The UDP Message
A UDP message, consisting of a UDP header and its payload (a message), is identified in the IP header with IP Protocol number 17 (0x11). The message can be a maximum size of 65,507 bytes: 65,535 minus the minimum-size IP header (20 bytes) and the UDP header (8 bytes). The resulting IP datagram is then encapsulated with the appropriate Network Interface Layer header and trailer. Figure 9-1 shows the resulting frame.
Figure 9-1. UDP message encapsulation showing the IP header and Network Interface Layer header and trailer
In the IP header of UDP messages, the Source IP Address field indicates the host interface that sent the UDP message. ...
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