Re: [ssm] IPv6 Multicast Throughput problems in 802.11

Toerless Eckert <eckert@cisco.com> Tue, 15 November 2005 15:17 UTC

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Date: Tue, 15 Nov 2005 07:16:55 -0800
From: Toerless Eckert <eckert@cisco.com>
To: Tiago Sousa <tmas@dei.uc.pt>
Subject: Re: [ssm] IPv6 Multicast Throughput problems in 802.11
Message-ID: <20051115151655.GL19539@cisco.com>
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What packet size do you use ?

There's also a configuratin on access-points for how much bandwidth
multicast (aka: broadcast) can use. That's often tuned down to a very low 
default value.

I've used successfully multiple megabits across 802.11b, not sure
what your problem is...

On Tue, Nov 15, 2005 at 02:26:04AM -0000, Tiago Sousa wrote:
> Hello to all
> 
>  
> 
> I am testing the PIM-SSM daemon (both freebsd and linux) and mrd6 (another
> IPv6 multicast routing daemon) 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 in the mobile node
> (which is very near from de access point) rounds 40 kbps.
> 
> I am using the mad-flute tool to send the multicast SSM traffic and the
> tcpdump plus trpr to analyze the data. I have also used IxChariot and the
> results are the same.
> 
>  
> 
> Anyone knows why the throughput decreases so much in the wireless link?
> (The multicast TTL is well defined, I have experimented with several
> pci/pcmcia cards and drivers and several access points configurations
> (different channels and rates (801.11b and 802.11g)). The results are remain
> always the same).
> 
>  
> 
> I would appreciate any help/hint that helps me to explain these results.
> 
>  
> 
> Thanks.
> 
>  
> 
> Tiago Sousa

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