QoS Linux

1. !/bin/sh

TCOP="add"
IPTOP="-A"

if [ "$1" == "stop" ]; then
echo "Stopping..."
TCOP="del"
IPTOP="-D"
fi

1. +---------+
2. | root 1: |
3. +---------+
4. |
5. +----------------------------+
6. | class 1:1 |
7. +----------------------------+
8. | | |
9. +----+ +----+ +----+
10. |1:10| |1:20| |1:30|
11. +----+ +----+ +----+
12. |
13. +--------+--------+
14. | | |
15. +-----+ +-----+ +-----+
16. |1:100| |1:101| |1:102|
17. +-----+ +-----+ +-----+

1. 1:10 is the class for VOIP traffic, pfifo qdisc
2. 1:20 is for bulk traffic (htb, leaves use sfq)
3. 1:30 is the class that interactive and TCP SYN/ACK traffic (sfq qdisc)

1. 1:20 is further split up into different kinds of bulk traffic: web, mail and
2. everything else. 1:100-102 fight amongst themselves for their slice of excess
3. bandwidth, and in turn 1:10,20 and 30 then fight for any excess above their
4. minimum rates.

1. which interface to throw all this on (DSL)

IF=eth2

1. ceil is 75% of max rate (768kbps)
2. rate is 65% of max rate
3. we don't let it go to 100% because we don't want the DSL modem (Pairgain MegaBit Modem 300S)
4. to have a ton of packets in their buffers. *we* want to do the buffering.

RATE=576
CEIL=640

1. RATE=450
2. CEIL=500

tc qdisc ${TCOP} dev ${IF} root handle 1: htb default 102
tc class ${TCOP} dev ${IF} parent 1: classid 1:1 htb rate ${RATE}kbit ceil ${CEIL}kbit

tc class ${TCOP} dev ${IF} parent 1:1 classid 1:10 htb rate 64kbit ceil ${RATE}kbit prio 1
tc class ${TCOP} dev ${IF} parent 1:1 classid 1:20 htb rate 64kbit ceil ${RATE}kbit prio 2

tc class ${TCOP} dev ${IF} parent 1:20 classid 1:100 htb rate ${RATE}kbit
tc class ${TCOP} dev ${IF} parent 1:20 classid 1:101 htb rate ${RATE}kbit
tc class ${TCOP} dev ${IF} parent 1:20 classid 1:102 htb rate ${RATE}kbit

tc qdisc ${TCOP} dev ${IF} parent 1:10 handle 10: pfifo
tc qdisc ${TCOP} dev ${IF} parent 1:100 handle 100: sfq perturb 10
tc qdisc ${TCOP} dev ${IF} parent 1:101 handle 101: sfq perturb 10
tc qdisc ${TCOP} dev ${IF} parent 1:102 handle 102: sfq perturb 10

tc filter ${TCOP} dev ${IF} parent 1:0 protocol ip prio 1 handle 1 fw classid 1:10
tc filter ${TCOP} dev ${IF} parent 1:0 protocol ip prio 4 handle 4 fw classid 1:100

1. IAX2 prio 0.

iptables -t mangle ${IPTOP} PREROUTING -p udp -m udp --dport 4569 -j MARK --set-mark 0x1
iptables -t mangle ${IPTOP} PREROUTING -p udp -m udp --dport 4569 -j RETURN

1. everything else goes into lowest priority (best effort).

iptables -t mangle ${IPTOP} PREROUTING -j MARK --set-mark 0x4
iptables -t mangle ${IPTOP} OUTPUT -j MARK --set-mark 0x4