What is Network Address Translation and Why Does It Appear in Games?
Network Address Translation (NAT) is one of the fundamental pillars that has kept the internet running for decades. This mechanism emerged to address the acute shortage of IPv4 address space, which provides only about four billion unique addresses—a number that was rapidly exhausted with the global proliferation of billions of smart devices. The technology works by assigning a single public internet address to the home network, while the router translates outgoing and incoming data traffic for all locally connected devices.
While this process poses no obstacle to browsing websites or streaming video, real-time applications such as multiplayer video games are severely affected by any delay or intermediary layers in the communication path, especially when exchanging direct data packets between players.
Classifications and Connection Modes Across Different Platforms
Gaming platforms use varying classifications to indicate the extent to which a device can freely communicate with game servers and other players over the internet:
- Open Mode (Open / Type 1 / A): Means the device connects directly to the internet without an intermediary or restrictions, which is an impractical and unsafe mode in homes because it eliminates the firewall protection provided by the router.
- Moderate Mode (Moderate / Type 2 / B): The ideal situation for most users, where the device sits behind a secure router but is able to open the necessary ports to communicate smoothly with the majority of players.
- Strict or Restricted Mode (Strict / Type 3 / C/D): Indicates that necessary ports are blocked, preventing the device from hosting sessions or joining other players who have the same mode, while increasing matchmaking errors.
It is worth noting that the connection mode does not change download speed or latency (Ping), but strictly determines the ability of devices to communicate with each other, and its effects clearly appear in games that rely on the peer-to-peer connection model and built-in voice chat.
Practical Steps to Improve Connection Mode and Resolve Issues
If games run without interruption and allow voice communication and fast searching, there is no need to change the settings. However, if alerts appear indicating that the mode is strict, the following guidelines can be followed to improve the network environment:
- Eliminating the Double NAT Issue: This problem occurs when connecting a personal router to the router or modem provided by the telecom company, creating two layers of address translation. This can be resolved by setting the provider's device to Bridge Mode, or running the secondary router strictly as an Access Point Mode.
- Choosing Between Automatic Connection Protocols and Port Forwarding: Enabling the Universal Plug and Play (UPnP) feature in the router allows devices to open ports automatically, which is an easy solution but carries security risks in the event of a network breach. Manual Port Forwarding for each device or game is a safer and preferred option to protect the home network.
- Addressing Carrier-Grade NAT Limitations: Some telecom companies apply translation technology at the central network level for the entire region. In this case, IPv6 can be enabled if the platform supports it to bypass the need for address translation, or by communicating directly with the service provider to request a dedicated public IP address.