This application sends data periodically to a server. What I need to do is setup a testing environment on the local developing machine so that I can check the correct packets are being sent in each situation. I thought a good approach would be a server VM set up on the local computer which would receive the packets and respond just like the real thing, but the problem is how do I route the packets of an application running on windows to a VM machine. I don’t want to modify my application code. I just want to have windows pass on the packets it receives from the application to the VM or otherwise another application that will do the testing. Is this possible? If not, please let me know about any other solution(s) to this problem.
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If you’re running a decent VM you should be able to give it an IP address visible from the host, and configure it so that you can run web servers on it, ssh to it, etc.
Look at the networking features of your VM. Or find a tutorial on how to do this, such as this one for VirtualBox:
http://www.tolaris.com/2009/03/05/using-host-networking-and-nat-with-virtualbox/