JPH0738600A - Dynamic address managing method - Google Patents

Abstract

PURPOSE:To connect a terminal to a network while securing security by automatically possessing an address and automatically setting a router. CONSTITUTION:When a new terminal 11 is newly connected to a present subnet 12 and a power source is turned on, at first, the new terminal 11 defines a decided address for initial setting as a present address and transmits a present address possessing packet to all the terminals connected to the present sub net 12 and a present address server 13 by using an address for all the terminals. When the present address possessing packet is received, the present address server 13 retrieves a non-used address from an address managing table and when there is the non-used address, the flag of that address is set under automatic setting. Then, the address retrieved this time is transmitted to the address for initial setting as a present address possessing response packet. At the new terminal 11, the address received from the address server 13 is reset as a present address.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of managing addresses in a network.

[0002]

2. Description of the Related Art In recent years, there has been a tendency to attach a local area network (LAN) in an office to improve work efficiency. Among them, there are many cases where a router is installed to ensure security and the connection with other subnets is restricted. In addition, there is an increasing demand to connect a mobile terminal to a LAN and work without using the mobile terminal or the like anywhere.

A network address management method in the case of performing communication using a conventional router will be described below. FIG. 10 shows a conventional general network configuration. In FIG. 10, 101 is a new terminal to be newly connected, 102 is a local subnet to which the new terminal 101 is connected, 103 is a connection target terminal of a partner with whom the new terminal 101 wants to communicate, and 104 is a partner with whom he wants to communicate. Other subnet with terminal, 105 is own subnet 102
Is connected to the router, 106 is another subnet 104
Is a router connected to. 107 is the router 1
This is a router setting dedicated terminal for performing routing setting such as 05.

Next, a network address management method in the above network configuration will be described. First, in order to connect the new terminal 101 to the own subnet 102, all addresses of other terminals connected to the own subnet 102 are checked, and an address which does not overlap with those addresses is created by the user himself / herself with a file in the new terminal 101. Set by editing. Next, in order for the new terminal 101 to communicate with the target connection target terminal 103 through the router 105 and the router 106, if the routers 105 and 106 have static routing settings, the new terminal 1 is set to the respective routers 105 and 106.
01 and the address of the connection target terminal 103, the user or the LAN administrator uses the router setting dedicated terminal 107,
Address routing table 11 as shown in FIG.
1 is used to set each address. If the router has a dynamic routing setting, the router 10
Nos. 5 and 106 do not need to be set by the user or the LAN administrator because the routing table of the router is automatically set for the transmitted packet.
In this way, by setting the routing settings of the routers in the respective subnets, it becomes possible to communicate with terminals in other subnets.

[0005]

However, in the above method, when changing the installation location of a terminal, all addresses of other terminals connected to the own subnet are checked, and an address that does not overlap with those addresses is checked. It is necessary for the user to change the value by himself, which causes a problem that a great deal of labor is spent for advance preparation. Further, even when the installation location is changed over the subnet, the setting of the router needs to be changed in the case of the static routing setting, which requires a preparation. Furthermore, in the case of dynamic routing, the router automatically sets the routing table of the router, so it is possible to communicate with terminals other than the terminals on the other subnets of interest, which poses a security problem. Had.

The present invention solves the above problems.
To provide a dynamic address management method that allows terminals to be connected to a network without requiring advance preparation by automatically obtaining addresses and automatically configuring router settings, and while ensuring security. The purpose is.

[0007]

In order to achieve the above object, the dynamic address management method of the present invention is such that, for a newly connected terminal, an address server connected to its own subnet is In response to a request, assign an address using the address management table owned by itself,
The terminal to which the address is assigned sends a packet containing the address of the connection target terminal connected to another subnet and its own unique address to the own router connected to the own subnet, and the own router sends this packet. Sends to other routers connected to other subnets, which in turn sends them to other address servers connected to other subnets, which in turn will own address management tables and It is configured such that routing is set by using the address table specific to connectable terminals.

