TCP
User Datagram Protocol is a core protocol of the Internet protocol suite. The
UDP provides a minimal and simple interface between a network layer below
and a session layer or application above. This protocol does not guarantee
reliable and in-order delivery from sender to receiver.
UDP header is defined in RFC 768 as below.
Src Port
Source port identifies the sending port and should be assumed to be the port
to reply to if needed. If not used, then it should be zero.
Dst Port
Destination port identifies the destination port and the setting is required.
Length
Shows the packet length in bytes.
Checksum
Optionally, the Checksum may be forced to zero, by selecting the Null
check box.
Touching the TCP layer button displays the parameters available for the
Transmission Control Protocol layer.
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