[ 리눅스 - 네트워크 ] random drop / rando dealy / jitter
전설속의미… 2023-11 2023-11-26 17:20:59 조회 1277 추천 0
구글링으로 리눅스 서버 또는 클라이언트에서 시험 용도로 사용할 만한 해당 툴이 있나 살펴 보았는데, 검색에 실패 하였습니다.
감사합니다.
tc 명령에서 netem(네트워크 에뮬레이트) 으로 드롭이나 딜레이 할 수 있다고 합니다.
https://www.pico.net/kb/how-can-i-simulate-delayed-and-dropped-packets-in-linux/
Add 10ms of delay to every packet transmitted on eth0:
$ tc qdisc add dev eth0 root netem delay 10ms
Add 10ms of delay and 20ms of jitter to every packet bridged by br0:
$ tc qdisc add dev br0 root netem delay 10ms 20ms
Randomly drop approximately one percent of packets transmitted on eth1:
$ tc qdisc add dev eth1 root netem loss 1%
====
## DROP packet with ratio
❯ uname -mrs
Linux 5.10.199-190.747.amzn2.x86_64 x86_64
❯ sudo iptables -A INPUT -p icmp --icmp-type echo-request -m statistic --mode random --probability 0.50 -j DROP
❯ sudo iptables -L --line-numbers
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 DROP icmp -- anywhere anywhere icmp echo-request statistic mode random probability 0.500000
00000 # <================== !!!
Chain FORWARD (policy DROP)
....
❯ ping -c 10 43.200.105.82
0 ▁ 10 ▂ 20 ▃ 30 ▄ 40 ▅ 50 ▆ 60 ▇ 70 █ 80 ▁ 90 ▂ 100 ▃ 110 ▄ 120 ▅ 130 ▆ 140 ▇ 150 █ 160 ▁ 170 ▂ 180 ▃ 190 ▄ 200 ▅ 210 ▆ 220 ▇
230 █ ∞
PING 43.200.105.82 (43.200.105.82): 56 data bytes
▁▁!▁!▁▁!!
4/ 9 (44%) lost; 3/ 4/ 5ms; last: 5ms
4/ 9 (44%) lost; 3/ 4/ 5/ 1ms (last 5)
--- 43.200.105.82 ping statistics ---
10 packets transmitted, 5 packets received, 50.0% packet loss # <============ !!!
round-trip min/avg/max/stddev = 3.628/4.190/5.252/0.619 ms