Title:
通信システム及び通信方法
Document Type and Number:
Japanese Patent JP6387605
Kind Code:
B2
Abstract:
In a communication system, using source address, source port number, destination address and destination port number, terminals A and B located behind NAT routers A and B, respectively, communicate with each other through the NAT routers A and B. A server SV which is not located behind any NAT routers identifies the NAT router A as a NAT router of a certain type which translates the source port number into a different source port number if the destination port number is changed. The server SV then guesses a port number obtained by adding (or subtracting) a value to (or from) the source port number used for transmission of data from the terminal A through the NAT router A as a port number of the terminal A in a case where the NAT router has been identified as the certain type, and informs the terminal B of the guessed port number.
Inventors:
Takahiro Hara
Application Number:
JP2013239405A
Publication Date:
September 12, 2018
Filing Date:
November 19, 2013
Export Citation:
Assignee:
Yamaha Corporation
International Classes:
H04L45/74; H04L45/741
Domestic Patent References:
| JP2011077921A | ||||
| JP2006157941A | ||||
| JP2011077920A |
Foreign References:
| US20110078330 |
Attorney, Agent or Firm:
Yasuo Asami
Koichi Tanimizu
Koichi Tanimizu