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NETWORK GATEWAY APPARATUS

  • US 20130195109A1
  • Filed: 03/14/2013
  • Published: 08/01/2013
  • Est. Priority Date: 08/22/2011
  • Status: Active Grant
First Claim
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1. A network gateway apparatus, comprising:

  • a first network interface card connected to a first network and configured to communicate with devices connected to the first network;

    a second network interface card connected to a second network and configured to communicate with devices connected to the second network;

    a processor includingan initialization unit configured to initialize the first and second network interface cards to an unprotected state, anda TCP/IP protocol stack configured to perform communication processing between the first and second network interface cards,wherein when a packet is received via the first network interface card, the processorreplaces an origin MAC address of the packet with a first temporary MAC address, an origin IP address with a first temporary IP address, a destination MAC address with a MAC address of the second network interface card, and a destination IP address with an IP address of the second network interface card,then transmits the packet to the TCP/IP protocol stack, andthe TCP/IP protocol stack transmits the packet to the second network interface card based on the destination MAC address and the destination IP address of the packet after rewriting by the processor.

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