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

Where am I going wrong
Been trying to work this out for hours

I have two tables called 'Genres' and 'Films'. Genre

Transaction variant for VA02 not working
My requirement is to have transaction for user to only add the output and print a sales order.

Database connection failure
Hello All,

I am trying to create new connection to Oracle DB 10.1,
I could not see a

Sort a two dimensional array.
Hi. I've set up a two dimensional array that reads as follows:

Code: $modifiedData = array(

PHP and Javascript
Hi Guys,

Im trying to load the contents of an html file into a text area for editing, this is

Data storage spaces in varchar2
Trying to understand what's happening.
I am selecting a value from a table that is defined as c

Standard DES encryption script?
Can anybody point me to a tutorial or a short script that shows how to encrypt some text with salt i

Multiple arrays inside data
Hi,

Simple question. I have a column called "array" in my database, and inserted in

php libs/ browsercap.in
ok i have a host that refuses to stay current. they control my php settings and libs. is there a way

Calling All PHPFREAKS Blackberry Users
Are you a member of PHPFreaks and have a blackberry? Well RIM just recently released Blackberry Mes

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