| 摘要 |
An object of the present invention is to achieve an IPv6/IPv4 packet conversion system capable of TCP-compliant packet size control while executing packet conversion between IPv4 and IPv6 networks. Accordingly, the system of the present invention comprises an IPv6/IPv4 translator installed between IPv6 and IPv4 networks and equipped with a means to output MSS data of a specific value to the IPv4 server when the translator performs packet conversion between IPv6 and IPv4 protocols. The MSS output means employs: a) An MSS conversion block for converting MSS data contained in a session initiation packet input by an IPv6 client into MSS data of a specified value and outputting that data to an IPv4 server. b) An MSS check block for checking the existence of MSS data in a session initiation packet input by an IPv6 client and MSS conversion block for, in the case of the absence of MSS data in the session initiation packet, adding MSS data of a specified value to the packet for outputting to the IPv4 server. These features enable packet size control by adjusting the MSS value of the TCP without the issuance of the "Packet Too Big" message of the ICMP.
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