iptables+TC进行流量控制 下面是我们一个子公司的一个linux网关的Qos设置，利用iptables和TC，感觉效果很好的。
实例1：
流量控制：
防火墙上eth0连接内网，eth1连接外网线路，带宽为2.5M，目标：
1、内网用户下载占用的带宽最多为1000kbit/s 而192.168.37.167主192.168.37.168下载带宽可达到1.5Mbit/s
2、内网中的192.168.37.124和192.168.37.140的上传占用的带宽最多为1.5M，而其它用户最多为150Kbit/s
（这样的流量控制后，内网中即使有人使用bt之类的软件也不怕。因为他的上传最多只能占用150Kbit/s，下载最多1000kbit/s ^-^）
#!/bin/sh
TC="/sbin/tc"
LAN_IFACE="eth0"
INET_IFACE="eth1"
ERP1="192.168.37.167/32"
ERP2="192.168.37.168/32"
INTERNAL_LAN="192.168.37.0/24"
start(){
#################### Qos rule on eth0 ########################
#$TC qdisc add dev eth1 root tbf rate 512kbit lantency 50ms burst 1540
if [ "$LAN_IFACE" != "" ];then
$TC qdisc add dev $LAN_IFACE root handle 1:0 cbq bandwidth 100Mbit avpkt 1000 cell 8
$TC
class add dev $LAN_IFACE parent 1:0 classid 1:1 cbq bandwidth 100Mbit
rate 2.5Mbit weight 3Mbit prio 8 allot 1514 cell 8 maxburst 20 avpkt
1000 bounded
$TC
class add dev $LAN_IFACE parent 1:1 classid 1:2 cbq bandwidth 100Mbit
rate 1500kbit weight 2Mbit prio 6 allot 1514 cell 8 maxburst 20 avpkt
1000
$TC
class add dev $LAN_IFACE parent 1:1 classid 1:3 cbq bandwidth 100Mbit
rate 1000kbit weight 1Mbit prio 7 allot 1514 cell 8 maxburst 20 avpkt
1000 bounded
$TC qdisc add dev $LAN_IFACE parent 1:2 handle 20: sfq
$TC qdisc add dev $LAN_IFACE parent 1:3 handle 30: sfq
$TC filter add dev $LAN_IFACE parent 1:0 protocol ip prio 2 u32 match ip dst $ERP1 flowid 1:2
$TC filter add dev $LAN_IFACE parent 1:0 protocol ip prio 2 u32 match ip dst $ERP2 flowid 1:2
$TC filter add dev $LAN_IFACE parent 1:0 protocol ip prio 4 u32 match ip dst $INTERNAL_LAN flowid 1:3
echo ""
echo ""
echo "qos rule on eth0 start ...........ok!"
echo ""
echo ""
fi
#################### Qos rule on eth1 ########################
if [ "$INET_IFACE" != "" ];then
iptables -F -t mangle
iptables -X -t mangle
iptables -Z -t mangle
iptables -A PREROUTING -t mangle -s $ERP1 -j MARK --set-mark 1
iptables -A PREROUTING -t mangle -s $ERP2 -j MARK --set-mark 1
iptables -A PREROUTING -t mangle -s 192.168.37.124/32 -j MARK --set-mark 1
iptables -A PREROUTING -t mangle -s 192.168.37.140/32 -j MARK --set-mark 1
iptables -I PREROUTING -t mangle -s $INTERNAL_LAN -j MARK --set-mark 2
$TC qdisc add dev $INET_IFACE root handle 2:0 cbq bandwidth 100Mbit avpkt 1000 cell 8
$TC
class add dev $INET_IFACE parent 2:0 classid 2:1 cbq bandwidth 100Mbit
rate 2Mbit weight 1Mbit prio 8 allot 1514 cell 8 maxburst 20 avpkt 1000
bounded
$TC
class add dev $INET_IFACE parent 2:1 classid 2:2 cbq bandwidth 100Mbit
rate 1500kbit weight 150kbit prio 6 allot 1514 cell 8 maxburst 20 avpkt
1000
$TC
class add dev $INET_IFACE parent 2:1 classid 2:3 cbq bandwidth 100Mbit
rate 150kbit weight 20kbit prio 7 allot 1514 cell 8 maxburst 20 avpkt
1000 bounded
$TC qdisc add dev $INET_IFACE parent 2:2 handle 20: sfq
$TC qdisc add dev $INET_IFACE parent 2:3 handle 30: sfq
$TC filter add dev $INET_IFACE parent 2:0 protocol ip prio 1 handle 1 fw classid 2:2
$TC filter add dev $INET_IFACE parent 2:0 protocol ip prio 2 handle 2 fw classid 2:3
echo ""
echo ""
echo "qos rule on eth1 start ...........ok!"
echo ""
echo ""
fi
}
stop(){
if [ "$LAN_IFACE" != "" ];then
$TC qdisc del dev $LAN_IFACE root
fi
if [ "$INET_IFACE" != "" ];then
$TC qdisc del dev $INET_IFACE root
fi
iptables -F -t mangle
iptables -X -t mangle
iptables -Z -t mangle
}
status(){
echo "show qdisc ............ "
echo ""
echo ""
echo ""
$TC -d -s qdisc
echo ""
echo ""
echo "show filter ............ "
echo ""
echo ""
if [ "$LAN_IFACE" != "" ];then
$TC -d -s filter ls dev $LAN_IFACE
fi
echo ""
echo ""
if [ "$INET_IFACE" != "" ];then
$TC -d -s filter ls dev $INET_IFACE
fi
echo ""
echo ""
echo "show class ............ "
echo ""
echo ""
if [ "$LAN_IFACE" != "" ];then
$TC -d -s class ls dev $LAN_IFACE
fi
echo ""
echo ""
if [ "$INET_IFACE" != "" ];then
$TC -d -s class ls dev $INET_IFACE
fi
echo ""
echo ""
}
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
status)
status
;;
*)
echo $"Usage:$0 {start|stop|restart|status}"
exit 1
esac
