Re: [ssm] Multicast SSM throughput in 802.11

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

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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
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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
> 
>  
> 
> 

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