I'm looking for a network interface simulator, that offers both ends of a network on a single machine (particularly for UDP).
The way com0com works for serial ports, but simulating a network card instead of a serial port.
Is this behavior possible by using the existing network stack in a creative way? (Port forwarding or some such?) Or some creative configuration of OpenVPN, L2TP/IPSec, SoftEther, PPTP, etc.?
I have software I can't change, that binds to certain UDP ports and sends outgoing messages on those same ports. I'd like to intercept and route those messages, but I can't bind to those same ports myself since that software is already binding to them.