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       mpcd - ATM MPOA (Multi-Protocol Over ATM) client daemon


       mpcd  [  -s  Control  ATM  address  ]  [ -l Data ATM address ] [ -c MPS
       control ATM address ] [ -i Interface number ] [ -m MPS MAC address ]  [
       -L LEC address [ -n ELAN name ] [ -C LECS Address ]]


       MPOA   client   (MPC)   is   responsible  for  creating  and  receiving
       internetwork  layer  shortcuts.  Using  these  shortcuts  MPCs  forward
       unicast  internetwork  layer  packets effectively over ATM without need
       for routing protocols.

       MPC has two roles; ingress and egress.  In  ingress  role  MPC  detects
       flows destined outside it’s own subnet and tries to establish shortcuts
       to those destinations. In egress role MPC accepts shortcuts and packets
       arriving  on  those  shortcuts.  Maintaining shortcuts is done with the
       help of MPOA server (MPS).

       Just as the Linux LAN Emulation client, MPOA client is also divided  in
       two  parts.  The  parts  are kernel component and a daemon process. The
       daemon opens and receives data shortcuts and control  connections  with
       the  kernel component. The kernel component tallies packets flowing out
       from the LANE device and makes the  decision  if  a  packet  should  be
       forwarded using LANE or MPOA shortcuts.

       If  the  daemon  is  killed  with  SIGHUP  it  will  close all the open
       connections, purge ingress and egress  cache  entries,  query  LECS  if
       applicable and then restart itself.

       Linux  MPOA client only supports non-LLC-muxed shortcuts. The number of
       supported MPOA clients is unlimited.


       -s Control ATM address
              Local ATM address this MPC uses for MPOA control connections.

       -l Data ATM address
              Local  ATM  address  from  and  to  which  MPOA  shortcuts   are

       -c MPS control ATM address
              ATM  address  of MPS. Only needed if MPS can not advertise it by

       -i Interface number
              The interface number of LEC this MPC serves. E.g. 2 for  "lec2".

       -m MPS MAC address
              MAC  address of default router where MPS recides. Only useful if
              the MPOA server fails to advertise itself.

       -L LEC address
              Listen address of the  LANE  client  zeppelin.  mpcd  uses  this
              address  as  its  own  ATM  address when it queries LECS for MPC
              configuration parameters. If this option  is  not  present  then
              mpcd  will  not  use LECS to query for configuration parameters.
              This option is normally the same as zeppelin’s -l option.

       -n ELAN name
              Name of the ELAN for which mpcd  asks  for  parameters  when  it
              connects  to  LECS.   If  this  option is not given, LECS should
              respond with parameters belonging to the  default  ELAN  if  one
              exists.  This  option  is  normally  the  same  as zeppelin’s -n

       -C LECS address
              ATM address of LECS mpcd asks for parameters. If this option  is
              left  empty  and -L is given, mpcd uses ATM Forum assigned Well-
              Known  LECS  address.  This  option  is  normally  the  same  as
              zeppelin’s -c option.


       This  script  snippet  shows  how  to  run  LANE  and  MPOA.  After UNI
       signalling and ILMI have been started LANE (zeppelin) and  MPOA  (mpcd)
       are  started. The commented out line shows how to start mpcd so that it
       queries LECS for MPC parameters.

       Arguments  jaarli[1-3]  are  local  ATM  addresses   listed   in   file

       case "$1" in
           cd $ATM
           if [ -x sigd/atmsigd ] ; then
                      sigd/atmsigd -b
           if [ -x ilmid/ilmid ] ; then
                      ilmid/ilmid -b -x
           if [ -x led/zeppelin ] ; then
                      led/zeppelin -2 -n sampo -i2 -l jaarli3 &
                      ifconfig lec2 \
                                  netmask \
                      ifconfig lec2 up
                      route add default gw
           if [ -x mpoad/mpcd ] ; then
                      mpoad/mpcd -i2 -s jaarli1 -l jaarli2 &
                      #mpoad/mpcd -i2 -s jaarli1 -l jaarli2 \
                                  -L jaarli3 -n sampo &
       exit 0


       Supports only Ethernet type of ELANs. Probably others too.


       Heikki Vatiainen <>, Sampo Saaristo <>


       zeppelin(8), atmsigd(8)