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UDP_HOLE_PUNCH_PACKET_FLOW.md

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Port Lookup

Client refers to the client performing a port lookup. Server refers to the World Host server.

  1. Client asks Server to begin port lookup with a randomly generated UUID.
  2. Client sends Server UUID over UDP signaling channel (retransmitted every 3 ticks).
  3. If Server doesn't receive the UUID within 10 seconds, it drops the request.
  4. Server sends Client identified IP and outer port.

Hole Punching

Client A refers to the client hosting the world. Client B refers to the connecting client. Server refers to the World Host server.

  1. Client B performs Port Lookup to receive an open outer port.
  2. Client B asks Server for Client A to open a port for a specified purpose. A unique UUID, the IP, and the outer port are included.
  3. Server passes the request to Client A.
  4. Client A verifies the request comes from a valid party.
  5. If verification is successful, Client A performs Port Lookup and sends an empty packet to Client B's port until Port Lookup finishes.
  6. Client A asks Server to send Client B its IP and port.