Network Address Translation (NAT) is a fundamental part of how the internet works, enabling multiple devices to share a single public IP address. While often inconsequential, NAT type becomes critical for real-time applications like online gaming. Internet Protocol version 4 (IPv4) limitations necessitated NAT, though the newer IPv6 standard allows every device its own address, reducing the need for translation.
NAT types vary by platform: Xbox and PC use Open, Moderate, and Strict; PlayStation uses Type 1, 2, and 3; and Nintendo Switch uses A, B, C, and C. An Open type allows direct internet communication, while Strict types have blocked ports, limiting connectivity. In practice, Open NAT permits connections with any player, Moderate connects with Moderate or Open, and Strict only connects with Open players.
This affects matchmaking, with Strict players often unable to join friends or experiencing errors. While an Open NAT might seem ideal, it is impractical and insecure, as it would bypass router firewalls. The optimal setup typically involves someone with Open NAT acting as the game host.
For games using peer-to-peer connections, NAT type significantly impacts the player experience. Adjustments may be necessary if disconnection errors occur, but if matchmaking and voice chat function normally, no changes are required.
Source: Engadget · Summarized by HeadlinesBriefing