Sending DNS messages back to the web-browser

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C#

I wrote a block of code that reads the byte stream from the browser on UDP/53 and sends this to a DNS server and gets a valid result back but when I send this byte stream back to the browers using UDP packets on the remote endpoint use to make the original request the browser simply sends the request back again and yet calling the code from a socket works fine.

The reason I need this code is because BT Home are sending back fake DNS results in the UK and this allows site to bypass IP address that I have banned in the firewall.

public void Listen()
{
receiveSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp );
receiveEndPoint = new IPEndPoint(IPAddress.Any, receivePort); receiveSocket.Bind(receiveEndPoint); 
receivePort = (receiveSocket.LocalEndPoint as IPEndPoint).Port; 
receiveBuffer = new byte[BufferSize]; 
receiveAsyncResult = receiveSocket.BeginReceiveFrom(receiveBuffer, 0, receiveBuffer.Length, SocketFlags.None, ref receiveEndPoint, new AsyncCallback(NetworkMessageReceivedCallback), receiveSocket);
}
public void NetworkMessageReceivedCallback(IAsyncResult asyncResult)
{
EndPoint remoteEndPoint = null; 
byte[] bytes = null; 
remoteEndPoint = new IPEndPoint(IPAddress.Any, 0); //Will contain the clients port 
int bytesRead = receiveSocket.EndReceiveFrom(asyncResult, ref remoteEndPoint); 
bytes = new Byte[bytesRead]; 
Buffer.BlockCopy(receiveBuffer, 0, bytes, 0, bytesRead);
//string ip = "208.67.222.222";
string ip = "192.168.1.254";
IPAddress dnsServer = IPAddress.Parse(ip);
Response R = Resolver.Lookup(bytes, dnsServer);
receiveSocket.SendTo(R.Message , remoteEndPoint);//127.0.0.1
receiveSocket.Close();
Listen();
}