udp multicast example

. For applications that can tolerate packet loss (real-time audio and video), even if the network is not power. UDP is also generally a good solution.It is also used frequently for small messages and notifications. For example, both DHCP and DNS use UDP.It is worth mentioning that the UNIX network file System (NFS) is using UDP on the LAN.You might think that a f

UDP, broadcast and Multicast (7), udp Broadcast (Reference) TCP/IP explanation, Volume 1: Protocol UDP is a simple datagram-oriented transport layer protocol. Each output operation of a process generates a UDP datagram and assembles it into an IP datagram to be sent.

data in this group. It should be noted here that only UDP has broadcast, multicast delivery mode, and TCP is a one-to-one connection communication. The focus of multicasting is to efficiently send the same package as much as possible to different, or possibly unknown, devices. But the TCP connection is a pair of clear, only unicast. In the Java API, the implementation of

UDP MulticastImplement the server to group the client to play (send data).Implementation steps:server.c1. Create a server socket#include #include int socket (int domain, int type, int protocol); return Socket2. Building the server address structurestruct sockaddr_in serveraddr;#include Bzero (serveraddr, sizeof (SERVERADDR));serveraddr.sin_family = af_inet;SERVERADDR.SIN_ADDR.S_ADDR = htonl (Inaddr_any); IpServeraddr.sin_port = htons (server_port);//

data in this group. It should be noted here that only UDP has broadcast, multicast delivery mode, and TCP is a one-to-one connection communication. The focus of multicasting is to efficiently send the same package as much as possible to different, or possibly unknown, devices. But the TCP connection is a pair of clear, only unicast. In the Java API, the implementation of

perform additional frame filtering. First, the frame type must specify the protocol to use (IP, ARP, and so on), followed by multicast filtering to check whether the host is a multicast group with multicast address descriptions.The device driver then transmits the data frame to the previous layer, for example, when th

UDP multicast can be used to broadcast data in the intarnet or Internet datagram mode (multicast over the Internet requires the router to support IGMP (Internet gateway management protocol, this Protocol appears after the IP address appears to support multicast )). compared with broadcasts that consume extremely bandwi

optimized, and only terminals are added to a broadcast group, only UDP multicast data can be received by him.UDP multicast adopts the connectionless and datagram connection mode, so it is unreliable. That is, the order in which the data can arrive at the receiver and the data arrival is not guaranteed. However, UDP do

Source: http://158067568.iteye.com/blog/901052udpbroadcast and Multicast Author: Legend QQ: 158067568 We recommend that you do not connect to UDP before transmitting information. In other words, the client sends information to the server. The client only needs to give the Server IP address and port number, and then encapsulate the information in a message to be sent and send it out. The client does not care

multiple receivers. If multicast is not used, most of these applications are now implemented by TCP (sending a separate data copy to each destination address). However, even with multicast, some applications may continue to adopt TCP to ensure its reliability.2 client requests to the server. For example, diskless workstations need to be determined to boot the bo

memory leak:Calling the DeleteObject in the API[System.Runtime.InteropServices.DllImport ("gdi32.dll")] bool DeleteObject (INTPTR hobject );PrivateBitmapSource Copyscreen () {var handle =IntPtr.Zero; BitmapSource Source =Null;Try{var bitmap =New Bitmap ((intintvar g = Graphics.fromimage (bitmap); G.copyfromscreen ( Span style= "color: #800080;" >0, 0, 0, 0, bitmap. Size); Handle = bitmap. Gethbitmap (); SOURCE = Imaging.createbitmapsourcefromhbitmap (handle, IntPtr.Zero, Int32rect.empty,

ActionListener {String msg = null; String line = System.getproperty ("Line.separator");p ublic void actionperformed (ActionEvent e) {try {msg = Messagearea.gettext (); FileOutputStream Note = new FileOutputStream ("Note.txt"); Messagearea.append ("The record has been saved in NOTE.TXT "); Note.write (Msg.getbytes ()); Messagearea.append (line); Note.close ();} catch (IOException E1) {System.out.println ("Send Failed");}}} Clear the chat record on the panel class Clearmsg implements ActionListen

Start by figuring out what multicast IP addresses areClass D IP Address is the multicast address, the range is 224.0.0.0 ~ 239.255.255.255It is also divided into the following categoriesDivision of Class D addresses Category Address range Describe Local link address (local network control block) 224.0.0.0~224.0.0.255 For LAN, routers do not forward IP pack

http://blog.csdn.net/victoryknight/article/details/7814243 ThemesUDPQtRoutersIf the two machines in the LAN are separated from each other, the communication between the two machines cannot be broadcast, but we can switch to the multicast communication to achieve the mutual communication effect.A server-sidequdpsocket Udp_socket; udp_socket.bind ( qhostaddress::any, Udp_listen_port, QUdpSocket:: Reuseaddresshint); qhostaddress mcast_addr ( "224.0.

datausingencoding:nsutf8stringencoding] +Tohost:@"224.0.0.1" APort5050 thewithtimeout:-1 +Tag0]; - $NSLog (@"%@", sendstring); $ if(res) { -NSLog (@"xxxxffff"); - } the Else { -NSLog (@"Error");Wuyi } the } - Wu-(BOOL) Onudpsocket: (asyncudpsocket*) sock didreceivedata: (nsdata*) Data withtag: (Long) tag fromhost: (nsstring*) host port: (UInt16) Port - { AboutNSLog (@"Onudpsocket Successful"); $ -nsstring* str =[[NSString alloc] Initwithdata:data encoding:nsutf8stringencoding

#include #include#include#include#pragmaComment (lib, "Ws2_32.lib")#defineClose Closesocket#undefIp_add_membership#defineIp_add_membership 12intMainvoid) {wsadata WSA={0}; WSAStartup (Makeword (2,2),WSA); SOCKET FD; Sockaddr_in Localif; FD=sockets (Af_inet, SOCK_DGRAM, IPPROTO_UDP); if(FD = =-1) {perror ("Socket"); return-1; } localif.sin_family=af_inet; Localif.sin_port= Htons (1234); Localif.sin_addr.s_addr=htonl (Inaddr_any); if(Bind (FD, (SOCKADDR *) localif,sizeof(Localif)) == -1)

Example sharing for UDP port multiplexing during Python Socket programming, pythonudp About Port multiplexing A socket cannot bind multiple ports at the same time. If the client wants to bind a port number, it must call the bind port before sending the information function, because when sending the information function (sendto, or write ), the system will automatically assign a random port number to the cur

Several days ago, I constructed a DNS packet and checked some information. It seems that many of my friends have always had problems with the UDP packet checksum. I tried some sample code and there were also problems. So it took some time to make a successful example. In Linux, GCC passes and verifies the success. # Include # Include # Include # Include # Include # Include # Include # Include # Include Uns

Example of UDP communication for socket communication in PHP This paper describes the UDP communication method of socket communication in PHP. Share to everyone for your reference. Specific as follows: 1. Create a simple UDP server ? 18//Server information $server = ' udp:/

Content: A simple example of UDP communication.Receiver:public class Receiver {public static void main (string[] args) {Datagramsocket ds = null;try {//udp Receive-side ds = new Datagramsock ET (8080);//defines where UDP packets are received byte[] buf = new byte[1024];//defines the data receive packet for