Abstract: A network apparatus for redirecting a network packet, comprises a network interface for receiving the network packet; and an interceptor for receiving the network packet from the network interface, evaluating which port is being used for the network packet, replacing a destination IP address of said network packet with a further destination IP address if the port is one or more predetermined ports, and allowing the network packet to exit the network apparatus with the port unchanged if the port is not one of the one or more predetermined ports.

Abstract: A firewall for selectively allowing or blocking traffic between a first network interface and a second network interface. A packet classifier evaluates the traffic between the first network interface and the second network interface and allows or blocks the traffic based on content of classifier data accessible by the packet classifier. An IP address identifier identifies an IP address of the second network interface. A classifier data updater initiates a request for the classifier data to be updated, and receives an update to the classifier data responsive thereto, wherein the request is transmitted from the updater to the first network interface, the update is received from the first network interface, and the request identifies the firewall as destination of the update with the IP address of the second network interface identified by the IP address identifier.

Abstract: A network device comprises an IP address identifier that identifies an IP address of a further network device that is coupled to the network device; and a requester for transmitting a request to receive a response from a network coupled to the network device, wherein the request uses the IP address of the further network device identified by the IP address identifier to identify the network device as a destination of the response to the request.