Conciousness in Buddhism and Advaita Vedanta

I would be happy if someone could clear up a doubt for me. When Advaita talk about consciousness without boundaries it is said to be the "Self". It is described as combining being and knowing in one thing. This being and knowing divides itself in two, and becomes the knower (subject) and the known (object), which creates the duality. Now when the knower-and-the-known duality has been eradicated, it is said that what remains is this knowing-being self. Now I am confused because I heard that somewhere in the Canon the Buddha talked about the conciousness vinjana without boundaries that the Arahat have. Is he talking about the knowing-being self that the Advaita is talking about? And what exactly is this consciousness that the Buddha talks about: is it the same as knowing-being that Advaita talks about, when the duality of self and not-self has been removed? I read somewhere that Buddhism says that knowing-being is not true: because consciousness always consciousness-of-something, in other words it cannot be conscious-of-itself, and therefore consciousness-of-itself or knowing-being as one thing is not possible. Please clarify this for me so that I understand, thanks.