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[ssm] IPv6 Multicast Throughput problems in 802.11



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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