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
php web service error
hey guys,
I'm working on a project requires the use of web services. I've been trying a few tutor
Remove letter from numeric textbox
I have a textbox that will search the employee database by entering in the employee ID and it will r
Post, not working, please help
The error is:
Method Not Allowed
The requested method POST is not allowed for the URL /student
Parse multirow HTML table
Hello all,
I have a site I am working on. Its a sports site and I am trying to add stats to a DB
date("now") prints out wrong date ?
Hi Guys
Anyone know why and how I can fix it ?
this code is not working????
it says this error.. Warning: Division by zero in ..
the variables are correct, so why is th
Adding to an Int row in db
Hi, i have a database which houses all of the users of my site. One of the columns is for points whi
Two fgetcsv related questions ;D
First of im trying to get a file from a merchants server but the directory is protected, I know the
Buggy registration system
Hey, I just started scripting in PHP, and I ran into a few problems.
Code: <?php
includ
Output Buffering question
Hi all,
I've been trying to wrap my head around output buffering. So far I've found tons of