: Often tests if Universal Plug and Play (UPnP) or NAT Port Mapping Protocol (NAT-PMP) are correctly opening ports. Why It Matters for Gaming
: Maps a unique external port for every unique destination, making it the most restrictive for gaming. Nat.7z
: Allows all incoming traffic from any external host to a mapped internal port. : Often tests if Universal Plug and Play
: Players with "Open" NAT can host games and connect to any other player. : Players with "Open" NAT can host games
: Uses STUN (Session Traversal Utilities for NAT) servers to discover the public IP address and port mapping assigned by your router.
: Only allows traffic from external hosts the internal user has previously contacted.
Gamers often seek out this specific tool when they encounter "Strict NAT" errors in games or voice chat services.