Network system and communication apparatus for performing communication among networks having different VLAN settings

  • US 9,923,733 B2
  • Filed: 08/28/2012
  • Issued: 03/20/2018
  • Est. Priority Date: 08/28/2012
  • Status: Active Grant
First Claim
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1. A network system comprising:

  • a plurality of communication apparatuses, each of the communication apparatuses being capable of performing a VLAN setting by using a VLAN number set for a connection port, that sets a VLAN number for each of the communication apparatuses, and that performs communication among cars of a train, whereinthe communication apparatus determines, on a basis of information that is given to a packet and identifies a type of communication, whether a received packet is a packet that is set to be permitted to pass and is a specific type of packet that disables a VLAN setting, and in a case where the communication apparatus receives a packet of a multicast address as the specific type of packet, when a distribution target apparatus is connected to the communication apparatus, the communication apparatus transfers the specific type of packet to the distribution target apparatus, disables setting of a VLAN number set for another communication apparatus, regards a VLAN different from a VLAN of the communication apparatus as a same network, and transfers the specific type of packet to the another communication apparatus.

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