Re: [ssm] Multicast SSM throughput in 802.11

Matthias Waehlisch <mw@fhtw-berlin.de> Thu, 20 October 2005 07:19 UTC

Received: from localhost.localdomain ([127.0.0.1] helo=megatron.ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1ESUiU-0000iT-Kd; Thu, 20 Oct 2005 03:19:58 -0400
Received: from odin.ietf.org ([132.151.1.176] helo=ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1ESUiS-0000iL-SB for ssm@megatron.ietf.org; Thu, 20 Oct 2005 03:19:56 -0400
Received: from ietf-mx.ietf.org (ietf-mx [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id DAA20466 for <ssm@ietf.org>; Thu, 20 Oct 2005 03:19:46 -0400 (EDT)
Received: from mail1.rz.fhtw-berlin.de ([141.45.5.103]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1ESUuL-0004yv-6n for ssm@ietf.org; Thu, 20 Oct 2005 03:32:14 -0400
Received: from e178111158.adsl.alicedsl.de ([85.178.111.158] helo=rz-thinkpad02) by mail1.rz.fhtw-berlin.de with esmtpsa (TLSv1:RC4-MD5:128) (Exim 4.42 (FreeBSD)) id 1ESUiG-000Ks6-Ma; Thu, 20 Oct 2005 09:19:44 +0200
Date: Thu, 20 Oct 2005 09:19:53 +0200
From: Matthias Waehlisch <mw@fhtw-berlin.de>
To: Tiago Sousa <tmas@dei.uc.pt>
Subject: Re: [ssm] Multicast SSM throughput in 802.11
In-Reply-To: <200510200137.j9K1b3su027487@smtp.dei.uc.pt>
Message-ID: <Pine.WNT.4.62.0510200919330.2696@rz-thinkpad02>
References: <200510200137.j9K1b3su027487@smtp.dei.uc.pt>
X-X-Sender: mw@mail1.rz.fhtw-berlin.de
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Spam-Score: 0.0 (/)
X-Scan-Signature: 4adaf050708fb13be3316a9eee889caa
Cc: ssm@ietf.org
X-BeenThere: ssm@ietf.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Source-Specific Multicast <ssm.ietf.org>
List-Unsubscribe: <https://www1.ietf.org/mailman/listinfo/ssm>, <mailto:ssm-request@ietf.org?subject=unsubscribe>
List-Post: <mailto:ssm@ietf.org>
List-Help: <mailto:ssm-request@ietf.org?subject=help>
List-Subscribe: <https://www1.ietf.org/mailman/listinfo/ssm>, <mailto:ssm-request@ietf.org?subject=subscribe>
Sender: ssm-bounces@ietf.org
Errors-To: ssm-bounces@ietf.org

Hi Tiago,

  at some access points you can configure rate limiting/a threshold for 
multicast. Because the wlan cell is a shared segment, you have no chance 
to use IGMP snooping, but you want to suppress a 'complete bandwidth 
allocation' by the use of multicast.


regards
  matthias

On Thu, 20 Oct 2005, Tiago Sousa wrote:

> Hello
> 
>  
> 
> I am testing the PIM-SSM daemon (both freebsd and linux) and mrd6 program in
> a wireless link. 
> 
> The problem I encountered, with both pim6sd daemon and mrd6, is that I'm
> sending multicast traffic at 4 Mbps and the throughput reaches the mobile
> node (which is very near from de access point) rounding 40 kbps.
> 
> I am using the mad-flute tool to send the multicast SSM traffic and the
> tcpdump plus trpr to analyze the data.
> 
>  
> 
> Anyone knows why the throughput decreases so much in the wireless link? 
> 
>  
> 
> I would appreciate any help/hint that helps me to explain these results.
> 
>  
> 
> Thanks.
> 
>  
> 
> Tiago Sousa
> 
>  
> 
> 

_______________________________________________
ssm mailing list
ssm@ietf.org
https://www1.ietf.org/mailman/listinfo/ssm