Peer NAT proxies for peer-to-peer games

Authors:
Daryl Seah;Wai Kay Leong;Qingwei Yang;Ben Leong;Ali Razeen
Affiliations:
National University of Singapore;National University of Singapore;National University of Singapore;National University of Singapore;National University of Singapore
Venue:
Proceedings of the 8th Annual Workshop on Network and Systems Support for Games
Year:
2009

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Abstract

Network Address Translators (NAT) are ubiquitous on the Internet and any peer-to-peer (p2p) game will almost certainly need to perform NAT traversal through such devices. Our experiments suggest that while NAT hole punching techniques are relatively mature, they succeed only about 90% of the time and thus p2p games will inevitably need to employ NAT proxies to establish the remaining connections. We demonstrate with an implementation and a measurement study that using peers as NAT proxies is feasible for both UDP and TCP connections. We found that it is relatively easy to find peers capable of acting as proxies and that the performance achieved is comparable to that of server-based NAT proxies.