David at 16:29, 24 September 2012

2012-09-24T16:29:38Z

David: Created page with "== Sample Script to start/stop Bandwidth Shaping == This script restricts eth0 on 172.28.0.1 to 250KB/s or 2mbits upload/download speeds #!/bin/bash # # tc uses the fo..."

2012-09-24T16:26:31Z

Created page with "== Sample Script to start/stop Bandwidth Shaping == This script restricts eth0 on 172.28.0.1 to 250KB/s or 2mbits upload/download speeds <syntaxhighlight> #!/bin/bash # # tc uses the fo..."

New page

== Sample Script to start/stop Bandwidth Shaping ==
This script restricts eth0 on 172.28.0.1 to 250KB/s or 2mbits upload/download speeds
<syntaxhighlight>
#!/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=2mbit # DOWNLOAD Limit

# Upload limit (in mega bits)
UPLD=2mbit # UPLOAD Limit

# IP address of the machine we are controlling
IP=172.28.0.1 # 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
$TC class add dev $IF parent 1: classid 1:2 htb rate $UPLD
$U32 match ip dst $IP/32 flowid 1:1
$U32 match ip src $IP/32 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
</syntaxhighlight>

← Older revision		Revision as of 16:29, 24 September 2012
Line 1:		Line 1:
		+	Use the tool <tt>tc</tt> to control the network bandwidth
		+
		+	== Show any restrictions already in place ==
		+	<syntaxhighlight>
		+	[root@amdquad scratch]# tc qdisc list
		+	qdisc mq 0: dev eth0 root
		+	qdisc mq 0: dev eth1 root
		+	</syntaxhighlight>
		+
		+
	== Sample Script to start/stop Bandwidth Shaping ==		== Sample Script to start/stop Bandwidth Shaping ==
	This script restricts eth0 on 172.28.0.1 to 250KB/s or 2mbits upload/download speeds		This script restricts eth0 on 172.28.0.1 to 250KB/s or 2mbits upload/download speeds

Bandwidth Shaping: Throttling eth0 upload/download speeds - Revision history

David at 16:29, 24 September 2012

David: Created page with "== Sample Script to start/stop Bandwidth Shaping == This script restricts eth0 on 172.28.0.1 to 250KB/s or 2mbits upload/download speeds #!/bin/bash # # tc uses the fo..."