Network security system

Network security equipment without the necessity of using a separate computer is indicated. This equipment is a form of a boxed hardware component, and constituting from a HTML interface is desirable. It is used including the network card of three sheets. The first two cards (80, 110) are used for firewalls. The 3rd card is management interfaces which have not the IP address routed publicly but a private address. The 1st network card transmits a packet to a packet filter (90). The packet which passed the filter (100) is transmitted to the 2nd network card (110), and is transmitted to those addresses after that. No these cards have an IP address routed publicly. Equipment works as a packet filter which carries out [not routing or carrying out a proxy] the bridge of the packet. It can be arranged between a router, a hub, or a server machine.