如何使用tc模拟网络延迟和丢包
修改网络延时： sudo tc qdisc add dev eth0 root netem delay 1000ms
查看流量管理：tc qdisc show
删除策略：sudo tc qdisc del dev eth0 root netem delay 1000ms
验证效果：ping 192.168.102.124 -c 20
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%
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配置网络超时
[root@dev-xx-xx ~]# tc qdisc del dev eth0 root netem delay 100ms RTNETLINK answers: Invalid argument [root@dev-xx-xx ~]# tc qdisc show qdisc mq 0: dev eth0 root qdisc pfifo_fast 0: dev eth0 parent :1 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1 qdisc pfifo_fast 0: dev eth0 parent :2 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1 qdisc pfifo_fast 0: dev eth0 parent :3 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1 qdisc pfifo_fast 0: dev eth0 parent :4 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1 [root@dev-xx-xx ~]# tc qdisc add dev eth0 root netem delay 100ms [root@dev-xx-xx ~]# ping 192.168.102.124 PING 192.168.102.124 (192.168.102.124) 56(84) bytes of data. 64 bytes from 192.168.102.124: icmp_seq=1 ttl=64 time=0.074 ms 64 bytes from 192.168.102.124: icmp_seq=2 ttl=64 time=0.066 ms 64 bytes from 192.168.102.124: icmp_seq=3 ttl=64 time=0.080 ms 64 bytes from 192.168.102.124: icmp_seq=4 ttl=64 time=0.043 ms 64 bytes from 192.168.102.124: icmp_seq=5 ttl=64 time=0.084 ms 64 bytes from 192.168.102.124: icmp_seq=6 ttl=64 time=0.094 ms ^C --- 192.168.102.124 ping statistics --- 12 packets transmitted, 12 received, 0% packet loss, time 11131ms rtt min/avg/max/mdev = 0.043/0.081/0.107/0.018 ms [root@dev-xx-xx ~]# tc qdisc del dev eth0 root netem delay 100ms [root@dev-xx-xx ~]# tc qdisc del dev eth0 root netem delay 100ms RTNETLINK answers: Invalid argument
配置网络丢包率
[root@dev-xx-xx ~]# tc qdisc del dev eth0 root netem loss 10% RTNETLINK answers: Invalid argument [root@dev-xx-xx ~]# tc qdisc add dev eth0 root netem loss 10% [root@dev-xx-xx ~]# tc qdisc show qdisc netem 8005: dev eth0 root refcnt 5 limit 1000 loss 10% [root@dev-xx-xx ~]# ping 192.168.102.124 -n 20 PING 20 (0.0.0.20) 56(124) bytes of data. ^C --- 20 ping statistics --- 21 packets transmitted, 0 received, 100% packet loss, time 20650ms [root@dev-xx-xx ~]# ping 192.168.102.124 -c 20 PING 192.168.102.124 (192.168.102.124) 56(84) bytes of data. 64 bytes from 192.168.102.124: icmp_seq=1 ttl=64 time=0.101 ms 64 bytes from 192.168.102.124: icmp_seq=2 ttl=64 time=0.062 ms 64 bytes from 192.168.102.124: icmp_seq=3 ttl=64 time=0.098 ms 64 bytes from 192.168.102.124: icmp_seq=4 ttl=64 time=0.098 ms 64 bytes from 192.168.102.124: icmp_seq=5 ttl=64 time=0.062 ms 64 bytes from 192.168.102.124: icmp_seq=6 ttl=64 time=0.088 ms 64 bytes from 192.168.102.124: icmp_seq=7 ttl=64 time=0.045 ms 64 bytes from 192.168.102.124: icmp_seq=8 ttl=64 time=0.070 ms 64 bytes from 192.168.102.124: icmp_seq=9 ttl=64 time=0.062 ms 64 bytes from 192.168.102.124: icmp_seq=10 ttl=64 time=0.066 ms 64 bytes from 192.168.102.124: