Datagram is mostly a synonym for packet. An application data stream can be broken into segments. A segment is carried over a datagram, then segments are reassembled into the original application stream. This is typically done by the TCP layer. So in TCP we have application stream over TCP segment over IP datagram over data-link frame.

2011年1月14日 · Using a datagram protocol like UDP allows the software to recover from such an event extremely quickly, by simply ignoring the lost data or re-requesting it sooner than TCP would. VoIP is a good candidate for simply ignoring the lost data -- one party would just hear a short gap, similar to what happens when talking to someone on a cell phone ...

2016年5月17日 · Datagrams are the IP packets that provide a quick and unreliable service like UDP, and all IP packets are datagrams;[4] however, at the TCP layer, what is termed a TCP segment is the sometimes necessary IP fragmentation of a datagram,[5] but those are referred to as "packets".[6]

2010年11月11日 · The best way to find the ideal datagram size is to do exactly what TCP itself does to find the ideal packet size: Path MTU discovery. TCP also has a widely used option where both sides tell the other what their MSS (basically, MTU minus headers) is.

2024年1月2日 · Constructs a datagram socket and binds it to any available port on the local host machine. The socket will be bound to the wildcard address, an IP address chosen by the kernel. However, when the server receives a datagram, you are ignoring the IP and port where the datagram was actually sent from: DatagramSocket.receive(DatagramPacket)

A process receiving messages on a datagram socket may find messages duplicated or in an order different than the order sent. Record boundaries in data, however, are preserved. Datagram sockets closely model the facilities found in many contemporary packet-switched networks.

2016年3月18日 · I have wrote a generic program that can accept data from DataInputStream. But recently I was trying to receive data from UDP using DatagramSocket.

2024年8月15日 · A minor point: for the sake of readability, avoid import *.Either list the imported modules or functions explicitly or just import the base module and use the dot notation throughout your code; this way, future readers (including yourself!) will quickly be able to identify where things are coming from. @bsa provides other good suggestions to improve the quality of your code.

The UDP header has a datagram length field that is 16 bits, meaning that that the largest theoretical UDP datagram is 65,535, but that can never be reached because UDP is encapsulated inside an IP packet, which has a theoretical overall maximum length of 65,535 (the same) but you must subtract the IP and UDP headers from that size to figure the ...

2012年9月11日 · I need to create a 10 second timeout on this part of the code DatagramPacket getack = new DatagramPacket(incoming, incoming.length); socket.receive(getack); I need it to listed for incoming p...