Linux中最简单的总带宽限制

　　最简单的总带宽限制(tc脚本,每个主流linux都有tc和iptable,cp到一个文件赋予x权限,执行就ok)....根据pureftp的faq中带宽限制得来的...
　　#! /bin/sh
　　# Simple bandwidth limiter -
　　# Change this to your link bandwidth
　　# (for cable modem, DSL links, etc. put the maximal bandwidth you can
　　# get, not the speed of a local Ethernet link)
　　REAL_BW='10Mbit'
　　# Change this to the bandwidth you want to allocate to FTP.
　　# We're talking about megabits, not megabytes, so 80Kbit is
　　# 10 Kilobytes/s
　　FTP_BW='7200Kbit' //总带宽
　　# Change this to your physical network device (or 'ppp0')
　　NIC='eth0'
　　# Change this to the ports you assigned for passive FTP
　　FTP_PORT_LOW="10000" //passive端口低限
　　FTP_PORT_HIGH="11000" //passive端口上限
　　tc qdisc del dev "$NIC" root 2 /dev/null //清除tc队列中关于网卡的设置
　　//(hunreal修改)
　　tc qdisc add dev "$NIC" root handle 1: cbq bandwidth "$REAL_BW" avpkt 1000
　　tc class add dev "$NIC" parent 1: classid 1:1 cbq bandwidth "$REAL_BW" rate "$REAL_BW" maxburst 5 avpkt 1000
　　tc class add dev "$NIC" parent 1:1 classid 1:10 cbq bandwidth "$REAL_BW" rate "$FTP_BW" maxburst 5 avpkt 1000 bounded
　　tc qdisc add dev "$NIC" parent 1:10 sfq quantum 1514b
　　tc filter add dev "$NIC" parent 1: protocol ip handle 1 fw flowid 1:10
　　iptables -t mangle -A OUTPUT -p tcp --sport 20:1221 -j MARK --set-mark 1
　　//上面的1221是ftp的端口号
　　iptables -t mangle -A OUTPUT -p tcp --sport "$FTP_PORT_LOW":"$FTP_PORT_HIGH" -j MARK --set-mark 1