title: how can we set up Proxy server dealing with UDP packets?
body: <p>Usually we can set up a proxy server by some kind of tools such as CCProxy which provides proxy services for HTTP, SOCKS, FTP packets etc.
  Also, Proxifier or Proxycap is used to forward the packets of specific application on the client PC.
  However, when UDP packets are forwarded to the proxy server, these packets cannot be correctly forwarded to the destination originally the application wanted them to go.
  When I use a network analyzer to observe the UDP traffic flow, the UDP packets are just passed to the proxy server from my PC without going to the correct destination finally.</p>
  
  <p>Besides, someone suggested that the UDP relay is not enabled in the proxy server so the UDP packets cannot be routed successfully. How can I enable the UDP relay function on the proxy server?(Assume that I can control the proxy server completely)</p>