Re: [LARTC] Bandwidth throttling/limiting for all traffic

[Jason Boxman <jasonb@edseek.com>]

On Wednesday 17 November 2004 22:29, Darryl Cording wrote:
> Hi,
>
<snip>
> I am trying to build a Linux router that simply throttles everything
> down to certain bandwidths. That is, no priority queuing ...etc, just
> slow all traffic down to the specified rates, which are 64,128,256,512
> kbit. We want to setup the bandwidth on the router, then pump a known
> load from an application through the router and see how that behaves
> over various link speeds. (we are in a lab environment)

Using the htb qdisc with ceil equal to rate ought to accomplish this.

> Using kernel 2.6.5-1.358 I simply used these commands from Stef's
> version of tc from docum.org, module sch_htb is loaded.
>
> tc qdisc add dev eth0 root handle 10: htb
> tc class add dev eth0 parent 10: classid 10:1 htb rate 64kbit ceil 64kit

You need to classify your traffic.

tc qdisc add dev eth0 root handle 10: htb default 10
tc class add dev eth0 parent 10: classid 10:1 htb rate 64kbit ceil 64kit

If you add the default parameter, htb will put any unclassified into classid 
10:1.

> I thought that would do the job, but my testing from uploading files via
> ftp to another box, show nothing gets shaped.

Right, because it wasn't classified.

-- 

Jason Boxman
Perl Programmer / *NIX Systems Administrator
Shimberg Center for Affordable Housing | University of Florida
http://edseek.com/ - Linux and FOSS stuff

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