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COMMUNICATION APPARATUS, COMMUNICATION METHOD AND COMMUNICATION SYSTEM

  • US 20090313386A1
  • Filed: 09/07/2007
  • Published: 12/17/2009
  • Est. Priority Date: 09/22/2006
  • Status: Abandoned Application
First Claim
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1. A communication apparatus which is connected to a server via a first relay apparatus having a NAT (Network Address Translation) function, comprising:

  • an address information check request transmitting unit for transmitting a plurality of address information check request packets whose source port numbers are set to be local port numbers different from each other of the communication apparatus and whose destination port numbers are set to be the same port number as that of each other, the same port number being a port number of the server, to the server, on a one-by-one basis;

    a communication preparation request transmitting unit for transmitting a communication preparation packet whose source port number is set to be the same port number as the source port number of any of the plurality of address information check request packets, to a destination different from the server, after the address information check request transmitting unit transmits the first address information check request packet and before the address information check request transmitting unit transmits the final address information check request packet; and

    an address information receiving unit for receiving the same number of address information check response packets as the number of the address information check request packets, the address information check response packets being returned from the server in response to the address information check request packets, and including relay port numbers translated from the source port numbers of the address information check request packets in the first relay apparatus.

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