title: Spoofing the origination IP address of an HTTP request
body: <p>This only needs to work on a single subnet and is not for malicious use.  </p>
  
  <p>I have a load testing tool written in Python that basically blasts HTTP requests at a URL.  I need to run performance tests against an IP-based load balancer, so the requests must come from a range of IP's.  Most commercial performance tools provide this functionality, but I want to build it into my own.</p>
  
  <p>The tool uses Python's urllib2 for transport.  Is it possible to send HTTP requests with spoofed IP addresses for the packets making up the request?</p>