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UDP hole punching is a method for establishing bidirectional UDP connections between Internet hosts in private networks using network address translators. The technique is not applicable in all scenarios or with all types of NATs, as NAT operating characteristics are not standardized.
To punch a hole, each client connects to an unrestricted third-party server that temporarily stores external and internal address and port information for each client. The server then relays each client's information to the other, and using that information each client tries to establish direct connection; as a result of the connections using ...
Session Traversal Utilities for NAT (STUN) is a standardized set of methods and a network protocol for NAT hole punching. It was designed for UDP but was also extended to TCP. Traversal Using Relays around NAT (TURN) is a relay protocol designed specifically for NAT traversal.
In this way, UDP provides application multiplexing. A port is a software structure that is identified by the port number , a 16-bit integer value, allowing for port numbers between 0 and 65535. Port 0 is reserved but is a permissible source port value if the sending process does not expect messages in response.
UDT4 (2007) introduced several new features to better support high concurrency and firewall traversing. UDT4 allowed multiple UDT connections to bind to the same UDP port and it also supported rendezvous connection setup for easier UDP hole punching. A fifth version of the protocol is currently in the planning stage.
ICMP hole punching is a technique employed in network address translator (NAT) applications for maintaining Internet Control Message Protocol (ICMP) packet streams that traverse the NAT. NAT traversal techniques are typically required for client-to-client networking applications on the Internet involving hosts connected in private networks ...
A growing number of skiers, weary of high prices and long lift lines at crowded resorts, are turning to the solitude of backcountry slopes. But the avalanche dangers are real, and skiers should go ...
TCP hole punching is an experimentally used NAT traversal technique for establishing a TCP connection between two peers on the Internet behind NAT devices. NAT traversal is a general term for techniques that establish and maintain TCP/IP network and/or TCP connections traversing NAT gateways.