[ssm] IPv6 Multicast Throughput problems in 802.11

"Tiago Sousa" <tmas@dei.uc.pt> Tue, 15 November 2005 02:26 UTC

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From: Tiago Sousa <tmas@dei.uc.pt>
To: ssm@ietf.org
Date: Tue, 15 Nov 2005 02:26:04 -0000
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Subject: [ssm] IPv6 Multicast Throughput problems in 802.11
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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.




Tiago Sousa


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