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

Is it possible to put an entire 500-page book in a database with PHP?
I am working on an intranet and I was wondering if its possible to code php with mysql to enter a fu

PHP4 to PHP5 Conversion
Hi Everyone,

I am working on a site that is built up on PHP4 and each page is being started f

how to populate a drop down box
Hi buddies!

PROCEDURE DOWNLOAD_REPORT_FORM (report_name varchar) is begin DOWNLO

Output Full URL of Current Page
Let's say I am currently viewing a dynamic page:

http://www.mydomain.com/directory/index.php

Delete records not in top 15
Hi,

I'm creating a hall of fame page in my game and the page will only display the top 15 sco

Struct/union and scope problem!
HI all , I have
Code: in header.h typedef struct Node Link; /* ---------

natcasesort works on one server but not on another
Hi

I have a problem that I was hoping that someone can help me with.

I'm trying to use

help with email script...
hey

I need help with my mail script

when the form on http://www.mcgdesignstudio.com/c

rand() function
just a general question guys a girls, is the rand() function 100% random or is it based on time?

Problem with Subscreen
Dear Experts ,
I am facing a problem with the subscreens. My senario is as follows :

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