DDNS server, a DDNS client terminal and a DDNS system, and a web server terminal, its network system and an access control method

• US 20030177236A1
• Filed: 03/17/2003
• Published: 09/18/2003
• Est. Priority Date: 03/18/2002
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Muta, Michihiro, Goto, Hironori, Nawata, Akihiro
• Granted Patent: US 7,529,810 B2
• Time in Patent Office: Days
• US Class Current: 709/225
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/45 Network directories; Name-to-address mapping
• CPC Class Codes: H04L 61/50 Address allocation

Abstract

The present invention aims at providing a DDNS server, a DDNS client terminal and a DDNS system which maintains high security while using DHCP and allows an access to terminals having the same IP address as well as data updates. The DDNS server includes a terminal management table storing the domain name, global IP address and port number of a DDNS client terminal, characterized in that the terminal management section checks whether a same global IP address is present in the terminal management table when a request to overwrite a global IP address is made from a DDNS client terminal and, in case the same global IP address is absent, permits overwriting of the global IP address, and in case the same global IP address is present, checks the port number, and in case the same port number is detected, inhibits overwriting of the global IP address, and in case the port number is different, permits overwriting of the global IP address.

Claims

1. A DDNS server comprising a terminal management table storing the domain name, global IP address and port number of a DDNS client terminal and

a terminal management section for managing said terminal management table,

characterized in that said DDNS server receives a domain name, a global IP address and a port number transmitted from said DDNS client terminal in accordance with an update request from the DDNS client terminal and overwrites said terminal management table.

3. A DDNS server according to claim 1 or 2, characterized in that authentication information is stored in said terminal management table and that said terminal management section compares the authentication information stored in said terminal management table with that in a header to determine whether the access is an authorized access.

4. A DDNS server according to claim 3, characterized in that said authentication information is the MAC address of the DDNS client terminal.

5. A DDNS server according to any one of claims 1 through 4, characterized in that said terminal management section periodically receives an update notice from the DDNS client terminal.

2. A DDNS server comprising a terminal management table storing the domain name, global IP address and port number of a DDNS client terminal and a terminal management section for managing said terminal management table,

characterized in that the terminal management section checks whether a same global IP address is present in the terminal management table when a request to overwrite a global IP address is made from a DDNS client terminal and, in case the same global IP address is absent, permits overwriting of the global IP address, and in case the same global IP address is present, checks the port number, and in case the same port number is detected, inhibits overwriting of the global IP address, and in case the port number is different, permits overwriting of the global IP address.

6. A DDNS client terminal characterized in that said DDNS client terminal comprises a DDNS management table storing a domain name, a global IP address, a port number and update interval information and

DDNS management means for managing said DDNS management table and periodically updating the global IP address and/or domain name in accordance with said update interval information.

7. A DDNS client terminal according to claim 6, characterized in that authentication information is stored into said terminal management table and that

said DDNS management means writes authentication information into a header before transmission when a global IP address overwrite request is made.

8. A DDNS client terminal characterized in that said authentication information is a MAC address.

9. A DDNS system comprising a DDNS client terminal including a DDNS management table storing a domain name, a global IP address, aport number and update interval information and DDNS management means for managing the DDNS management table and periodically updating the global IP address and/or domain name in accordance with said update interval information and

a terminal management table storing the domain name, global IP address, and port number of said DDNS client terminal and a DDNS server including a terminal management section for managing said terminal management table,

characterized in that said DDNS system checks whether a same global IP address is present in the domain when a request to overwrite a global IP address is made from said DDNS client terminal to the DDNS server and, in case the same global IP address is absent, permits overwriting of the global IP address, and in case the same global IP address is present, checks the port number, and in case the same port number is detected, inhibits overwriting of the global IP address, and in case the port number is different, permits overwriting of the global IP address.

10. A DDNS system according to claim 9, characterized in that authentication information is stored into said terminal management table, that

said DDNS management means writes authentication information into a header before transmission when said DDNS client terminal makes a global IP address overwrite request and that

said terminal management section of said DDNS server compares the authentication information stored in said terminal management table with that in the header to determine whether the access is an authorized access.

11. A DDNS system according to claim 10, characterized in that said authentication information is a MAC address.

12. A DDNS system according to any one of claims 9 through 11, characterized in that said terminal management section periodically receives an update notice from the DDNS client terminal.

13. A web server terminal comprising a management table for storing its own host name,

web processing means for processing a request from a web client terminal, and

host name detection means for extracting a host name from an HTTP header on receipt of an access request transmitted from the web client terminal, and

determination means for comparing the host name detected by said host name detection means with the host name stored in said management table and checking whether they match each other,

characterized in that said determination means allows web processing means to perform communications in case the host names match each other, and rejects communications in case the host names do not match each other.

14. A web server terminal according to claim 13, characterized in that said host name detection means extracts the host name of the web server terminal in accordance with the HTTP request header method set to an access request transmitted from the web client terminal.

15. A web server terminal according to claim 13 or 14, said web server terminal provided with DDNS management means, characterized in that said DDNS management means stores its host name acquired from said DDNS server into said management table.

16. A network system comprising a web server terminal according to any one of claims 13 through 15, a web client terminal, a DDNS server for converting a host name and an IP address on a request from said web server terminal, and a DHCP server for assigning an IP address to said web server terminal starting with a predetermined IP address,

characterized in that said web client terminal comprises browser means for accessing the web server terminal and requesting for a predetermined transaction on the web and an HTTP request generation means for setting the host name of the web server terminal in the HTTP request included in an access request in accessing said web server terminal by way of said browser means,

that said web client terminal appends a host name to the access request, and that said web server terminal compares the host name with the registered host name and permits connection only in case the host names match each other.

17. An access control characterized in that the web client terminal sets a host name to an access request in accessing the web server terminal by way of browser means and that the web server terminal extracts the host name, compares the host name with the registered host name, and permits connection in case the host names match each other and rejects connection in case the host names do not match each other.