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Due to the increased usage of NAT boxes and firewalls, it has become harder for applications to establish direct connections seamlessly among two end-hosts. A recently adopted proposal to mitigate this problem is to use relay nodes, end-hosts that act as intermediary points to bridge connections. Efficiently selecting a relay node is not a trivial problem, specially in a large-scale unstructured overlay system where end-hosts are heterogeneous. In such environment, heterogeneity among the relay nodes comes from the inherent differences in their capacities and from the way overlay networks are constructed.
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