#!/bin/bash
DEV="eth1" # interface to limit

case $1 in
start)
echo "Starting bandwidth limiter..."
tc qdisc add dev $DEV root handle 1: htb
tc class add dev $DEV parent 1: classid 1:1 htb rate 100Mbit # interface speed
tc class add dev $DEV parent 1:1 classid 1:10 htb rate 160Kbit # limit speed
tc qdisc add dev $DEV parent 1:10 handle 10: sfq perturb 10

# you can match ports like this if you want...why?
#tc filter add dev $DEV protocol ip parent 1:0 prio 1 u32 match ip sport 2234 0xffff flowid 1:10

# This catches mark. Use if your IPTables doesn't support classify. Set with
# -j MARK --set-mark 10
#tc filter add dev $DEV parent 1: protocol ip handle 10 fw flowid 1:10

# For a nat setup with slsk ports forwarded to another box this will work.
#iptables -t mangle -A FORWARD -p tcp --sport 2234:2239 -j CLASSIFY --set-class 1:10

# To run this on the same box as museekd, this will do the trick.
iptables -t mangle -A POSTROUTING -p tcp --sport 2234:2239 -j CLASSIFY --set-class 1:10
;;
stop)
echo "Stopping bandwidth limiter..."
tc qdisc del dev $DEV root 2>&1 >/dev/null
# I just wipe the entire mangle table as this is the only stuff I have in it.
# You may want to change this if you use the mangle table elsewhere.
iptables -F -t mangle
iptables -X -t mangle
;;
restart)
$0 stop
$0 start
;;
status)
echo "[iptables - $DEV]"
iptables -t mangle -L
echo "------------------------"
echo
echo "[qdisc - $DEV]"
tc -s qdisc show dev $DEV
echo "------------------------"
echo
echo "[class - $DEV]"
tc -s class show dev $DEV
;;
filter)
echo "[filter - $DEV]"
tc -s filter show dev $DEV
;;
*)
echo 'Usage: {start|stop|restart|status}'
;;
esac