UDP packet structure

Now we have to add port information to the UDP packet structure, which requires a new protocol. The simplest implementation is the UDP Protocol. Its format is almost in front of the data and the port number is added. A UDP packet is composed of two parts: "Header" and "data. The "Header" section mainly defines the sending and receiving ports, and the "data" section is the specific content. Then, put the entire UDP packet into the "data" part of the IP packet, and as mentioned earlier, the IP packet is placed in the Ethernet packet, so the entire Ethernet packet is now changed to the following: UDP data packets are very simple. The "Header" contains only 8 bytes in total, and the total length cannot exceed 65,535 bytes. It is placed into an IP data packet.