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I am working on Holepunching using UDP and UDT. For the final testing I need to test the application on different NAT types (Symmetric,full cone,restricted cone, port restricted NATs).
Is there any method I can simulate these? What I expect here is some kind of virtual-Box setup. Can I use PC as a router so that I can configure according to my needs?
In general how do we test applications for different network conditions?
I think you already answered your own question, use VirtualBox (or VMware, Xen, etc..).
I’ve done this very thing successfully by setting up mini-lans of VM’s. If you’re looking for software to act as your router inside a VM, I’d start off at http://www.pfsense.org/ and see if that meets your needs. It’s a FreeBSD distribution tailored for being an easy to install router/firewall with a nice web management UI and all of that.
If pfsense doesn’t fit your needs, there are plenty of other linux/bsd distributions out there that are tailored for this kind of stuff and that you can install in a VM: http://en.wikipedia.org/wiki/List_of_router_or_firewall_distributions for a good list 🙂 (I’ve heard good things about OpenWRT and ClearOS as well.)