Linux下用tc控制网络延时和丢包率

 

tc修改网络延时：  

sudo tc qdisc add dev eth0 root netem delay 1000ms

删除策略：

sudo tc qdisc del dev eth0 root netem delay 1000ms

 

验证效果：

PING myhost (192.168.0.2) 56(84) bytes of data.
64 bytes from myhost (192.168.0.2): icmp_seq=1 ttl=64 time=1000 ms

64 bytes from myhost (192.168.0.2): icmp_seq=1 ttl=64 time=1000 ms

64 bytes from myhost (192.168.0.2): icmp_seq=1 ttl=64 time=1000 ms

修改丢包率：
sudo tc qdisc add dev eth0 root netem loss 10%

删除策略：
sudo tc qdisc del dev eth0 root netem loss 10%

=====================================================================

• 查看流量管理：   tc     qdisc    show
• 配置网络延时：

• # tc qdisc del dev eth0 root netem loss 10%
  [root@AutoTest ~]# tc qdisc show
  qdisc pfifo_fast 0: dev eth0 root refcnt 2 bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
  [root@AutoTest ~]# tc qdisc add dev eth0 root netem delay 1000ms 
  [root@AutoTest ~]# ping 192.168.0.1
  PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
  64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=2001 ms
  64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=1001 ms
  ^C
  --- 192.168.0.1 ping statistics ---
  6 packets transmitted, 5 received, 16% packet loss, time 5846ms
  rtt min/avg/max/mdev = 1000.520/1200.819/2001.001/400.092 ms, pipe 3
  [root@AutoTest ~]# tc qdisc del dev eth0 root netem delay 1000ms 
  [root@AutoTest ~]# ping 192.168.0.1
  PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
  64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=0.465 ms
  64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=0.546 ms
  ^C
  --- 192.168.0.1 ping statistics ---
  2 packets transmitted, 2 received, 0% packet loss, time 1841ms
  rtt min/avg/max/mdev = 0.465/0.505/0.546/0.046 ms
  [root@AutoTest ~]# 

• 配置网络丢包率
  # tc qdisc del dev eth0 root netem loss 10%
  RTNETLINK answers: Invalid argument
  [root@AutoTest ~]# tc qdisc add dev eth0 root netem loss 10%
  [root@AutoTest ~]# tc qdisc show
  qdisc netem 8005: dev eth0 root refcnt 2 limit 1000 loss 10%
  [root@AutoTest ~]# ping 192.168.0.1 -n 20
  PING 20 (0.0.0.20) 56(124) bytes of data.
  ^C
  --- 20 ping statistics ---
  7 packets transmitted, 0 received, 100% packet loss, time 6371ms
  
  [root@AutoTest ~]# ping 192.168.0.1 -c 20
  PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
  64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=0.533 ms
  64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=0.506 ms
  64 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=0.471 ms
  64 bytes from 192.168.0.1: icmp_seq=5 ttl=64 time=0.550 ms
  64 bytes from 192.168.0.1: icmp_seq=7 ttl=64 time=0.474 ms
  64 bytes from 192.168.0.1: icmp_seq=8 ttl=64 time=0.499 ms
  64 bytes from 192.168.0.1: icmp_seq=10 ttl=64 time=0.541 ms
  64 bytes from 192.168.0.1: icmp_seq=11 ttl=64 time=0.470 ms
  64 bytes from 192.168.0.1: icmp_seq=12 ttl=64 time=0.531 ms
  64 bytes from 192.168.0.1: icmp_seq=13 ttl=64 time=0.476 ms
  64 bytes from 192.168.0.1: icmp_seq=14 ttl=64 time=0.503 ms
  64 bytes from 192.168.0.1: icmp_seq=15 ttl=64 time=0.508 ms
  64 bytes from 192.168.0.1: icmp_seq=16 ttl=64 time=0.541 ms
  64 bytes from 192.168.0.1: icmp_seq=19 ttl=64 time=0.531 ms
  64 bytes from 192.168.0.1: icmp_seq=20 ttl=64 time=0.536 ms
  
  --- 192.168.0.1 ping statistics ---
  20 packets transmitted, 15 received, 25% packet loss, time 19999ms
  rtt min/avg/max/mdev = 0.470/0.511/0.550/0.033 ms
  
  # tc qdisc del dev eth0 root netem loss 10%
  [root@AutoTest ~]# ping 192.168.0.1 -c 20
  PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
  64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=0.827 ms
  64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=0.508 ms
  64 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=0.506 ms
  64 bytes from 192.168.0.1: icmp_seq=4 ttl=64 time=0.574 ms
  64 bytes from 192.168.0.1: icmp_seq=5 ttl=64 time=0.555 ms
  64 bytes from 192.168.0.1: icmp_seq=6 ttl=64 time=0.495 ms
  64 bytes from 192.168.0.1: icmp_seq=7 ttl=64 time=0.517 ms
  64 bytes from 192.168.0.1: icmp_seq=8 ttl=64 time=0.529 ms
  64 bytes from 192.168.0.1: icmp_seq=9 ttl=64 time=0.515 ms
  64 bytes from 192.168.0.1: icmp_seq=10 ttl=64 time=0.571 ms
  64 bytes from 192.168.0.1: icmp_seq=11 ttl=64 time=0.508 ms
  64 bytes from 192.168.0.1: icmp_seq=12 ttl=64 time=0.533 ms
  64 bytes from 192.168.0.1: icmp_seq=13 ttl=64 time=0.526 ms
  64 bytes from 192.168.0.1: icmp_seq=14 ttl=64 time=0.520 ms
  64 bytes from 192.168.0.1: icmp_seq=15 ttl=64 time=0.532 ms
  64 bytes from 192.168.0.1: icmp_seq=16 ttl=64 time=0.549 ms
  64 bytes from 192.168.0.1: icmp_seq=17 ttl=64 time=0.527 ms
  64 bytes from 192.168.0.1: icmp_seq=18 ttl=64 time=0.575 ms
  64 bytes from 192.168.0.1: icmp_seq=19 ttl=64 time=0.534 ms
  64 bytes from 192.168.0.1: icmp_seq=20 ttl=64 time=0.556 ms
  
  --- 192.168.0.1 ping statistics ---
  20 packets transmitted, 20 received, 0% packet loss, time 19000ms
  rtt min/avg/max/mdev = 0.495/0.547/0.827/0.074 ms
  [root@AutoTest ~]#