#!/bin/bash

# 10kbit  up (..KB) =>  30kbit down
# 20kbit  up (5.2KB) => ..kbit down
# 100kbit up (KB) => ..kbit down

# also a possible notation:
# 15kbps
UPLINK=60kbit

start()
{
  sudo tc qdisc del dev eth0 root 2>/dev/null
  sudo tc qdisc add dev eth0 root tbf rate $UPLINK latency 50ms burst 1540
}

stop()
{
  sudo tc qdisc del dev eth0 root 2>/dev/null
}

status()
{
  echo -e "** Local Routing Table **\n"
  ip route list table local

  echo -e "\n** Main Routing Table **\n"
  ip route list table main

  echo -e "\n** Qdisc Parameters **\n"
  tc qdisc ls dev eth0

  echo -e "\n** Class Parameters **\n"
  tc class ls dev eth0

  echo -e "\n** Filter Parameters **\n"
  tc filter ls dev eth0

}

usage()
{
   echo -e "Usage: " $0 "  [ start | stop | status | info ]\n"
   echo -e " start    - start traffic shaping"
   echo -e " stop     - stop traffic shaping"
   echo -e " status   - display traffic-shaping information"
   echo -e " info     - display some pre-defined shaping values"
}

if [ ! $1 ] ; then
  usage
  exit 1
fi

if [ $1 = "start" ] ; then
  start
  exit 0
elif [ $1 = "stop" ] ; then
  stop
  exit 0
elif [ $1 = "status" ] ; then
  status
  exit 0
elif [ $1 = "info" ] ; then
  info
  exit 0
fi