Important parts of a UDP packet:
- Time to Live (TTL) — How long a packet should live on the network before being discarded.
- Source port — A random (unused) port chosen by the sender.
- Destination port — The port on the receiving end, which normally is determined by the application being used.
- Source address — “From” IP address.
- Destination address — “To” IP address.
- Data — The, well, data.