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
Lack of simpleXML Documentation
What is up with this.
Look at: http://www.php.net/manual/en/function.simplexml-load-file.php<
Can php detect connection speed and thereafter swap out elements?
No code to post, lads, yet. Just looking for a yay or nay at this stage:
Can a php script be
issues verifying if user is logged in
I am having issues when a user logs in via asp Login control, the IsAuthenticated still seems to com
empty() error
Why does
Code: empty($USER_ID = $_SESSION["USER_ID"])
create this error...
Simpler method of getting variables from mysql
Hi Guys,
I'm trying to streamline my CMS's code and as I was writing a new page it occured to
radio button reamains checked
Hello i'm trying to keep the state off my radio buttons so it shows which ones where clicked after t
db entry based on primary key
My "topics" table contains 10 entires
*--------------*
topicid topic
------
Using CSS to format MySQL query
Hi,
If i want to have a news page on my site, which displays all records of a table in descen
Problem Dereferencing
With these types and tables:
CREATE TYPE MANAGER AS OBJECT (
MGR_ID INTEGER,
Read from forum
Haven't written anything forever and I would like to get back.
What I'm trying to do is getting t