If you look a little deeper the loopback is not implemented in Vista. You get to add it.
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I'm developing a software that connects to an external device through UDP/IP using a cross cable. That device's default IP is 127.0.0.1 (I know this ip is reserved for loopback, but the device is developed by a third party and that's it behaviour). When my software starts, it sends an UDP broadcast "echo" to search any device connected.
My problem comes here: in Windows Vista when the device answers that echo, it sends a packet with ip source address 127.0.0.1, but my software can't receive it. I've checked that it works perfectly in XP, but in Vista it seems to be any sort of
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