[文章作者:张宴 本文版本:v1.0 最后修改:2008.11.20 转载请注明原文链接:http://blog.zyan.cc/post/380/]

  Linux下限制网卡的带宽,可用来模拟服务器带宽耗尽,从而测试服务器在此时的访问效果。

  1、安装iproute
yum -y install iproute


  2、限制eth0网卡的带宽为50kbit:
/sbin/tc qdisc add dev eth0 root tbf rate 50kbit latency 50ms burst 1000


  3、限制带宽为50kbit后,在百兆局域网中wget下载一个大文件:
[root@localhost ~]# wget http://192.168.1.7/test.zip
--19:40:27--  http://192.168.1.7/test.zip
Connecting to 192.168.1.7:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 23862312 (23M) [application/zip]
Saving to: `test.zip'

37% [=======>   ] 8,994,816    457K/s  eta 27s

  下载速度为457K/s,限制效果达到。

  4、解除eth0网卡的带宽限制:
/sbin/tc qdisc del dev eth0 root tbf


  5、对比:未作带宽限制情况下,在百兆局域网中wget下载一个大文件:
[root@localhost ~]# wget http://192.168.1.7/test.zip    
--19:44:33--  http://192.168.1.7/test.zip
Connecting to 192.168.1.7:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 23862312 (23M) [application/zip]
Saving to: `test.zip'

100%[==========>] 23,862,312  6.14M/s   in 3.7s  

19:44:36 (6.16 MB/s) - `test.zip' saved [23862312/23862312]

  下载速度为6.16MB/s。



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