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
Refining of search Criteria
Dear Friends
I need a help, I have a search page which of cars related, which has different s
styling a RadioButtonList
HiI need to have a radio button and close to it, its lable, then a space then another set of those.
How to copy a part of a vector in a raw memory
Hi,
How can I copy a part of a vector into a memory:
1
2
3
4
5
Help with captcha script needed
Hello,
I am working on a script where reCAPTCHA or a similar form of CAPTCHA will be used, f
standard ALV application toolbar, into custom report....
HI,
I have a question regarding displaying standard ALV menu path and application toolbar
Ten Operator Syntax
Hi Guys,
I can't figure out why i am getting a parse error with this basic ten op code:
Sending CC Info by email
I am a little bit less knowledgable in the security area as most developers and I know I have a lot
UTL File problem
Hi
I have a file in certain path with the following permissions (The file is a dummy file witho
values not being entered into table
hi. I;ve created a form, so that when a user enters data into it, it gets added to a table in a data
Tournament Brackets (Double Elimination)?
Is making a double elimination tournament style bracket system capable of being done in php?