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
IIS on 2003 anon access disabled issue
I have an IIS server that belongs to a domain, and anonymous access is turned off for all my sites.
Notice Undefined index: reset/ Attempting to redirect, works, but get a notice
Full Header.php is:
Code: [Select]<?php
$reset= false;
$reset= strip_tags($_GET[&quo
Is there a way to override built in php functions without APD?
I am trying to use the
rename_function()
override_function()
options that are built into
empty() error
Why does
Code: empty($USER_ID = $_SESSION["USER_ID"])
create this error...
Trying to add functions to table
I have this list of characters and I'm trying to figure out what I have to do to put the results of
Delete all files in folder except with certain name
I have a script that I want to delete all files in a folder (taken from a database) except for one n
xml
<?php
echo "<h1>XML Articles</h1>";
$home
Help with looping
I have a comma separated list of colors taken from a database ($ICo) and a directory of images named
random generation
hi
i need help with generating this
numbers from 1-12
i want to generate in ran
How to find OS bit version
How can I tell the person browsing my site is running 32, or 64 bit operating system?