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.
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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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