If WPE could somehow block packets that match certain length then I would be most happy. However so far I have not managed to make any filters that check packet length and block those that exceed it. And yes, there are too many combinations to make filters for. A very useful function for WPE would be a check whether a byte is NOT the given value rather than check if it is every possible one, like your idea suggests, Gry. WPE is by no means a perfect packet editor. In fact its far from that.