title: How to fake source ip-address of a udp-packet?
body: <p>Think about the following:<br>
  Your ISP offers you a dynamic ip-address (for example 123.123.123.123).</p>
  
  <p>My question is simple (the answer may not be):</p>
  
  <p>Is it possible to send a single udp-packet with an outer source-ip (for example 124.124.124.124) to a fixed-ip server? I don't need to get an answer from the server. I just want to know if/how this one way communication can be done, using a faked source-ip address.</p>
  
  <p>The server and no one else should not be able to find out the real client ip.</p>