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Will work once:

  nc -l 0.0.0.0 6127

  nc -l 6126 | nc 0.0.0.0 6127

  wget http://0.0.0.0:6126

  First 'nc -l' should hit.

Also works (once):

  mknod backpipe2 p
  nc -l 0.0.0.0 6124 0<backpipe2 | tee -a inflow | nc localhost 6125 | tee -a outflow 1>backpipe2

  nc -l localhost 6125

  wget http://0.0.0.0:6125