Modify the IP headers on the iPhone / Bypass or change the ip on any device

Problem: If we need to test an application which is outside the network or with a different IP address how do we do that? we need to be able to use a proxy server that bypasses or replaces some properties that can be then used to modify the way the application is accessed.


Solution:
Here is an example of how to do that on an iPhone (You can do this for any device) :

  1. Go to settings in iPhone and modify the manual IP address. Give it the same IP address as that of the local machine where the proxy server would run and select a valid port : say 8080
  2. To set the IP headers or proxy download the Burp Free edition from here: http://portswigger.net/burp/download.HTML
  3. Go to the Intercept tab and make sure it is off.
  4. Go to Options tab and edit the Proxy listeners to local ip of the machine:
  5. Scroll down to Match and Replace Pick a Request header not in use and modify that:
    In our case “Client-Version” to
  6. Now check the HTTP history tab to confirm that the header is replaced while surfing applications.

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