Provided by: bwctl-server_1.5.4+dfsg1-1_i386 bug


       bwctld - Bandwidth Control server.


       bwctld  [  -a  auth_mode  ] [ -c conf_dir ] [ -e facility ] [ -f ] [ -G
       group ] [ -h ] [ -R var_dir ] [ -S nodename:port ] [ -U user ] [ -v ] [
       -Z ]


       bwctld  is a server program designed to schedule and run Iperf, Thrulay
       or Nuttcp, Ping, Traceroute, Tracepath, and Owamp tests.

       Aside  from  actually  running  network  measurement  tests,  the  main
       function of bwctld is to determine which tests are allowable based upon
       the policy restrictions configured by the system administrator.

       bwctld was designed to be run as a stand-alone daemon process. It  uses
       the classic accept/fork model of handling new requests.

       Most  of  the command line options for bwctld have analogous options in
       the bwctld.conf file. The command line takes precedence.


       -a auth_mode
              Specify the authentication modes the server is  willing  to  use
              for communication. auth_mode should be set as a character string
              with any or all of the characters "AEO". The modes are:

              A      [A]uthenticated.   This   mode   encrypts   the   control

              E      [E]ncrypted.  This  mode encrypts the control connection.
                     If  the  test  supports  encryption,   this   mode   will
                     additionally  encrypt the test stream. (Encryption of the
                     test stream is not currently supported, so this  mode  is
                     currently identical to authenticated.)

              O      [O]pen. No encryption of any kind is done.

              The server can specify all the modes with which it is willing to
              communicate. The most strict mode that both the server  and  the
              client are willing to use will be selected.


       -c conf_dir
              Specify the directory that holds the bwctld configuration files.

                     Current working directory.

       -e facility
              Syslog facility to which messages are logged.


       -f     Enables  the  bwctld  daemon to run with root permissions. There
              are legitimate reasons to run bwctld as root, but it  is  risky.
              Forcing  this  additional  option  will make it less likely root
              permissions are accidently used.

       -G group
              Specify the gid for the bwctld process. group can  be  specified
              using  a  valid group name or by using -gid. This option is only
              used if bwctld is started as root.

       -h     Print a help message.

       -R var_dir
              Specify the directory to hold the file.

                     Current directory

       -S nodename:port
              Specify the address and port on which  bwctld  will  listen  for
              requests.   nodename  can be specified using a DNS name or using
              the textual representation of the address. It is possible to set
              the  source  address  without setting the port simply by leaving
              off the ':' and  port  specification.  If  an  IPv6  address  is
              specified,  note  that  the accepted format contains nodename in
              square brackets, such as: [fe80::fe9f:62d8].  This  ensures  the
              port number is distinct from the address specification.

                     nodename   is   wildcarded  as  any  currently  available
                     address.  port is 4823.

       -U user
              Specify the uid for the bwctld process. user  can  be  specified
              using  a  valid  user name or by using -uid. This option is only
              used if bwctld is started as root.

       -v     Set verbose output. Messages will only go to syslog  unless  the
              -Z option is specified.

       -Z     Run  the  master bwctld process in the foreground. In this mode,
              error messages are printed to stderr as well as  being  sent  to
              syslog.  Also,  normal  terminal  controls are available. (i.e.,
              <Cntr-C> will cause the daemon to kill it's child processes  and
              exit.) This is useful for debugging.


       The  bwctld  daemon  prefers  a  reasonably  synchronized  clock. It is
       scheduling tests and needs to be sure it has the same idea  of  when  a
       test should take place as does the peer test system.  Therefore, bwctld
       attempts to use NTP specific system calls to determine the accuracy  of
       the  local  clock.  If  those  system  calls  are  unavailable,  or the
       administrator has set the allow_unsync option in the bwctld.conf  file,
       then   bwctld   will   blindly  accept  tests  assuming  the  clock  is
       synchronized to within the sync_fuzz value that is also defined in  the
       bwctld.conf  file. If this assumption does not hold true, then the test
       will eventually fail. Unfortunately, because the  time  offset  is  not
       detected early, this test will have taken up a schedule slot.



       There  are  more  details  on  configuring  the  bwctld  daemon  in the
       bwctld.conf(5) manual page. Details on configuring the policy is in the
       bwctld.limits(5)  and  bwctld.keys(5) manual pages.  Information on the
       client is in the bwctl(1) manual page.  For more of an overview of  the
       full       functionality       and       architecture      see      the web site.

       For details on Iperf3, see the web site.

       For details on Iperf, see the web

       For          details         on         Nuttcp,         see         the web site.

       For details on Owamp, see the  web


       This  material  is  based  in  part  on  work supported by the National
       Science Foundation (NSF) under Grant  No.  ANI-0314723.  Any  opinions,
       findings  and conclusions or recommendations expressed in this material
       are those of the author(s) and do not necessarily reflect the views  of
       the NSF.

                                    $Date$                           bwctld(8)