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
Using system() and bringing back the results
I am aware that you can use system() within PHP to execute system commands, but I was wondering if t
Passing Arguments to execlp()
I'm writing a program that mimics a unix shell. It's supposed to take commands with arguments and ex
Help with file_get_html
The following code gives the expected results:
<html>
<head&g
ORA-00932: inconsistent datatypes: expected - got CLOB
SO : windows xp
database : XE
there is a table (transito) with two fields of clob
PHP and Javascript
Hi Guys,
Im trying to load the contents of an html file into a text area for editing, this is
Preg_match question
I want to use preg_match to make sure a string is always 6 characters long and only contains 0-9 and
Echo-ing MySQL content and Keep Formatting?
I have data in my MySQL such as:
QuoteBlah blah
Blah blah
etc
but when i ech
parameter passing issue on function
Well I thought I had created a pretty slick web page, using ?page and $_GET to load pages which wher
Need to write a cookie with a url var
Not sure if its possible, but I need to write a cookie with a url.
So this would write 2232 a
ASP.NET Validation Event Cycle
Hi,
I have asp button as follow:
