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

[Stephane Ouellette <ouellettes@videotron.ca>]

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
>         RATEVKbit
>         WEIGHT=5Kbit
>         PRIO=5
>         RULE\x192.168.1.1/24:80
>         RULE\x192.168.1.1/24:8081
>         RULE\x192.168.1.1/24:8082
>         RULE\x192.168.1.1/24:8083
>         RULE\x192.168.1.1/24:8084
>         RULE\x192.168.1.1/24:8085
>
> 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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