#!/bin/bash

IF0=eth0
IF1=eth2

function clear_tc()
{
	tc qdisc del dev $IF0 root 2>/dev/null >/dev/null
	tc qdisc del dev $IF1 root 2>/dev/null >/dev/null
}

if [ "$1" == "clear" ] ; then
	clear_tc
	exit
fi


if [ $# -lt "3" ] ; then
	echo "Usage: $0 <bandwidth> <delay> <delay-variation> [packet-loss]"
	echo "eg.: $0 2mbit 50ms 0ms"
	echo "eg.: $0 56kbit 100ms 10ms 0.8%"
	echo ""
	echo "or: $0 clear"
	exit
fi

DIST="distribution normal"

if [ $3 == "0ms" ] ; then 
	DIST=""
fi

LOSS=""
if [ $# == "4" ] ; then
	#packetloss fails if the simulated bandwidth is to small
	#tc qdisc add dev $IF1 parent 1:1 netem loss $4
	LOSS="loss $4"
fi

clear_tc

tc qdisc add dev $IF0 root handle 1: tbf rate $1 buffer 100000 limit 300000
tc qdisc add dev $IF0 parent 1:1 handle 2: netem delay $2 $3 $DIST $LOSS

tc qdisc add dev $IF1 root handle 1: tbf rate $1 buffer 100000 limit 300000


tc qdisc