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NAT hairpinning, also known as NAT loopback or NAT reflection, [27] is a feature in many consumer routers [28] where a machine on the LAN is able to access another machine on the LAN via the external IP address of the LAN/router (with port forwarding set up on the router to direct requests to the appropriate machine on the LAN).
For example, an online computer game (which acts as a client) requires communication with a game server for exchanging gameplay data. In order to make it possible for a game server to provide data to its clients, those clients must be made accessible to the server. Usually, clients initiate connections to the game server to open communication ...
[citation needed] In Windows XP, NAT traversal is enabled by default, but in Windows XP with Service Pack 2 it has been disabled by default for the case when the VPN server is also behind a NAT device, because of a rare and controversial security issue. [6] IPsec NAT-T patches are also available for Windows 2000, Windows NT and Windows 98.
Session Traversal Utilities for NAT (STUN) is a standardized protocol for such address discovery including NAT classification. Traversal Using Relays around NAT (TURN) places a third-party server to relay messages between two clients when direct media traffic between peers is not allowed by a firewall.
Port forwarding via NAT router. In computer networking, port forwarding or port mapping is an application of network address translation (NAT) that redirects a communication request from one address and port number combination to another while the packets are traversing a network gateway, such as a router or firewall.
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The necessity to proxy every single port is a direct result of using NAT. As for the users being happy ... well as long as they stay good little consumers they may be, but many games nowadays need 'ports opened' and directed to the ONE PC that can play the game. Opening ports is a minor pain, "ONE PC" will make them very unhappy.
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