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.

Did you know?Explore Trending and Topic pages for more stories like this.
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 Like 12 Dislike
Previous forums Next forums
Other forums

UDP Multicast question
Hey,

Im not really in the know when it comes to network related programming and activitie

form problem
Hi all, I think this is going to be easy to resolve but for I have been looking at it to long and I

A Few Questions
Hi, I want to ask a few questions that I can't seem to find..

1) I'm creating a "shortcu

ok i need to join all this pages to make 1 neat code
i have 5 pages that make up my tv guide it works 100% but i want to make it 1 page if i can or 2, i

socket communication between c++/java and sending image
hi,

i have a class in c++ called win32_sockserver which creates socket to java. i am trying

asp authentication problem
Hello all, I want to use the asp authentication (from asp.net configuration) in my web site. there

links using header()
Hi All

I'm not sure where to ask for help on this but I hope someone can offer some. I'm at

BB_Code error
I'm having a problem with a custom built function and keep getting this error:


Warning: M

Using the $_GET variable to view certain records
Hello,

First let me explain my problem, I have 2 pages the first page pull a list of Guide ti

Consuming third party Payment Gateway API from Procedure.
Hi All,

First of all i would like to thank all the people of the oracle forum for providi

Sign up to write
Sign up now if you have flare of writing..
Login   |   Register
Follow Us
Indyaspeak @ Facebook Indyaspeak @ Twitter Indyaspeak @ Pinterest RSS



Play Free Quiz and Win Cash