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       atmdump - capture or generate ATM cells


       atmdump [-i] [ -t type [-g gfc] [-c] ] [itf.]vpi.vci


       atmdump captures or generates single ATM cells ("AAL0"). When capturing
       cells, a time stamp, the cell header contents, and a hex  dump  of  the
       cell  payload  are  shown.  When  sending  cells, the payload type, the
       generic flow control (GFC), and the cell loss  priority  (CLP)  can  be

       In  both modes of operation, the interface number, the VPI, and the VCI
       have to be specified.

       When sending, atmdump expects the cell payload on standard  input.   If
       only less than 48 bytes can be read, the remaining space is padded with
       zero bytes.


       -i     displays  timestamps  as  the  interval  since  the  last   cell
              reception.  By  default,  the  absolute  time is displayed. This
              options is ignored in transmit mode.

       -t type
              selects transmit mode and specifies the payload type. A list  of
              valid  payload  type numbers can be obtained by invoking atmdump
              without any arguments.

       -g gfc specifies the value of the GFC field. gfc has to be in the range
              from 0 to 15, default is zero.

       -c     sets  the  cell  loss priority flag, indicating low priority. By
              default, CLP is not set.


       Some device drivers may not pass OAM cells transparently.


       Werner Almesberger, EPFL ICA <>


       atmdiag(8), clip(8), sonetdiag(8)