icmp_seq=11 ttl=64 time=0.088 ms 64 bytes from 192.168.102.124: icmp_seq=12 ttl=64 time=0.070 ms 64 bytes from 192.168.102.124: icmp_seq=13 ttl=64 time=0.089 ms 64 bytes from 192.168.102.124: icmp_seq=14 ttl=64 time=0.087 ms 64 bytes from 192.168.102.124: icmp_seq=15 ttl=64 time=0.054 ms 64 bytes from 192.168.102.124: icmp_seq=16 ttl=64 time=0.085 ms 64 bytes from 192.168.102.124: icmp_seq=17 ttl=64 time=0.064 ms 64 bytes from 192.168.102.124: icmp_seq=18 ttl=64 time=0.124 ms 64 bytes from 192.168.102.124: icmp_seq=19 ttl=64 time=0.063 ms 64 bytes from 192.168.102.124: icmp_seq=20 ttl=64 time=0.108 ms --- 192.168.102.124 ping statistics --- 20 packets transmitted, 20 received, 0% packet loss, time 19000ms rtt min/avg/max/mdev = 0.045/0.079/0.124/0.020 ms [root@dev-xx-xx ~]# tc qdisc del dev eth0 root netem loss 10% [root@dev-xx-xx ~]# ping 192.168.102.124 -c 20 PING 192.168.102.124 (192.168.102.124) 56(84) bytes of data. 64 bytes from 192.168.102.124: icmp_seq=1 ttl=64 time=0.041 ms 64 bytes from 192.168.102.124: icmp_seq=2 ttl=64 time=0.132 ms 64 bytes from 192.168.102.124: icmp_seq=3 ttl=64 time=0.344 ms 64 bytes from 192.168.102.124: icmp_seq=4 ttl=64 time=0.404 ms 64 bytes from 192.168.102.124: icmp_seq=5 ttl=64 time=0.086 ms 64 bytes from 192.168.102.124: icmp_seq=6 ttl=64 time=0.088 ms 64 bytes from 192.168.102.124: icmp_seq=7 ttl=64 time=0.063 ms 64 bytes from 192.168.102.124: icmp_seq=8 ttl=64 time=0.109 ms 64 bytes from 192.168.102.124: icmp_seq=9 ttl=64 time=0.064 ms 64 bytes from 192.168.102.124: icmp_seq=10 ttl=64 time=0.092 ms 64 bytes from 192.168.102.124: icmp_seq=11 ttl=64 time=0.044 ms 64 bytes from 192.168.102.124: icmp_seq=12 ttl=64 time=0.066 ms 64 bytes from 192.168.102.124: icmp_seq=13 ttl=64 time=0.094 ms 64 bytes from 192.168.102.124: icmp_seq=14 ttl=64 time=0.097 ms 64 bytes from 192.168.102.124: icmp_seq=15 ttl=64 time=0.108 ms 64 bytes from 192.168.102.124: icmp_seq=16 ttl=64 time=0.043 ms 64 bytes from 192.168.102.124: icmp_seq=17 ttl=64 time=0.093 ms 64 bytes from 192.168.102.124: icmp_seq=18 ttl=64 time=0.056 ms 64 bytes from 192.168.102.124: icmp_seq=19 ttl=64 time=0.093 ms 64 bytes from 192.168.102.124: icmp_seq=20 ttl=64 time=0.039 ms --- 192.168.102.124 ping statistics --- 20 packets transmitted, 20 received, 0% packet loss, time 18999ms rtt min/avg/max/mdev = 0.039/0.107/0.404/0.093 ms [root@dev-xx-xx ~]#
case
1）模拟延迟传输：
# tc qdisc add dev eth0 root netem delay 100ms
2）模拟延迟波动：
# tc qdisc add dev eth0 root netem delay 100ms 10ms
3）延迟波动随机性：
# tc qdisc add dev eth0 root netem delay 100ms 10ms 30%
4）模拟网络丢包：
# tc qdisc add dev eth0 root netem loss 1%
5）网络丢包成功率：
# tc qdisc add dev eth0 root netem loss 1% 30%
6）删除相关配置：
# tc qdisc del dev eth0 root netem delay 100ms
7）模拟包重复：
# tc qdisc add dev eth0 root netem duplicate 1%
8）模拟包损坏：
# tc qdisc add dev eth0 root netem corrupt 0.2%
9）查看网卡配置：
# tc qdisc show dev eth0
10）查看丢包率：
# tc -s qdisc show dev eth0