Afin de brider la bande passante d’un serveur en giga (ici on la limité à 500mbps) utilisez ce script :
#!/bin/bash
#
# 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.
TC=/sbin/tc
# The network interface we're planning on limiting bandwidth.
IF=eth0 # Interface
# Download limit (in mega bits)
#DNLD=1mbit # DOWNLOAD Limit
DNLD=500mbps # DOWNLOAD Limit
# Upload limit (in mega bits)
#UPLD=1mbit # UPLOAD Limit
UPLD=500mbps # UPLOAD Limit
# IP address of the machine we are controlling
IP=0.0.0.0 # Host IP
# Masque
MAS=0
# 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
$TC class add dev $IF parent 1: classid 1:2 htb rate $UPLD
$U32 match ip dst $IP/$MAS flowid 1:1
$U32 match ip src $IP/$MAS 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.
stop
sleep 1
start
}
show() {
# Display status of traffic control status.
$TC -s qdisc ls dev $IF
}
case "$1" in
start)
echo -n "Starting bandwidth shaping: "
start
echo "done"
;;
stop)
echo -n "Stopping bandwidth shaping: "
stop
echo "done"
;;
restart)
echo -n "Restarting bandwidth shaping: "
restart
echo "done"
;;
show)
echo "Bandwidth shaping status for $IF:"
show
echo ""
;;
*)
pwd=$(pwd)
echo "Usage: tc.bash {start|stop|restart|show}"
;;
esac
exit 0
