This User Datagram Protocol (UDP) is defined to make available a datagram mode of packet-switched computer communication in the environment of an interconnected set of computer networks. This protocol assumes that the Internet Protocol (IP)  is used as the underlying protocol.
This protocol provides a procedure for application programs to send messages to other programs with a minimum of protocol mechanism. The protocol is transaction oriented, and delivery and duplicate protection are not guaranteed. Applications requiring ordered reliable delivery of streams of data should use the Transmission Control Protocol (TCP) .
|Field name||Field type||Field size||Field description|
|source_port||Integer||16||Source Port is an optional field, when meaningful, it indicates the port of the sending process, and may be assumed to be the port to which a reply should be addressed in the absence of any other information. If not used, a value of zero is inserted.|
|destination_port||Integer||16||Destination Port has a meaning within the context of a particular internet destination address.|
|length||Integer||16||Length is the length in octets of this user datagram including this header and the data. (This means the minimum value of the length is eight.)|
|checksum||Integer||16||Checksum is the 16-bit one's complement of the one's complement sum of a pseudo header of information from the IP header, the UDP header, and the data, padded with zero octets at the end (if necessary) to make a multiple of two octets.|
|payload||Binary Large Object||-||(This is the payload. It is (length - 8) octets long.)|