#! /bin/sh
# Simple bandwidth limiter - <j@4u.net>

# 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