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Nodes in the grid can be connected through a multigigabit network. However, the network interfaces in the nodes can become a bottleneck for the maximum achievable bandwidth among nodes. We propose an extensible communication architecture to avoid the limitations of the network interfaces by integrating multiple network interfaces in each node. The proposed solution deploys a technique to balance the network traffic load among multiple network interfaces in a single node. While this technique enhances communication bandwidth among the nodes, it is distributed and does not require any coordination or reservation mechanisms. It achieves the maximum possible bandwidth between any pair of grid nodes with multiple network interfaces. The experimental evaluation provided good results and demonstrated the benefits of the proposed architecture.