Binding 2 UDP sockets on same port, connected to different destinations, 1 receives
Posted on
16th Feb 2014 07:03 pm by
admin
Hello,
My application wants to send/recv data to 2 different UDP ports on a remote computer, using the same source port.
So I bind to the same local port which works, and connect to the remote IP : port which works as well, but then randomly only one of the two sockets will receive data from the stack, even though packets are arriving on the network for both.
In this code, the local UDP port is always 13398; the first time this code is called, the destination is 192.168.13.45:6970 and the second time it's 192.168.13.45:6972.
What would cause only one of the sockets to receive data afterwards? Also it's randomly the first or the second one that receive data, but once both sockets are binded and connected, only that random one will receive data.
Thanks!
SOCKET serverSock = ::socket(AF_INET, SOCK_DGRAM,IPPROTO_UDP);
int i=1;
if ( setsockopt(serverSock, SOL_SOCKET, SO_REUSEADDR, (char *)&i, sizeof(i)) != 0 ) {
logger.warn(_T("Could not set SO_REUSEADDR: %s"), GetWSATextError(WSAGetLastError()));
}
SOCKADDR_IN saServer, dest;
memset(&saServer,0,sizeof(saServer));
saServer.sin_family = AF_INET;
saServer.sin_addr.s_addr = INADDR_ANY; // Since this is a server, any address will do
saServer.sin_port = htons(m_manager->GetLocalUDPPort()); // Convert int to a value for the port field
int ret = bind(serverSock, (struct sockaddr *) &saServer, sizeof(saServer));
if (ret != 0) {
logger.warn(_T("Could not bind to udp port 1: %d, %s"), m_manager->GetLocalUDPPort(), GetWSATextError(WSAGetLastError()));
return false;
}
memset(&dest,0,sizeof(dest));
dest.sin_family=AF_INET;
dest.sin_addr.s_addr=m_deviceIP;
dest.sin_port = htons(m_devicePort1);
ret = connect(serverSock, (sockaddr *) &dest, sizeof(dest));
if (ret != 0) {
logger.warn(_T("Failed to connect to udp 1: %s:%d, %s"), inet_ntoa(dest.sin_addr), m_devicePort1, GetWSATextError(WSAGetLastError()));
return false;
}
No comments posted yet
Your Answer:
Login to answer
202
12
Other forums
Help to integrate whois Domain Details to website
Hi,
can i know is their any php script r methods to add domain details to my website.
Javascript or not?
How many people prefer javascript/ajax sites? How many prefer the good old fashion straight php sit
Matchcode in ALV change header column
Hello everyone,
I am working in an SAP system that is currently in upgrade and conversion
please help me in this update statment
hi every one
if I have table and this data in it
id name
10
Which practice of iteration through containers is preferred
In the "real world" what kind of loop do most people use to iterate through a container like a vecto
Calender Not Opening
The following code is not loading the javascript calender in another window. It's not doing anything
Create a form of 2 numbers input and find the greatest.
Hi, everybody.
I have a homework in my training of php, which ask you to make a form that ask
How do I replace any number of character occurences with one occurrence?
How do I replace any number of character occurences with one occurrence?
Let's say I have:
Windows Authentication
I have a website which is windows authenticated.
now i want something more on this application.<
MySQL issue
I am taking sentences through a form on page. Then checking some condition and trying to insert them