Okay here goes, I get to ask "dumb" questions and so do you posters! No vendor hype or bashing please , we are trying to learn here! 1) What exactly is low level filtering in a firewall? 2) Where does it or should it occur? 3) When does it happen, incoming packets? outgoing? both? 4) Doesn't my router do this for me so I don't have to think about it? 5) Why should I worry about this it is so complicated so surely my SW FW does it for me, after all I paid for the product? 6) I've heard of ARP what else is included in low level?