[0008]

According to the present invention, with the above configuration, the acquisition of the address and the change of the routing are automatically performed by the communication between the terminal, the address server and the router, so that the new terminal can be connected to the network while ensuring the security. Can be connected.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A dynamic address management method according to an embodiment of the present invention will be described below with reference to the drawings. Figure 1
FIG. 3 is a network diagram in an embodiment of the present invention. In FIG. 1, 11 is a new terminal to be newly connected, 12 is an own subnet to which the new terminal 11 is connected, 13 is an own address server connected to the own subnet 12, 14 is the new terminal 11 wants to communicate. Target device to connect to, 1
5 is another subnet with the partner terminal you want to communicate with, 16
Is another address server connected to another subnet 15, 17 is a router connected to its own subnet 12,
Reference numeral 18 is a router connected to the other subnet 15.

FIG. 2 shows the configuration of the own address server 13 and the other address server 16 in the above embodiment. In FIG. 2, 21 is each subnet 12,
4, a data receiving unit for receiving data from 15, a searching unit 22 for searching the received data by using an address management table 23 as shown in FIG.
A determining unit for making a determination using the connectable terminal unique address table 25 as shown in FIG. 2 and a data transmitting unit 26 for transmitting a result of the determination to the respective subnets 12, 15.

The address management table 23 shown in FIG.
Addresses and flags are paired to manage addresses in the subnet. Of the flags, 0 is an unused address,
Reference numeral 1 indicates an automatic setting address, 2 indicates an automatic setting address, 98 indicates a router setting address, and 99 indicates an automatic setting prohibition address. In the connectable terminal unique address table 25 of FIG. 4, the address of the partner connection target terminal and the unique address of the terminal connectable thereto are registered as a pair.

Next, the operation of the above embodiment will be described with reference to the flowchart of FIG. 5 when the terminal is newly connected.

When the new terminal 11 is newly connected to its own subnet 12 and the power is turned on, the new terminal 11 first receives the determined initial setting address 144.123.
111.1 is used as the own address (step 51), and all terminals connected to the own subnet 12 and own address server 13 have addresses 144.12 for all terminals in FIG.
The own address acquisition packet is transmitted using 3.111.25 (step 52). The own address server 13
When the own address acquisition packet is received, an unused address is searched from the address management table 23 of FIG. 3 (step 53), and if there is an unused address, the address 144.123.111.4 is acquired as shown in FIG. Is set to "2" during automatic setting (step 54), and the address 144.123.111.4 just searched is transmitted as the own address acquisition response packet to the initial setting address 144.123.111.1. (Step 55). In the new terminal 11, the address 144.123.111.4 received from the address server is reset as its own address (step 56), and when the setting is completed, the address setting end packet is transmitted to the address server 13 (step 57). ). Upon receiving the address setting end packet, the address server 13 determines that the address setting is completed in the new terminal 11, and as shown in FIG. 7, the flag of the address management table 23 is automatically set to “1”. "(Step 58). If the address setting end packet is not returned within 5 seconds from the own address acquisition response packet, it is considered that the address setting has failed in the new terminal 11, and the flag of the address management table is returned to unused “0”. The address server 13
When the terminal confirmation request packet is transmitted to the address currently in use for automatic setting every 10 seconds and the response terminal confirmation response packet is not returned within 5 seconds, the new terminal 11
Address management table 2
The flag of 3 is returned to unused "0".

