IPv6 / IPv4 translator

• US 20060153230A1
• Filed: 01/13/2005
• Published: 07/13/2006
• Est. Priority Date: 01/13/2005
• Status: Active Grant

• Current Assignee: Yokogawa Electric Corporation
• Original Assignee: Yokogawa Electric Corporation
• Inventors: Endo, Masahito, Miyata, Hiroshi
• Granted Patent: US 7,573,903 B2
• Time in Patent Office: Days
• US Class Current: 370/466
• CPC Class Codes: H04L 61/251 between different IP versions
• CPC Class Codes: H04L 61/4511 using domain name system [DNS]
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/167 Adaptation for transition between two IP versions, e.g. between IPv4 and IPv6 translation of Internet protocol [IP] addresses H04L61/2503

Abstract

The objective of the present invention is to realize a structure which enables a client to utilize a translator without changing the DNS server specification, when a service targeted at general clients is provided. Therefore, the present invention is characterized by having an IPv6/IPv4 translator in which packets are translated reciprocally between IPv6 and IPv4 protocols, a configuration is employed so that a DNS query from a client reaches the translator DNS proxy using a dedicated domain effective as a specific DNS domain, and the above translator DNS proxy is able to be specified an operation by entering a defined character string in FQDN. While the present invention is also characterized by the fact that the above-described client specifies at least either an IPv6-based address or an IPv4-based address in FDQN as a desired address and the client also specifies at least either a translated address or an un-translated address as an address for the returning response. According to the present invention, communications via a translator can be used if necessary without changing the DNS server specification at the client terminal, and the user can communicate via a translator if necessary by explicitly specifying the address. In addition, since specifying a translator becomes unnecessary, it becomes possible for even general unspecified clients to utilize communication via a translator. Further, the user can specify the address translation policy for the translator DNS proxy.

Claims

1. An IPv6/IPv4 translator which reciprocally translates packets between IPv6 and IPv4 protocols and is configured so that a DNS query from a client reaches its DNS proxy using a dedicated domain effective as a specific DNS domain;

said translator DNS proxy specifying an operation by entering a defined character string in FQDN.

2. An IPv6/IPv4 translator in accordance with claim 1, wherein said client specifies at least either an IPv6-based address or an IPv4-based address in FDQN as a desired address.

3. An IPv6/IPv4 translator in accordance with claim 1, wherein said client specifies at least either a translated address or an un-translated address as an address for a returning response.