i used this quite extensively to work on tcp
     SYNOPSIS
          nettest -l [ -s sleepms ][ -n nblocks ]
          nettest [ -a addr ][ -s sleepms ]
          nettest -r raddr -n nblocks
    DESCRIPTION
          Nettest tests goodput of reliable, in-order transports at
          full speed, and with receiver throttling.  Both sender and
[...]