Zhenlong Cui

NAT Traversal Technology of Reducing Load on Relaying Server for P2P Connections

This paper proposes a novel Network Address Translator (NAT) traversal technology to create Peer-to-Peer (P2P) connections through NAT devices, enabling load on the relaying server to be remarkably reduced. The conventional NAT traversal technologies can inflict heavy load on the relaying server because they cannot be applied to NAT devices which randomly assign the port number. In addition, such technologies can overload the relaying server because it must exchange packets with terminals to estimate NAT devices IP address/port number. Our technology estimates the IP address/port number without the relaying server based on a payload checksum of an ICMP message sent back after an investigating packet is transmitted toward a desired peer. Our technology can create P2P connections without inflicting load on the relaying server even in the case where NAT devices randomly assign the port number because it can exactly estimate the assigned port number with only terminal-side processing. This paper clarifies that our technology can reduce more than 80% of the load on the relaying server as compared with the conventional technologies.