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Server for managing nat associated address information of other servers

An address information and server technology, applied in the server field of port numbers, can solve the problem of not knowing which port number is assigned to which terminal, etc.

Inactive Publication Date: 2005-11-23
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is such a problem in this scheme: a port number is automatically selected, so users on the Internet do not know which port number is assigned to which terminal

Method used

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  • Server for managing nat associated address information of other servers
  • Server for managing nat associated address information of other servers
  • Server for managing nat associated address information of other servers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A server subordinate to one router in Embodiment 1 will be described.

[0047] FIG. 1 is a structural diagram of a network system for accessing a server subordinate to one router in Embodiment 1 of the present invention. Fig. 2 is a structural diagram of a server in Embodiment 1 of the present invention. Fig. 3 is a flow chart of setting a server port in Embodiment 1 of the present invention. Fig. 4 is a flow chart of obtaining port mapping information by a representative server in Embodiment 1 of the present invention. FIG. 5 illustrates the sequence in which a representative server acquires port mapping information in Embodiment 1 of the present invention. Fig. 6 illustrates an operation screen for a representative server in Embodiment 1 of the present invention. Fig. 7 illustrates a flow chart of generating HTML information displayed on a representative server in Embodiment 1 of the present invention. FIG. 8A is a first port forwarding table in Embodiment 1 of th...

Embodiment 2

[0076] Hereinafter, a server that manages port mapping information in Embodiment 2 will be described. Among the plurality of image servers connected to one router, the image server 3a as a representative server periodically inquires the image servers 3b, 3c of the port numbers of the other image servers 3b, 3c. FIG. 9 is a flow chart of obtaining port mapping information by a representative server in Embodiment 2 of the present invention. FIG. 10 illustrates the sequence in which a representative server acquires port mapping information in Embodiment 2 of the present invention. In Embodiment 2, the port arrangement diagram of FIG. 3 is also referred to.

[0077]Steps 1 to 19 of the flow chart of setting the port of the image server in Embodiment 2 are the same as Steps 1 to 19 in Embodiment 1. As shown in FIG. 3, when the image server 3a is powered on (step 1), the port management mechanism 17a transmits a DHCP discovery packet to request the DHCP server 5 to assign an IP ad...

Embodiment 3

[0085] An image server in Embodiment 1 described above periodically queries router 2 for port mapping information. The image server 3a in Embodiment 2 issues a port mapping information batch notification request to the image servers 3b, 3c. An image server in Embodiment 3 does not inquire about the port mapping information, but directly takes out a mapping table of the usage registration information registered in the router 2, and determines the registration entries of the image servers 3b, 3c according to this table.

[0086] The Get Generic Port Map Login action is defined in the UPnP standard called IGD (Internet Gateway Device) DCP (Device Control Protocol). In the mapping table set to the use registration information of the router 2, the IP addresses of the image servers 3a, 3b, 3c corresponding to the external port numbers of the router 2, internal port numbers, and comment statements are stored. The character strings "server 2" and "server 3" which are the host names o...

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PUM

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Abstract

The invention aims at providing a server which manages address information for servers subordinate to a port-forwarding relay device (router) thus allowing an access from a wide area network. A representative server issues a request to assign a default port number to a router. The port management unit of the representative server registered to a default port number acquires the IP address of the router (wide area network address) and port mapping information (port number information on other equipment) from the router and retains the information acquired. In case it is determined that an access from the wide area network is first directed to a representative server, the representative server displays in a list the port number information on the accessing terminal in response to an access from the wide area network. This allows an external user to readily access desired equipment. The representative server periodically makes a port mapping information to the router and updates the information.

Description

technical field [0001] The present invention relates to a server connected to a relay device such as a router, and in particular, the present invention relates to a server to which a port number for port forwarding can be assigned. Background technique [0002] In recent years, ADSL and CATV technologies for continuous connection with a wide area network such as the Internet have been widely used, and broadband routers have become popular. Fig. 15 is a structural diagram of a router with port forwarding capability in the related art. Fig. 16 is an explanatory diagram of a related art port forwarding setting table. [0003] In FIGS. 15 and 16, numeral 101 denotes Internet, 102 denotes a router equipped with a plurality of LAN ports, 103 denotes server A having port number "80" and IP address "192.168.0.253", and 104 denotes server A having port number " 81" and server B with IP address "192.168.0.254". In this manner, router 102 typically connects the Internet to its WAN p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/70H04L12/66H04L29/06H04L29/12
CPCH04L29/1233H04L61/2015H04L29/12462H04L61/15H04L29/12377H04L29/12047H04L61/2517H04L61/255H04L61/45H04L61/25H04L61/5014
Inventor 横光康志大岛智弘
Owner PANASONIC CORP
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