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Scott - a common question. We maybe should have changed the item name to something else? The mask is not used for subnetting in this case. Rather the mask is exclusive or'ed with the incoming address for comparison purpose for authentication. For example, a mask of 255.255.255.255 allows a single incoming address to pass. A mask of 255.255.255.0 allows any of 256 addresses to pass. For our purposes, we are trying to grant authentication to a single node at a particular address, hence a mask of 255.255.255.255 is the proper setting.