ADSL Bandwidth Management HOWTO by Dan Singletary (best sci fi novels of all time .TXT) 📖

iptables -t mangle -A MYSHAPER-OUT -p udp -j MARK --set-mark 21 # DNS name resolution (small packets)

iptables -t mangle -A MYSHAPER-OUT -p tcp --dport ssh -j MARK --set-mark 22 # secure shell

iptables -t mangle -A MYSHAPER-OUT -p tcp --sport ssh -j MARK --set-mark 22 # secure shell

iptables -t mangle -A MYSHAPER-OUT -p tcp --dport telnet -j MARK --set-mark 22 # telnet (ew...)

iptables -t mangle -A MYSHAPER-OUT -p tcp --sport telnet -j MARK --set-mark 22 # telnet (ew...)

iptables -t mangle -A MYSHAPER-OUT -p ipv6-crypt -j MARK --set-mark 24 # IPSec - we don't know what the payload is though...

iptables -t mangle -A MYSHAPER-OUT -p tcp --sport http -j MARK --set-mark 25 # Local web server

iptables -t mangle -A MYSHAPER-OUT -p tcp -m length --length :64 -j MARK --set-mark 21 # small packets (probably just ACKs)

iptables -t mangle -A MYSHAPER-OUT -m mark --mark 0 -j MARK --set-mark 26 # redundant- mark any unmarked packets as 26 (low prio)

Done with outbound shaping ##############################################

echo "Outbound shaping added to $DEV. Rate: ${RATEUP}Kbit/sec."

uncomment following line if you only want upstream shaping. exit ############################################## Inbound Shaping (limits total bandwidth to RATEDN) make sure imq module is loaded

modprobe imq numdevs=1

ip link set imq0 up

add qdisc - default low-prio class 1:21

tc qdisc add dev imq0 handle 1: root htb default 21

add main rate limit classes

tc class add dev imq0 parent 1: classid 1:1 htb rate ${RATEDN}kbit

add leaf classes - TCP traffic in 21, non TCP traffic in 20

tc class add dev imq0 parent 1:1 classid 1:20 htb rate $[$RATEDN/2]kbit ceil ${RATEDN}kbit prio 0

tc class add dev imq0 parent 1:1 classid 1:21 htb rate $[$RATEDN/2]kbit ceil ${RATEDN}kbit prio 1

attach qdisc to leaf classes - here we at SFQ to each priority class. SFQ insures that within each class connections will be treated (almost) fairly.

tc qdisc add dev imq0 parent 1:20 handle 20: sfq perturb 10

tc qdisc add dev imq0 parent 1:21 handle 21: red limit 1000000 min 5000 max 100000 avpkt 1000 burst 50

filter traffic into classes by fwmark - here we direct traffic into priority class according to the fwmark set on the packet (we set fwmark with iptables later). Note that above we've set the default priority class to 1:26 so unmarked packets (or packets marked with unfamiliar IDs) will be defaulted to the lowest priority class.

tc filter add dev imq0 parent 1:0 prio 0 protocol ip handle 20 fw flowid 1:20

tc filter add dev imq0 parent 1:0 prio 0 protocol ip handle 21 fw flowid 1:21

add MYSHAPER-IN chain to the mangle table in iptables - this sets up the table we'll use to filter and mark packets.

iptables -t mangle -N MYSHAPER-IN

iptables -t mangle -I PREROUTING -i $DEV -j MYSHAPER-IN

add fwmark entries to classify different types of traffic - Set fwmark from 20-26 according to desired class. 20 is highest prio.

iptables -t mangle -A MYSHAPER-IN -p ! tcp -j MARK --set-mark 20 # Set non-tcp packets to highest priority

iptables -t mangle -A MYSHAPER-IN -p tcp -m length --length :64 -j MARK --set-mark 20 # short TCP packets are probably ACKs

iptables -t mangle -A MYSHAPER-IN -p tcp --dport ssh -j MARK