Technical Tip: Change of NAT type for game console to play online
| Description | This article describes that the Nintendo Switch console supports NAT type A or B to play with other people online. |
| Scope | FortiGate. |
| Solution | Outgoing firewall policy with SNAT enabled gives either NAT C or NAT D type, but game consoles like the Nintendo Switch require NAT type A or type B to play with other people online.
Nintendo NAT types: Type A: The Switch can communicate online without any restrictions. Type B: The Switch can communicate online with minor restrictions. Type C: The Switch can communicate online with moderate restrictions Type D: The Switch can communicate online with moderate restrictions. NAT type D can communicate only with other units which are on NAT type A. Type F: Cannot communicate with anyone online.
Solution:
Enable Preserve Source Port on the firewall policy gives NAT type B.
Note: 'Preserve Source Port' is enabled by default from FortiOS 7.4.4 Onward. For more information, see Fine-tuning source port behavior for SNAT - FortiGate 7.4.0 new features. |
