Analysis of the UDP protocol header

The UDP header analysis is from the source port and destination port on wikipedia, respectively, The UDP packet's departure port and destination port. Length is the Length of the UDP packet. The checksum algorithm is similar to the header checksum algorithm of the IP protocol. However, the checksum sequence of UDP includes the whole UDP packet and some information of the encapsulated IP header (mainly the outbound IP address and the destination IP address ). In this way, checksum can verify the correctness of IP: port. In IPv4, the checksum value can be 0, meaning that checksum is not used. IPv6 requires checksum verification.