Problem Trying to unicast packets to available networks.

Trying to unicast packets to available networks. There are totally 3 networks. Managed to get packets in only one network.But i am not able to receive the packets in different networks.

using this code..

foreach (var i in System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces())
            {
                foreach (var ua in i.GetIPProperties().UnicastAddresses)
                {
                    System.Windows.Forms.MessageBox.Show(ua.Address.ToString());
                    IPAddress Tip = IPAddress.Parse(ua.Address.ToString());
                    IPEndPoint targetEndPoint = new IPEndPoint(Tip, iTargetPort);
                    MyUdpClient sendUdpClient = new MyUdpClient();
                    int numBytesSent = sendUdpClient.Send(CombineHeaderBody, CombineHeaderBody.Length, targetEndPoint);
                }
            }

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