h1. Buffer Bloat

* http://bufferbloat.net

* http://queue.acm.org/detail.cfm?id=2071893

h2. QoS

* tc qdisc par IP source

http://lists.tetalab.org/pipermail/tetaneutral/2011-April/000129.html

* ebtable packet flow chart http://ebtables.sourceforge.net/br_fw_ia/PacketFlow.png

* tc openwrt theory http://wiki.openwrt.org/doc/howto/tc/tc.theory

* tc openwrt howto http://wiki.openwrt.org/doc/howto/tc

Partage de bande passante ADSL

<pre>

# Version du 20111207

function do_qos {

  tc qdisc add dev $DEV root handle 1: htb default 1

  tc class add dev $DEV parent 1: classid 1:1 htb rate $RATE

  for IP in $IP_LIST; do

    tc class add dev $DEV parent 1:1 classid 1:$IP htb rate 1kbit ceil $RATE

    tc filter add dev $DEV protocol ip parent 1:0 prio 1 u32 match ip $DIR 91.224.148.$IP flowid 1:$IP

  done

}

DIR=dst #on gw then RATE= ADSL download speed

#DIR=src #on local machine then RATE= ADSL upload speed

DEV=tapstg

RATE=11000kbit # src 700kbit

IP_LIST=$(seq 129 144)

do_qos

DEV=tapthd

RATE=5500kbit # src TODO

IP_LIST=$(seq 194 207)

do_qos

DEV=tapmon

RATE=480kbit # src 96kbit

IP_LIST=$(seq 114 115)

do_qos

</pre>

Pour supprimer un qdisc :

<pre>

tc qdisc del dev tapxxx root

</pre>

Pour afficher :

<pre>

tc -p -s -d qdisc show dev tapxxx

tc -p -s -d class show dev tapxxx

tc -p -s -d filter show dev tapxxx

</pre>