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DNS server

A technology of proxy server and content server, applied in the field of DNS proxy server, can solve the problem that it is difficult for end users to implement, and the request source terminal cannot obtain IPv4 address, etc.

Inactive Publication Date: 2007-06-06
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, there is a problem that the request source terminal cannot obtain an IPv4 address by A query, so it cannot communicate with the counterpart device at all.
[0012] However, the terminals used by Internet users are almost all installed with Windows (registered trademark)-based proprietary software (Proprietary software), so the solution based on the transformation of the above-mentioned terminal software is difficult for end users. Most are difficult to implement

Method used

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Embodiment Construction

[0043] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0044] FIG. 1 is a schematic diagram showing a network configuration of a DNS proxy server to which the present invention is applied. Wherein, 40 is the LAN corresponding to the IPv4 / v6 dual-task to which the user terminal 1 belongs, and 41 is the access network corresponding to the IPv4 / v6 dual-task to which the DNS proxy server 10 belongs. The DNS proxy server 10 is connected to the LAN 40 via the border router 20A. It is connected to the Internet 42 via another border router 20B. The access network 41 is specifically an enterprise backbone network or a provider network, and the terminal 1 communicates with a host device (server, other computer) in the Internet 42 through the DNS proxy server 10 of the provider contracted in advance.

[0045] The Internet 42 is actually a collection of multiple domain networks 43 (43A, 43B, 43C...) managed by various management e...

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PUM

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Abstract

Even if a mistaken reply to a host name resolution request of IPv6 is issued by a DNS contents server, a requesting terminal can still acquire an IPv4 address. When a host name resolution request of IPv6 (AAAA query) is received, a DNS proxy server generates a host name resolution request of IPv4 having an identical domain name, transmits this together with the AAAA query to the DNS contents server, and determines the DNS reply which should be returned to the terminal from the contents of the DNS reply of IPv6 (AAAA reply) and the DNS reply (A reply) of IPv4 received from the DNS contents server. Hence, even if a reply message showing a domain name error is received from the DNS contents server, if the A reply is correct, the DNS proxy server generates an AAAA reply showing that the desired address does not exist, and returns this to the terminal.

Description

technical field [0001] The present invention relates to a DNS server device, and more specifically relates to a DNS proxy server that accesses a DNS content server after receiving a host name resolution request from a terminal. Background technique [0002] In an IP (Internet Protocol) network, DNS (Domain Name System) is widely used in order to acquire an IP address corresponding to a domain name of a communication partner device. DNS is used through a combination of two types of servers. One of them is a server that maintains a correspondence table between domain names and IP addresses and answers IP addresses in response to host name resolution requests. This server is called a DNS content server or an authoritative DNS server. Another type of server is a server that receives a host name resolution request from a terminal and transmits the host name resolution request to another appropriate server. This server is called a DNS proxy server or a DNS cache server. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/28H04L29/06H04L12/70
CPCH04L69/167H04L29/06095H04L29/1282H04L29/12066H04L43/0864H04L29/06142H04L69/16H04L61/6013H04L61/1511H04L61/4511H04L61/59
Inventor 吉本哲郎松川公
Owner HITACHI LTD