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NAME
     ppp, ppp_diag, ipd, ipdptp,  ipdcm  -  STREAMS  modules  and
     drivers for the Point-to-Point Protocol

DESCRIPTION
     ppp is a STREAMS module which implements the  Point to Point
     Protocol  ("PPP").    PPP  is a datalink protocol which pro-
     vides  a  method  for  transmitting  datagrams  over  serial
     point-to-point  links.  PPP allows for various options to be
     negotiated between the two hosts of a  point-to-point  link;
     these  options  provide  things such as peer authentication,
     header compression, link quality monitoring, and mapping  of
     control  characters. The PPP specifications are described in
     RFC 1331, The Point-to-Point Protocol for  the  Transmission
     of  Multi-protocol Datagrams over Point-to-Point Links   and
     RFC 1332, The PPP Internet Protocol Control Protocol (IPCP).

     The  pseudo  device  drivers  /dev/ipd,   /dev/ipdptp,   and
     /dev/ipdcm form the IP-dialup layer.  This layer provides IP
     network interfaces for dialup (connect on demand)  point-to-
     point  links.  The  ipd and ipdptp devices are the IP-dialup
     network interfaces.  The ipd  device  provides  a  point-to-
     multipoint  interface,  and  the  ipdptp  device  provides a
     point-to-point interface.   The  ipdcm  device  supplies  an
     interface  between  the  ipd  or  ipdptp  device  and a link
     manager.

     The ppp module and IP-dialup layer work together to  provide
     IP  connectivity  over serial point-to-point links.  A "link
     manager" daemon is responsible for setting  up  and  tearing
     down  these dialup connections.  Connections are established
     when an IP packet needs to be sent to the  remote  host,  or
     the  remote host has indicated its desire to establish a PPP
     connection.

     The ppp_diag module captures PPP layer  packets  and  parses
     the  contents  for  debugging purposes.  Usually, the parsed
     output is sent to the  strlog  facility  from  which  it  is
     retrieved  by  the  link  manager.   This  module  is pushed
     between the serial device and the ppp  module  by  the  link
     manager when debugging is enabled.

  Operation
     When a packet  is  routed  to  an  IP-dialup  point-to-point
     interface  which  is  not  currently connected to the remote
     host, the ipdcm driver sends a message to the  link  manager
     to  establish  the connection. The link manager opens a com-
     munications channel and  pushes  the  ppp  module  onto  the
     corresponding serial device.  The ppp module negotiates with
     the remote host on which options will be used for the  link.
     When  both  hosts  have agreed on a set of options, the link
     manager links the ppp module and  serial  device  underneath
     the ipd or ipdptp interface which is providing the IP inter-
     face to the remote host.

     Similarly, a remote host may initiate  a  connection  on  an
     enabled  communications port.  In this case the link manager
     receives the request and pushes  the  ppp  module  onto  the
     corresponding  device.  Once the ppp module has successfully
     negotiated on the set of options for the link with its peer,
     the  link  manager  links  the  ppp module and serial device
     underneath the ipd or ipdptp interface  which  is  providing
     the IP-dialup interface.

     When the ppp module  and  serial  device  have  been  linked
     underneath  the IP-dialup interface, IP packets are sent and
     received over the point-to-point link in PPP frames.

FILES
     /dev/ipd
           pseudo device  driver  that  provides  point-to-ipoint
           interface.

     /dev/ipdptp
           pseudo device driver that provides point-to-multipoint
           interface.

     /dev/ipdcm
           pseudo device driver that provides  interface  between
           ipd and ipdptp and link manager.

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | Availability                | SUNWpppk                    |
    |_____________________________|_____________________________|


SEE ALSO
     aspppd(1M), attributes(5)

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