Patent ID: 9473401
Filing Date: 2016-10-18
CPC Classification: H04L

Claim Text:
1. A network separation method used in a relay device including a first virtual router, a second virtual router and a selector, that relays communication between a first network and a second network, the method comprising: outputting to the selector a packet directed to an apparatus in the second network from the first network by the first virtual router, that includes first routing information representing information related to an apparatus connected to the first network, the outputting being performed after interrupting processes on a network layer; outputting to the selector a packet directed to an apparatus in the first network from the second network by the second virtual router that includes second routing information representing information related to an apparatus connected to the second network, the outputting being performed after interrupting processes on the network layer; selecting a first relay packet complying with a prescribed relay rule of an application layer from among packets input from the first virtual router, and outputting the selected packet to the second virtual router by the selector, using a processor; relaying the first relay packet to an apparatus registered in the second routing information by the second virtual router; selecting a second relay packet complying with the relay rule from among packets input from the second virtual router, and outputting the selected packet to the first virtual router by the selector; and relaying the second relay packet to an apparatus registered in the first routing information by the first virtual router.