如何用NETEM进行tc过滤?

本文介绍了如何用NETEM进行tc过滤?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我需要一些帮助将 netem 延迟定向到特定 IP.我已经正确输入了所有命令，没有错误，如所附图片所示.我的速度测试没有延迟.有关更多信息，当我使用命令:tc qdisc add dev eth0 root netem delay 100ms"时，延迟被完美添加.我究竟做错了什么 ?

I need some help directing netem delays to a specific IP. I have inputted all the commands correctly with no errors and as shown in the pictures attached. I have no latency being added to my speed tests. For further information when I used the command: "tc qdisc add dev eth0 root netem delay 100ms" the delays are added flawlessly. What am I doing wrong ?

附言我是使用TC和NETEM的初学者，所以如果有任何解决方案，请在解释时彻底.

P.S. I am a beginner at using TC and NETEM, so please if any solutions are given please be thorough when explaining.

以下是一些屏幕截图，以便更好地理解我的问题:

Here are some screenshots for a better understanding towards my problem:

http://postimg.org/image/k9pu6uhxv/http://postimg.org/image/tis0gyqtv/

推荐答案

tc qdisc del dev eth0 root
tc qdisc add dev eth0 root handle 1: htb
tc class add dev eth0 parent 1: classid 1:1 htb rate 100mbit
tc filter add dev eth0 parent 1: protocol ip prio 1 u32 flowid 1:1 match ip dst 192.168.2.219
tc qdisc add dev eth0 parent 1:1 handle 10: netem delay 25ms 5ms

PS:通过添加 5ms 抖动延迟，您还可以创建数据包重新排序在网络中.假设这就是您想要的.
PPS:我不确定添加抖动是否会导致重新排序在 OpenWRT 中.但它在 Linux 内核中确实如此.自 2010 年以来，Netem 经历了无数变化.
PPPS:为了引入无数据包重新排序的抖动，设置一个非常高的速率限制.
- PS: by adding 5ms jitter to delay, you also create packet reorderingin the network. Assuming that this is what you want.
- PPS: I am not sure whether adding jitter creates reordering or notin OpenWRT. But it surely does in the Linux kernel. Netem has undergone umpteen number of changes since 2010.
- PPPS: To introduce jitter w/o packet reordering, set a very highrate limit.
```
tc qdisc add dev eth0 parent 1:1 handle 10: rate 1000 mbit netem delay 25ms 5ms
```