转自：http://www.360doc.com/content/11/0425/12/2054285_112165356.shtml
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’
–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’
–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]