title: Is it possible to accurately determine the IP address of a client in java servlet
body: <p>I want to configure a machine in my network to accept all calls from a specific machine without authentication. For this I am planning to use the IP address of the client machine as the required trust factor to allow unchecked authentication.</p>
  
  <p>My concern is that is it possible to accurately determine the IP address of a client in a java servlet? Is it possible that the IP which I get in the servlet can be changed by some hacking mechanism to made my server to believe that it is the trusted IP?</p>
  
  <p>For example if my server machine is configured to trust 192.168.0.1, then is it possible by some other client other than 192.168.0.1 to pretend as 192.168.0.1 and fool my authentication mechanism?</p>