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From: Andy Furniss <andy.furniss@dsl.pipex.com>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] Htb, imq and sfq traffic shaping
Date: Tue, 25 Jan 2005 12:23:06 +0000	[thread overview]
Message-ID: <41F63A2A.6090604@dsl.pipex.com> (raw)
In-Reply-To: <20050124150857.7d530d34@drak.aard.net>

Ixen Gerthannes wrote:
> Hello, I wrote a simple traffic shaping script (below) that should
> have allowed me to shape my internet traffic a bit (ppp0 - adsl
> 128kbit/64kbit; local interface eth0). The script works only
> partially - the speed is being limited but too much. Without running
> this script my download rate is about 10kBytes (with second computer
> also downloading at about 6kBytes). After running it my download
> speed decreases to about 1..2kBytes and so the second computer. Could
> you tell me what have I done wrong ?
> 
> Thank you for replies. Ixen
> 
> -------------- My configuration:


If you are shaping on and using PC1 and forwarding traffic for PC2 then 
you only need one IMQ.

You need to send all inbound on ppp0 to it in PREROUTING.

Shape egress directly on ppp0.

Traffic from the shaping PC will have ppp0s address not eth0s, you need 
to mark local addresses in postrouting mangle for the queues on ppp0.

IMQ needs to be set to hook after nat in prerouting. This may be the 
default AB?

To filter inbound local (denatted) ip addresses you can't mark with 
iptables you need to use tc filters. Remember traffic to/from the 
shaping PC over ppp0 will have ppp0s address.

You need to back off from 128/64 - maybe 100/50, it depends what you 
want to shape for. There are other tweaks if you really care about latency.

You need to sacrifice downstream bandwidth - and upstream unless you are 
prepared to find link overheads and tweak/patch.

Andy.

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  parent reply	other threads:[~2005-01-25 12:23 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-01-24 14:08 [LARTC] Htb, imq and sfq traffic shaping Ixen Gerthannes
2005-01-24 17:26 ` George Alexandru Dragoi
2005-01-25 12:23 ` Andy Furniss [this message]
2005-01-26 16:18 ` Andre Correa

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