OS X bandwidth throttling

throttle.bash

function dethrottle {
  sudo ipfw delete 1
}

function throttle {
  if test $# -eq 0
  then
    echo 'throttle <port> <bandwidth (KB)>'
  elif test $# -eq 1
  then
    # default to port 3000 if only argument given
    sudo ipfw pipe 1 config bw $1KByte/s && sudo ipfw add 1 pipe 1 src-port 3000 && sudo ipfw add 1 pipe 1 dst-port 3000
  elif test $# -eq 2
  then
    sudo ipfw pipe 1 config bw $2KByte/s && sudo ipfw add 1 pipe 1 src-port $1 && sudo ipfw add 1 pipe 1 dst-port $1
  fi
}