title: Restrict Spring WS/Rest Calls to Specific F5 or IP Addresses
body: <p>I want to restrict access to Web Service/Rest to specific IP/F5 Addresses only. Here is the Scenario:</p>
  <ol>
  <li><em>Application X</em> has UI that calls only Web Service A</li>
  <li><em>Web Service A</em> calls Web Service B sending Write Instruction</li>
  <li><em>Web Service B</em> performs Write Operation</li>
  </ol>
  <p>How can I make sure that both the Web Services A and B are getting request from proper IPs? e.g:
  <em>A</em> getting a call from <em>Application X</em> and <em>B</em> getting call from Web Service <em>A</em>?
  I want to prevent access to both A and B from other IP addresses that don't belong to the application.</p>
  <p>What options are available and what option will be the best?</p>