMP), cu(C), ppp(ADMN), syslog(ADMN), uucp(C), ppphosts(SFF),
    ppp(ADMP)