I bet that when you say emplode can't see it that you mean it won't automatically find it on the network. IIRC, this is because emplode uses sort of a brain-dead algorithm to send out broadcast packets. (I might be mixing it up with jEmplode. If so, sorry.) I think it just guesses that the broadcast address is a.b.c.255 instead of figuring out what the real broadcast address is. It probably ought to use 255.255.255.255, but doesn't.

Um, I don't think I really have a workaround for you, though, unfortunately.