NOTE : Answers are framed without having any background in Python, but, the questions are irrelevant to language, to be answered. What are these queued connections? In simple words, the backlog parameter specifies the number of pending connections the queue will hold. When multiple clients connect to the server, the server then holds the incoming … Read more
Drawbacks of using TCP for live video: As you mentioned, TCP buffers the unacknowledged segments for every client. In some cases this is undesirable, such as TCP streaming for very popular live events: your list of simultaneous clients (and buffering requirements) are large in this case. Pre-recorded video-casts typically don’t have as much of a … Read more
This is actually trickier than it sounds because if you have more than one interface the broadcasts will not always go out to all the interfaces. To get around this I created this class. public class MyUdpClient : UdpClient { public MyUdpClient() : base() { //Calls the protected Client property belonging to the UdpClient base … Read more
In general this is not possible since multicast packets aren’t routed. There are some techniques to work around this (DVMRP, MOSPF and others) but they all require that you can configure all the routers between your server and the clients (or create a tunnel). There are backbone networks (Abilene, Mbone) with multicast support, but those … Read more
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); IPAddress serverAddr = IPAddress.Parse(“192.168.2.255”); IPEndPoint endPoint = new IPEndPoint(serverAddr, 11000); string text = “Hello”; byte[] send_buffer = Encoding.ASCII.GetBytes(text ); sock.SendTo(send_buffer , endPoint);
Strictly speaking, packet duplication in IP network is allowed behavior of the network and you have to be able to deal with it in your software even if you will somehow get rid of it this time. If you are just wondering about why this happens in your particular case… at a first glance I … Read more
Overview What is causing the inability to send/receive data locally? Mostly buffer space. Imagine sending a constant 10MB/second while only able to consume 5MB/second. The operating system and network stack can’t keep up, so packets are dropped. (This differs from TCP, which provides flow control and re-transmission to handle such a situation.) Even when data … Read more
Does this mean that the send() call will always return immediately if there is room in the kernel send buffer? Yes. As long as immediately means after the memory you provided it has been copied to the kernel’s buffer. Which, in some edge cases, may not be so immediate. For instance if the pointer you … Read more
The receiver must set port of receiver to match port set in sender DatagramPacket. For debugging, try listening on port > 1024 (e.g. 5000 or 9000). Ports < 1024 are normally used by system services and need admin access to bind on such a port. If the receiver sends packet to the hard-coded port it’s … Read more
Here’s the jist of some code I am currently using in a production app that works (we’ve got a bit extra in there to handle the case where the client are server apps are running on a standalone installation). It’s job is to receive udp notifications that messages are ready for processing. As mentioned by … Read more