A network traffice control script edited for our env

# Borrowed from linux.org/how-to
# Edited by Zengqiang Xie XTS DC UnionPay
# tc uses the following units when passed as a parameter.
# kbps: Kilobytes per second
# mbps: Megabytes per second
# kbit: Kilobits per second
# mbit: Megabits per second
# bps: Bytes per second
# Amounts of data can be specified in:
# kb or k: Kilobytes
# mb or m: Megabytes
# mbit: Megabits
# kbit: Kilobits
# To get the byte figure from bits, divide the number by 8 bit
# Name of the traffic control command.
# The network interface we're planning on limiting bandwidth.
IF=eth0 # Interface
# Download limit (in mega bits)
DNLD=1mbit # DOWNLOAD Limit
# Upload limit (in mega bits)
UPLD=1mbit # UPLOAD Limit
# IP address of the machine we are controlling
IP= # Host IP
# Filter options for limiting the intended interface.
U32="$TC filter add dev $IF protocol ip parent 1:0 prio 1 u32"

start() {
# We'll use Hierarchical Token Bucket (HTB) to shape bandwidth.
# For detailed configuration options, please consult Linux man
# page.
$TC qdisc add dev $IF root handle 1: htb default 30
$TC class add dev $IF parent 1: classid 1:1 htb rate $DNLD ceil $DNLD
$TC class add dev $IF parent 1: classid 1:2 htb rate $UPLD ceil $UPLD
$U32 match ip dst $IP flowid 1:1
$U32 match ip src $IP flowid 1:2
# The first line creates the root qdisc, and the next two lines
# create two child qdisc that are to be used to shape download
# and upload bandwidth.
# The 4th and 5th line creates the filter to match the interface.
# The 'dst' IP address is used to limit download speed, and the
# 'src' IP address is used to limit upload speed.

stop() {
# Stop the bandwidth shaping.
$TC qdisc del dev $IF root
restart() {
# Self-explanatory.
sleep 1

show() {
# Display status of traffic control status.
$TC -s qdisc ls dev $IF

##main function added by zqxie
case "$1" in
echo -n "Starting bandwidth shaping: "
echo "done"
echo -n "Stopping bandwidth shaping: "
echo "done"
echo -n "Restarting bandwidth shaping: "
echo "done"
echo "Bandwidth shaping status for $IF:"
echo ""
echo "Usage: qos.sh {start|stop|restart|show}"
exit 0

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