DP8000 Art-Net protocol problem

Recently we encountered problems when we tried to directly control DL.3 fixtures from DP8000 ArtNet output. It seams that DL.3 fixtures requires ArtPollReply packets to be sent from Art-Net sources to receive Art-Net ArtDmx packets.
Anyway, I think DP8000 should respond to ArtPoll packets to identify itself to conform with Art-Net specification. To fully achieve this, every 4 universes should have its own IP address (limitation of ArtPoll reply packet).
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