simple question why do you prefer to turn USB feature off in router ? and what is the difference between Soho ,SPI ,NAT Firewall ? and actually how good is a hardware firewall is hackable from out side ? Like if a hacker know my IP address and i got both Hardware+ software firewall will he be able to hack into my computer if all the port is stealthed Remotely also I've my hardware firewall port 80 is open and the other is closed how much of security hazard are those should i change my router ? are there ways to create a Hardware Firewall without using Router and how much reliable is that ? Edit : Also i want to add that i know that routers are a Mini computer that run os Like linux /dd wrt or what ever to filter packets are there a way to create a Firewall that will electrically filter the in bound packets without an os Like if there is a way to know from electric voltage of frequency if a packet is inbound or outbound and we can create a Filter that is Fool Proof for inbound Traffic i tried to Look for how Hardware Firewall is Made But didn't find any resources about that anyone here can shed a lite on this idea ?