Re: [LARTC] Question about how TC enforces bandwidth limiting

[Vadtec <vadtec@vadtec.net>]

David Boreham wrote:
>
>>
>>
>> I do have one question though. On the egress shaping on eth1 (LAN 
>> interface), when using iptables I should do everything in the 
>> POSTROUTING chain correct? That way it gets routed to the proper LAN 
>> node and still gets shaped, correct? If thats the case, I can have a 
>> setup working in no time (I hope).
> Well now it's my turn to be confused ! What's the connection between
> iptables and your traffic shaping setup ? Are you marking packets for
> shaping, something like that ? If so I have no idea. My routing and
> shaping are completely separate and unrelated in any way (I use
> tc filter to classify packets).
>
>
>
iptables (I forget what version onward supports this) has the ability to 
classify packets that it routes via -j CLASSIFY --set-class X:Y. For all 
intents and purposes, this is the same as -j MARK --set-mark X. 
Basically, it allows a user to use iptables to do the actual 
classification of the packet. For an example, take a look at: 
http://lartc.org/howto/lartc.cookbook.fullnat.intro.html, 
http://www.stanford.edu/~fenn/linux/ (this is the tutorial I base my 
iptables and tc rules on)

I am not familiar enough with tc filter syntax to brave it yet. Hence my 
use of iptables to classify packets, which I think is much easier anyways.

I was simply asking whether I would classify the packets in PREROUTING, 
OUTPUT, or POSTROUTING. I assume OUTPUT or POSTROUTING will let me 
achieve my goals with respect to egress on eth1. Guess it's time to 
enter my dark age of tc+iptables. :P

Sorry if I confused you with my question. It's the only way I know how 
to traffic shape (so far).

Vadtec
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