NAT Traversal Protocol (Pia)
Yannik Marchand edited this page Nov 14, 2022
·
5 revisions
Pia Protocols > NAT Traversal
Up to Pia version 5.10, the protocol port was used to determine the message type.
| Protocol Port | Description |
|---|---|
| 1 | Probe request |
| 2 | Probe reply |
| 3 | Dummy packet |
In Pia version 5.11 and later, all packets are sent through port 0 and always contain the NatProbeData structure.
The following version numbers are advertised during the connection request:
| Pia version | Version |
|---|---|
| 5.19 - 5.43 | 0 |
| Offset | Size | Description |
|---|---|---|
| 0x0 | 16 | NatProbeData |
| Offset | Size | Description |
|---|---|---|
| 0x0 | 16 | NatProbeData |
| Offset | Size | Description |
|---|---|---|
| 0x0 | 5 | "Dummy" |
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Service variable id |
| 0x4 | 1 | Probe type (0=request 1=reply, 255=dummy) |
| 0x5 | 3 | Padding |
| 0x8 | 8 | System time (OSGetSystemTime on Wii U, nn::os::GetSystemTick on Switch) |
5.11 - 5.43:
| Offset | Size | Description |
|---|---|---|
| 0x10 | 4 | Variable id |
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