UDP



The User Datagram Protocol (UDP), defined in the RFC768, prepares a simple uncertain transportation services.

16

32 bits

Source port

Destination port

Length

Checksum

Data




Source portport number of the sending application

Destination port

port number of the receiving application

Length

Length over header and data

Checksum

Checksum over header and data plus a so-called pseudo header to the protection against lacking segments (Source IP-Adresse, Destination IP-Adresse, Transport protocol, UDP-length)