LOOPBACK man page on Plan9

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LOOPBACK(3)							   LOOPBACK(3)

       loopback - network link simulation

       bind -a #X /net


       The  loopback  interface, /net/loopbackn, is a directory containing two
       subdirectories, one for each end of a simulated network link.  The num‐
       ber n is the device number of the link, permitting multiple links to be
       used on a single machine.

       Each directory contains files to	 control  the  associated  connection,
       receive	and  send  data, monitor the simulation parameters, and supply

       The data files for the two directories are cross-connected.  Writes  to
       one are divided into packets of at most a certain size, typically 32768
       bytes, written to a flow-controlled output  queue,  transferred	across
       the  link,  and	put  into an input queue where it is readable from the
       other data file.

       Options are set by writing to the ctl file for the receiving end of the
       link,  and are reported in the same format by reading status.  The fol‐
       lowing options are supported.

       delay latency bytedelay
	      Control the time a packet takes in the link.  A packet  n	 bytes
	      long  takes  bytedelay  * n nanoseconds to exit the output queue
	      and is available for reading latency nanoseconds later.

       droprate n
	      Randomly drop approximately one out of n packets.	 If zero  drop
	      no packets.

       indrop [01]
	      Disallow or allow packets to be dropped if the input queue over‐

       limit n
	      Set the input and output queues to hold at most n bytes.

       reset  Clear all of the statistics recorded for the link.

       Reading stats returns a list of 4 tagged numbers representing:
	    packets sent to this receiver
	    bytes sent to this receiver
	    packets dropped due to droprate
	    packets dropped due to input queue overflows


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