[LARTC] In what order are CBQ and iptables applied?

["Masse, Tom" <TMasse@gomez.com>]

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Let's say I have two Ethernet interfaces (eth0 and eth1).  I am trying to
shape multiple TCP connections to 56K from one 100MBit pipe.

CLIENT  ----------  ETH0  --------  ETH1  ----------  SERVER
192.168.1.1     192.168.1.254   172.16.1.254      172.16.1.1

For example, I want the client to be able to make multiple TCP connections
(.1.1:80, .1.1:8081, .1.1:8082) all at 56K from the server, which obviously
has the ability to deliver 100MBit.

My CBQ file looks like so:
	DEVICE=eth0,100MBit,10Mbit
	RATE=56Kbit
	WEIGHT=5Kbit
	PRIO=5
	RULE=192.168.1.1/24:80
	RULE=192.168.1.1/24:8081
	RULE=192.168.1.1/24:8082
	RULE=192.168.1.1/24:8083
	RULE=192.168.1.1/24:8084
	RULE=192.168.1.1/24:8085

Is it possible to use iptables to make all the connections' destination
ports appear to be port 80?  How, and to which interface, should I apply the
rules?

Also, when is CBQ applied?  Prerouting? Postrouting? Is it applied pre- or
post-routing specific to the interface, or to the kernel?


Tom Masse
Engineer, Network Operations
Gómez, Inc.

T 781.768.2134
F 781.466.1434

Maximize Your Internet Channel Effectiveness 
http://www.gomez.com/


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