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On Amazon EC2, I cannot use multicast, but how about rackspace cloud? It would be very beneficial to be able to use multicast as most clustering protocols rely on it...

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Multicast isn't currently allowed on Rackspace Cloud Servers. The traffic volume of multicast traffic ends up overloading the switching layer and it degrades network performance for all traffic.

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OpSource cloud allows multicast. http://www.opsource.net/ Use this promo code ( CSPC01 ) for a $200 trial credit.

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If you could use multicast on the Rackspace cloud network, how would you ensure that only your clients were permitted to subscribe to the multicast group ?

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I would probably leave that for the Rackspace folks to worry about ;) – Kaitsu Mar 2 '10 at 11:43
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