מין ווריאציה על הנושא....
https://www.bungie.net/en/Help/Article/11931
Q: What are the differences between NAT types?
Open or Type 1 NAT – Nothing is getting between you and your connection to Destiny. You get the best experience using voice chat, joining games, and matchmaking with players.
Note: Open or Type 1 NAT may not be possible in many configurations, especially if you don’t control all of the hardware between you and your internet access.
Moderate or Type 2 NAT – This is the most common configuration. You may experience longer matchmaking times, issues with voice chat, or other problems.
Strict or Type 3 NAT – Strict or Type 3 NATs often indicate your console network settings are restrictive. With Strict/Type 3 NAT types, we have a harder time giving you the best possible experience, including voice chat with all players in your Fireteam. A Strict NAT or Type 3 NAT is not recommended and may cause noticeable problems.
 
או לפעמים - strict, moderate and open
http://serverfault.com/questions/208522/what-is-strict-moderate-and-open-nat