LARTC - Jul 2006 - skype specific QoS - assigning skype traffic to an HTB class

Hi,

What do you think about this solution for skype specific QoS:

	function HTB_shape
	{
	###########################################################
	# Shapes the traffic of an interface, limiting the late
	#
	# Arguments are DEV,RATE


	DEV=$1
	RATE=$2

	[...]

	PORT=dport
	if [ $DEV == $EXTIF ]; then
		PORT=sport
	fi

	iptables -t mangle -A MYSHAPER-$DEV -p tcp --$PORT 4000 -j MARK --set-mark 22
	# skype configured to listen on 4000
	iptables -t mangle -A MYSHAPER-$DEV -p udp --$PORT 4000 -j MARK --set-mark 22

	[...]

	}

	[...]

	HTB_shape $INTIF $RATEDN
	HTB_shape $EXTIF $RATEUP

?

According to

http://www.skype.com/help/faq/technical.html

we can choose the port that skype will use for sending and receiving traffic. 
For this example port  4000 was chosen, and that port is forwarded from the 
linux router to the internal machine that runs skype for both TCP and UDP 
traffic.

The idea is that since we''re shapping on the output of each interface,
for the
external interface we want to filter on the source port whereas for the 
internal one what matters is the destination port.

The complete script is here:

http://downloads.angulosolido.pt/QoS/HTB_shaper.sh

Comments?

Best regards
Gustavo

-- 
 Angulo Sólido - Tecnologias de Informação
http://angulosolido.pt