Good old "ZAP the PRAM", as the AppleTalk node is held in PRAM and may not be being negotiated properly.

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The AppleTalk client should negotiate a unique ID every time. In the ten years that we routed AppleTalk for a peak of 2,000 clients, I saw a conflict twice (in the same router zone, too). In this case, it is difficult to believe a conflict has occurred on a three node network, but always possible.