I don't have much experience with RAC. But I do know that RAC implements a technology Oracle is calling Cache Fusion whereby each instance's buffer cache can transmit blocks to the other buffer cache. This is typically done through the Interconnect between the nodes. However, it is possible in Linux to have the Interconnect be nothing more than dedicated NIC cards attached with a cross over cable. Since this is possible, I don't see a reason why you can just use your normal network as well. After all, you'll just be setting up IP numbers anyway.
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