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1. (WO2018142526) RELAY DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD

Pub. No.:    WO/2018/142526    International Application No.:    PCT/JP2017/003719
Publication Date: Fri Aug 10 01:59:59 CEST 2018 International Filing Date: Fri Feb 03 00:59:59 CET 2017
IPC: H04L 12/749
H04L 12/46
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: IMAGAWA Masanori
今川 正則
Title: RELAY DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD
Abstract:
A GW device (61) relays communications between an IPv4 host (43) connected to a first network, the IPv4 host (43) communicating using IPv4 packets, and an IPv6 device (62) connected to a second network, the IPv6 device (62) communicating using IPv6 packets. The GW device (61) has: an IPv4 communication unit (601) for receiving and transmitting IPv4 packets including multicast DNS requests, which are address acquisition requests for performing name resolution for the IPv6 device (62); a conversion unit (602) for converting the IPv4 packets to IPv6 packets and transmitting the packets; and an IPv6 transmission/reception unit (617) for transmitting the IPv6 packets to the second network. When the conversion unit (602) receives the IPv6 packets including multicast DNS responses, which are responses to the multicast DNS requests, the conversion unit (602) converts the IPv6 packets including the multicast DNS responses to IPv4 packets including the multicast DNS responses and transmits the packets. The IPv4 communication unit (601) transmits the IPv4 packets including the multicast DNS responses to the first network.