COMMUNICATION APPARATUS, COMMUNICATION METHOD AND COMMUNICATION SYSTEM
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United States of America Patent
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Issued Date -
Dec 17, 2009
app pub date -
Sep 7, 2007
filing date -
Sep 22, 2006
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Abandoned
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Abstract
A communication apparatus (10) transmits to a server (001) three address information, check requests 1 to 3 whose destination port numbers are set to be [SP1] and whose source port numbers are set to be respective [LP1] to [LP3] different from each other. The communication apparatus (10) also transmits a P2P communication preparation packet whose source port number is set to be one of [LP1] to [LP3], to a destination different from the server (001), between the address information check requests 1 and 3. The communication apparatus (10) determines the NAT characteristic of a router (101) based on port numbers [GP11], [GP12] and [GP14] of the router (101) notified of by address information check responses 1 to 3.
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