NAME

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

SYNOPSIS

       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 ]]

DESCRIPTION

       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.

OPTIONS

       -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 established.

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

       -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
              option.

       -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.

EXAMPLES

       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 /etc/hosts.atm.

       ATM=/usr/src/atm
       case "$1" in
       start)
           cd $ATM
           if [ -x sigd/atmsigd ] ; then
                      sigd/atmsigd -b
           fi
           if [ -x ilmid/ilmid ] ; then
                      ilmid/ilmid -b -x
           fi
           if [ -x led/zeppelin ] ; then
                      led/zeppelin -2 -n sampo -i2 -l jaarli3 &
                      ifconfig lec2 10.10.10.208 \
                                  netmask 255.255.255.192 \
                                  broadcast 10.10.10.255
                      ifconfig lec2 up
                      route add default gw 10.10.10.193
           fi
           if [ -x mpoad/mpcd ] ; then
                      mpoad/mpcd -i2 -s jaarli1 -l jaarli2 &
                      #mpoad/mpcd -i2 -s jaarli1 -l jaarli2 \
                                  -L jaarli3 -n sampo &
           fi
           ;;
       esac
       exit 0

BUGS

       Supports only Ethernet type of ELANs. Probably others too.

AUTHORS

       Heikki Vatiainen <hessu@cs.tut.fi>, Sampo Saaristo <s156953@cs.tut.fi>

SEE ALSO

       zeppelin(8), atmsigd(8)