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
Amatuer requiring assistance
Beginner and amateur in need of assistance
My Site - (Spare Parts for Domestic Appliances)
Warehouse Management
Hi,
On our system, we have two storage locations ( A and B ) where A is the main factory
GET vs SUBMIT Button to show sections on one index.php page?
Just curious if one of these ways is better (i.e. more efficient) than the other.
I have a
DB2 for z/OS, LUW, iSeries
Hello,
In this forum a lot of threads related to other members of the DB2 family than DB2 for z/OS
php sessions,logouts & the bloomin back button!
Hi All,
I've got a cms that members can log into. When they logout, the session is destroyed,
Save cookie to DB
I'm working on a pixel tracking script for an incentive website and I need to use an ASP script to s
retrieving policy name inside the function called by this particular policy
Hi there,
I've playing around with dbms_rls package, trying to set up some security repo
form submit at godaddy?
Trying to test form submission at GoDaddy and it does not seem to work. Here's the page...
h
unoconv doc convert to pdf code prob
PHP/5.3.1
Hi. I am trying to use this code to convert docs to .pdf utilizing unoconv. Howe
Get dump of MySQL DB from Live Site
I'm after an easy, but secure way of generating and importing a MySQL dump from a remote server.