Il 3/28/2012 8:24 PM, Jim Bell ha scritto:
On 3/28/2012 7:41 AM, Gianni Ambrosio wrote:
I mean the network adapter created by a virtualization tool (like VMware). I verified that a client on win7 with a such network adapter active does not work (I'm talking about udp multicast, while TCP works perfectly). On the other side if I disable the "real" card and then enable it again, udp starts magically working.
Any idea?
I don't have a link for this, but I know well that, on a Windows machine with more than one NIC (network adapter), outgoing broadcast messages have the FIRST network adapter's address as the return address on messages going out all NICs. The receiver on the second network uses that (wrong) address for the response, and the response doesn't get back to the PC. Disabling and enabling may switch which NIC is considered first (not sure about that).
I've seen this on Windows XP but haven't tried to repeat it on Windows 7. The problem is in the OS.
Dear All, I found that the IP address of the network interface of the client used for the socket connection would be enough to solve the problem. Now, is there a way to get that IP address? I also use a TCP socket connection before starting the UDP multicast. Is there a way to get the IP related to the network card connected to the TCP socket? Here is my actual code. I need to find a way to get the IP "192.168.0.85" that is the address of the network card of client (that calls receiveFrom() method) void BoostUdpSocketMulticast::receiveFrom(const std::string& iMulticastAddress, const unsigned short iMulticastPort) { boost::system::error_code error; boost::asio::ip::address_v4 m_address = boost::asio::ip::address_v4::from_string(iMulticastAddress, error); boost::asio::ip::address_v4 l_address = boost::asio::ip::address_v4::from_string("192.168.0.85", error); endpoint=boost::asio::ip::udp::endpoint(l_address, iMulticastPort); socket.open(endpoint.protocol()); socket.set_option(boost::asio::ip::udp::socket::reuse_address(true)); socket.bind(endpoint); // join the multicast group on a specific interface boost::asio::ip::multicast::join_group option(m_address,l_address); socket.set_option(option); } Regards Gianni