LARTC - Jan 2003 - In what order are CBQ and iptables applied?

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/

Masse, Tom wrote:
>
> 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?
>
Tom,

   it is not possible to do so, if I understand your question.  Take a 
look at http://www.netfilter.org/documentation to learn more about iptables.
> Also, when is CBQ applied?  Prerouting? Postrouting? Is it applied 
> pre- or post-routing specific to the interface, or to the kernel?
>
   I suggest that you take a look at http://www.docum.org as there is a 
good FAQ about traffic control.  You''ll find a diagram that shows where
traffic control applies.

Stephane
>
> *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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