IP device, management server, and network system

Abstract

An IP device (for example, network cameras 3a, 3b, and 3c) connectable to a router (for example, a router 2) makes a request to the router for assignment of a port number when a predetermined operation is performed, and notifies a management server 6 connected to a wide area network of address data containing an assigned port number when the port number is assigned from the router, wherein address data containing the port number can be registered in the management server 6 on the wide area network, so that, even when access is made from the terminal 4 on the wide area network side with a port number that is locally updated, access is made possible by transmitting address data of the IP device to the terminal 4.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to an IP device which can register access data in a management server by being connected to a router and assigned with a port number for port forwarding, a management server which registers this access data and provides address data of this IP device to a terminal that accesses via a wide area network, and a network system comprising these. [0002] ADSL and CATV for constant connection to a wide area network such as the Internet have spread on a full scale, and broadband routers have widely spread. However, with the current IP protocol IPv4, the absolute number of global IP addresses is insufficient, so that the shortage of global IP addresses is covered by using the NAT (Network Address Translation) function and the port forwarding function (static IP masquerade). This NAT function converts a local IP address of a LAN-side device into a global IP address of the WAN side of a router when the LAN-side device accesses the...

AI Technical Summary

Benefits of technology

[0014] Therefore, an object of the invention is to provide a device which can be assigned with a port number for port forwarding and can be accessed from a wide area network side by registering address data in a management server on the wide area network. Furthermore, another object of the invention is to provide a management server which is connected to a wide area network, registers address data of an IP device that has been assigned with a port number for port forwarding to make it easy to access this IP device from the wide area network side.

[0015] In order to achieve the above-mentioned objects, the invention relates to an IP device connectable to a router, which requests the router to assign a port number when a predetermined operation is performed, and when a port number is assigned from the router, notifies a management server connected to a wide area network of address data containing the assigned port number, wherein the IP device is assigned with a port number for port forwarding and can register address data containing the port number that is to be updated in the management server on the wide area network, so that even with a port number that is locally updated, access from the wide area network side can be made. Furthermore, the IP device notifies the management server of IP device data and / or a domain name to be used in the DDNS service in addition to the address data, whereby the IP device is easily specified.

[0016] Furthermore, the management server searches within an IP device management table on the basis of an ID supplied by user authentication and returns page data for displaying a list of IP devices, whereby authentication is performed before the management server transmits page data for displaying a list for specifying an IP device, so that it becomes unnecessary to transmit the IP device list data to unauthorized users, and this reduces the burden on the management server and realizes high security without connection to the IP device itself.

[0017] Furthermore, the IP device requests the router to assign a port number, performs automatic setting concerning the network, and transmits a connection check request meaning a request for connection to itself to the management server and judges the end of automatic setting by an affirmative response that is outputted when the IP device can respond to a connection request from the management server, whereby access from the wide area network side can be made even with a port number that is locally updated, and the end of automatic setting can be reliably judged.

[0018] Furthermore, in a case where an IP device has an image data transmission function and can transmit portal screen display data when it is accessed from a terminal through a network, and can transmit images outputted by itself or other devices within a local area network to external terminals through the network, when the network data is registered by automatic setting, a network data acquiring request is broadcasted, a network data acquiring response is received from other devices within the local area network, and the network data is registered in the display camera management table within the IP device, whereby a plurality of images to be displayed on a portal screen display can be displayed easily in a list.

Problems solved by technology

However, with the current IP protocol IPv4, the absolute number of global IP addresses is insufficient, so that the shortage of global IP addresses is covered by using the NAT (Network Address Translation) function and the port forwarding function (static IP masquerade).

However, since the port number is automatically selected, a user on the Internet side cannot know which port number is assigned to which of the terminals.

From the inside of the LAN, port numbers to be used by each of the terminals can be confirmed by using a user interface (web page) of a router or a terminal, however, from the Internet side (outside), a user interface of a router cannot be used by reason of security.

However, when images of the plurality of network cameras are browsed from a client terminal, the terminal must access the network cameras one by one, and the access time becomes long and this is troublesome and inconvenient.

Furthermore, when port forwarding setting is dynamically made according to the standards of the UPnP forum, a terminal inquires to a router whether a port is usable, and when it is usable, it is registered, and when it is unusable, the terminal repeatedly inquires, however, the router automatically selects a port number, so that a user on the Internet side cannot know which of the port numbers is assigned to the terminal.

The present applicant also proposed an access method by using a representative device, however, in the access method, the port number of the representative device must be fixed, and when a fixed port number is unusable, access to the representative device is impossible, and as a matter of course, access to all devices becomes impossible.

For example, a port number “80” is used for communications by HTTP, however, in a case where this port number is reserved by a router for another use, this port number cannot be assigned to the representative device, so that access becomes impossible.

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