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
Simple code help with redirects
I am trying to figure out a redirect script that detects if the browser is IE 7 and if it does, redi
Async WSAConnect failed on XP with error code = 2 ("File not found")
Hi all,
I have very strange bug, please help me if you can.
It is reproduced o
Form Help
Here is the form:
Line number On/Off | Expand/Contract<? include("../include/sess
need a script for 3 pages
I have a customer who wants me to set up a site with a number of pages with the following requiremen
Why Are These Functions Causing MASSIVE Memory Problems? Please Help!
Hi,
I have a script with some options.
I use regex to replace patterns in strings, but
mysql timestamp manipulation
How could I use a timestamp (e.g 2009-10-30 13:20:35 ), and with php find out if it is:
from
Need help-Error istream header declaration
Hi Everyone ,
I am having issue with istream declaration. I am new to C programming.
can a
Multiple Options for a Single Page
For this example I want to use the Handlers option which is under Fed Admin and all the related codi
elseif help!
OK so I'm new to the site, as well as PHP altogether (Trying my hand at managing an online RPG) and
License Issue - service type user
Hi,
I would like to understand the following issue regarding sap license.
I wish to