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;
}

Your Answer:

Login to answer

Other forums

Syntax error
hi im having a little trobble with this script
-------------------------------------------------

Pass sql into pl/sql and create RMAN duplicate script.
Hi,

I'm new to pl/sql and I'm trying to write a script that will generate some RMAN comma

how to query data from website using VC?
I want to query some datum from a website,so I need a program to read data from a .csv file, and ass

$action = "insert"; //$action = $_GET['action'];
$action = "insert";
//$action = $_GET['action'];

why is this invalid type? I am

Writting a script to arrange images........ need some help
Ok so here is the link

http://hmtotc.com/dev/projects/vrassociates/jeweler_dev/admin/index.ph

Remove Rows From Database ad
Hi All,

I have this:

Code: [Select]<?php
session_start();
include('../com

Displaying data from database into a 2 dimensional table
Good day!

I'm a beginner in PHP and I'm not expecting a full coding for this qestion. I'm jus

need help with php get
i have a option box that gets filled with dates, but how do i get once the option value has been cli

AutoChoosing a CSS file based on URL
Hey everyone,

I have a site that has multiple URLs and CSS files.

Based on the URL tha

Connect to database that isn't localhost
I am currently doing a small script for a company that doesn't have mySql support on there hosting.