Hi, I have a feeling of missing something obvious. UDP receiver application. It holds a collection of valid UDP sender IPs - only guys with IP on that list will be considered. Since that list must be looked at on every packet and UDPs are so volatile, that operation must be maximum fast. Good choice is Dictionary but it is a key-value ...
In UDP, destination IP and destination port number are used to demultiplex the packets, but in TCP destination IP, source IP, destination port number and source port numbers (4-tuple) all needed to distinguish between the connections why reasoning for this usage. ...
Hello everybody! I have a game server (WoW). I want my players to download my custom patches to the game. I've done a program that checks for update/downloading things. I want my program to send a packet to my game server if player have all my patches. I dont need any response from the server, it will handle it, but its another story. ...
Hello guys, I have a .NET program that "listens" and broadcasts on the same port. So, when it broadcasts packets, these packets loop back to my program, and I wish it didn't happen. Is there a way to block broadcast loopback? ...
I have to write a UDP client. Unfortunately, the source system is not always available Is there a simple tool out there that I can use to create a fake UDP server/traffic on my machine? ...
Can clients using http 1.0 or older use UDP sockets instead of TCP sockets? I was wondering as to what could prevent such use apart from firewall issues and packet size limitations. However, if that isn't a problem, is there anything else that prevents such use. Also, have they been used traditionally? ...
Here is my code Socket sck = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); sck.Bind(new IPEndPoint(IPAddress.Any, 0)); // Broadcast to find server string msg = "Imlookingforaserver:" + udp_listen_port; byte[] sendBytes4 = Encoding.ASCII.GetBytes(msg); IPEndPoint groupEP = new IPEndPoint(IPAddress.Parse("25...
I'm using the socket.makefile method to create a file-like object on a UDP socket for the purposes of reading. When I receive a UDP packet, I can read the entire contents of the packet all at once by using the read method, but if I try to split it up into multiple reads, my program hangs. Here's a program which demonstrates this proble...
Hi, I have a network software which uses UDP to communicate with other instances of the same program. For different reasons, I must use UDP here. I recently had problems sending huge ammounts of data over UDP and had to implement a fragmentation system to split my messages into small data chunks. So far, it worked well but I now encoun...
I'm trying to write a Syslog listener and so far so good on getting it to accept incoming messages through TCP but I also want UDP to function. This is the UDP server code I'm using, which works using a python client app. I also have another app which also works just using the python client app. # Server program # UDP VERSION from so...
I am refactoring a UDP listener from Java to C. It needs to handle between 1000 and 10000 UDP messages per second, with an average data length of around 60 bytes. There is no reply necessary. Data cannot be lost (Don't ask why UDP was decided). I fork off a process to deal with the incoming data so that I can recvfrom as quickly as poss...
Hi there, This is just a general question relating to some high-performance computing I've been wondering about. A certain low-latency messaging vendor speaks in its supporting documentation about using raw sockets to transfer the data directly from the network device to the user application and in so doing it speaks about reducing the...
I am new to multithreading & socket programming in Java. I would like to know what is the best way to implement 2 threads - one for receiving a socket and one for sending a socket. If what I am trying to do sounds absurd, pls let me know why! The code is largely inspired from Sun's tutorials online.I want to use Multicast sockets so that...
I'm developing a STOMP binding for Ada, which is working fine utilizing TCP/IP as the transport between the client and an ActiveMQ server configured as a STOMP broker. I thought to support UDP as well (i.e. STOMP over UDP), however, the lack of pertinent information in the ActiveMQ documentation or in web searches suggests to me that thi...
how to send a file in java to multiple users using UDP? ...
I'm trying to establish UDP communication between a MAC OS and an iPod through Wi-Fi, at this point I'm able to send packets from the iPod and I can see those packets have the right MAC and ip addresses (I'm using wireshark to monitor the network) but the MAC receives the packets only when the wireshark is on, otherwise recvfrom() return...
I have a problem with a little C script which should run as a server and launch a popup for every message arriving. The execl syntax is correct because if I try a little script with main() { execl(...); } it works. When I put it in a while(1) loop it doesn't work. Everything else is working, like printf or string operation, but not ...
hi guys ! Currently I am working on video conferencing project.For this i m using pwnat for nat traversing. pwnat is based on udp tunneling.I m using the TCP connection for data transmission. My problem is that when i send a packet , it does not reach properly at its destination side . Sometime it drops the packet and many times it...
In UDP client after executing: socket.SendTo(data, SendIP); Why does socket.LocalEndPoint change? ...
I am supposed to connect to external server using UDP sockets in C#.. I could not understand these 2 lines in server usage notes: "Use of dedicated sockets is enforced." and "If the server looses UDP connectivity with the client, it will ..." I thought that the UDP socket is connectionless! So what did "looses connectivity" mean? a...