tc

tc는 Traffic Control의 약자로, 리눅스 커널에서 제공하는 네트워크 트래픽을 관리하고 제어하는 명령어, 다양한 형태의 트래픽 쉐이핑, 큐잉, 필터링을 설정할 수 있다.

shell

#!/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
#
 
# tc명령어의 위치를 입력합니다.
TC=/sbin/tc
 
# 대역폭을 제한하기 위한 이더넷 인터페이스를 지정합니다.
IF=ens192
 
# 다운로드 속도 제한
DNLD=50mbps
 
# 업로드 속도 제한
UPLD=50mbps
 
# 속도 제한을 적용할 호스트의 IP 주소
IP=10.189.50.240
 
# 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