#!/bin/sh

# start configuration
# In reality, my ISP gives me a link with 2,5 Mbit/s UP and 30Mbit/s DOWN.
# You have to set the below values at least 10% smaller then what your ISP
# gives you. 
UPLINK=2048
DOWNLINK=25600

# This is the maximum bandwindth that can be used by the low prio traffic.
UPLINKLESS=1800

TC=/usr/sbin/tc #-------- location of traffic control
IPT=/usr/sbin/iptables #- location of iptables
DEV=eth1

# stop configuration

insmod sch_htb
insmod sch_sfq
insmod sch_ingress
insmod act_police
insmod cls_u32

#delete everything
$TC qdisc del dev $DEV root

$TC qdisc del dev $DEV ingress

# install root HTB, point default traffic to 1:20:

$TC qdisc add dev $DEV root handle 1: htb default 20

# shape everything at $UPLINK speed - this prevents huge queues in your
# DSL modem which destroy latency:

$TC class add dev $DEV parent 1: classid 1:1 htb rate ${UPLINK}kbit burst 6k

# high prio class 1:10:

$TC class add dev $DEV parent 1:1 classid 1:10 htb rate ${UPLINK}kbit \
   burst 6k prio 1

# bulk & default class 1:20 - gets slightly less traffic, 
# and a lower priority:

$TC class add dev $DEV parent 1:1 classid 1:20 htb rate ${UPLINKLESS}kbit \
   burst 6k prio 2

# both get Stochastic Fairness:
$TC qdisc add dev $DEV parent 1:10 handle 10: sfq perturb 10
$TC qdisc add dev $DEV parent 1:20 handle 20: sfq perturb 10

# traffic generated by Siemens (VOIP)
$TC filter add dev $DEV parent 1:0 protocol ip prio 10 u32 \
      match ip tos 0x88 0xff  flowid 1:10

# ICMP (ip protocol 1) in the interactive class 1:10 so we 
# can do measurements & impress our friends:
$TC filter add dev $DEV parent 1:0 protocol ip prio 10 u32 \
	match ip protocol 1 0xff flowid 1:10

# To speed up downloads while an upload is going on, put ACK packets in
# the interactive class:

$TC filter add dev $DEV parent 1: protocol ip prio 10 u32 \
   match ip protocol 6 0xff \
   match u8 0x05 0x0f at 0 \
   match u16 0x0000 0xffc0 at 2 \
   match u8 0x10 0xff at 33 \
   flowid 1:10

########## downlink #############
# slow downloads down to somewhat less than the real speed  to prevent 
# queuing at our ISP. Tune to see how high you can set it.
# ISPs tend to have *huge* queues to make sure big downloads are fast
#
# attach ingress policer:

$TC qdisc add dev $DEV handle ffff: ingress

# filter *everything* to it (0.0.0.0/0), drop everything that's
# coming in too fast:

$TC filter add dev $DEV parent ffff: protocol ip prio 50 u32 match ip src \
   0.0.0.0/0 police rate ${DOWNLINK}kbit burst 40k drop flowid :1