Next, with reference to FIG. 8, a procedure for automatic router setting when communicating with a terminal on another subnet will be described. The new terminal 11 to which the own address 144.123.111.4 can be set is the address 144.123.112.4 of the connection target terminal 14 with which communication is desired and the terminal unique address 32.44.1. 32.
A routing setting packet including 43.11 is transmitted to all the terminals connected to the own subnet 12 by using the all-terminal address 144.123.111.255 (step 81). Upon receipt of the routing setting packet, the router 17 of its own subnet 12 asks the router 18 of the other subnet 12 as the connection destination to confirm the connection status of the connection target terminal 14 with the terminal unique address 3 of the new terminal 11.
2.44.12.32.43.11 and the connection target terminal 14
A terminal connection confirmation packet including the address 144.1123.112.4 is transmitted (step 82). Upon receipt of this, the router 18 confirms whether or not the address 144.123.112.4 of the connection target terminal 14 requested by the other address server 16 in the other subnet 15 is used. Terminal unique address 3 of terminal 11
2.44.12.32.43.11 and the connection target terminal 14
The terminal connection confirmation packet including the address 144.1123.112.4 is transmitted (step 83). On the other hand, the other address server 16 searches the address management table 23 (step 84), and as shown in FIG. 9, determines whether the flag of the address 144.123.112.4 of the connection target terminal 14 is "98". Check (step 85),
Next, referring to the connectable terminal unique address table 25 of FIG. 4, the terminal unique address of the new terminal 11 is 32.4.
It is checked whether 4.12.32.43.11 is registered as connectable with the address 144.1123.11.2.4 of the connection target terminal 14 (step 86), and if registered, a connection permission packet is sent. The packet is transmitted to the router 18 (step 87), and otherwise, a connection disapproval packet is transmitted to the router 18 (step 88). When the router 18 receives the connection disapproval packet, the router 18 directly transmits the connection disapproval packet to the router 17 (step 8).
9) If the connection permission packet is received, the connection permission packet is transmitted to the router 17 (step 90),
Set the routing setting of the local router to the source address 14
4.123.111.4 is the packet whose destination is the address 144.123.112.4, and the packet whose source address is 144.123.112.4 is the destination address 144.123.111. The routing is set so that both of the four packets can pass (step 91). When the router 17 receives the connection prohibition packet from the router 18, the router 17 terminates without doing anything. When the connection permission packet is received, the same routing setting as the router 18 is performed (step 92).

As described above, according to the above-described embodiment, when the installation location of the terminal is changed, the settings of the terminal and the router are automatically changed, so that the user does not have to make the terminal setting and the router setting. , It is possible to easily communicate with the target terminal.

[0016]

As described above, according to the present invention, the setting of the terminal or the router can be automatically changed, and when the user changes the installation place of the terminal, the setting of the terminal or the router can be changed. It is possible to realize an excellent dynamic address management method in which setting work of a router can be omitted and highly secure communication can be performed only to a target terminal.

[Brief description of drawings]

FIG. 1 is a network configuration diagram to which a dynamic address management method according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram of an address server according to the embodiment.

FIG. 3 is a schematic diagram of an address management table in the same embodiment.

FIG. 4 is a schematic diagram of a connectable terminal unique address table in the embodiment.

FIG. 5 is a flowchart in the case of assigning an address to a new terminal in the embodiment.

FIG. 6 is a schematic diagram showing changes in the contents of the address table when an address is assigned to a new terminal in the embodiment.

FIG. 7 is a schematic diagram showing changes in the contents of an address table when an address is assigned to a new terminal in the embodiment.

FIG. 8 is a flow chart in the case of performing routing setting on the router in the embodiment.

FIG. 9 is a schematic diagram showing changes in the contents of the address table when routing settings are made in the router in the embodiment.

FIG. 10 is a conventional network configuration diagram.

FIG. 11 is a schematic diagram showing a conventional address routing table.

[Explanation of symbols]

 11 New Terminal 12 Own Subnet 13 Own Address Server 14 Connection Target Terminal 15 Other Subnet 16 Other Address Server 17 Router 18 Router

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G06F 15/177

Claims (3)

[Claims] 1. An address server connected to its own subnet assigns an address to a newly connected terminal using an address management table owned by itself, in response to a request from the terminal. Characteristic dynamic address management method. 2. A newly connected terminal transmits a packet including an address of a connection target terminal connected to another subnet and its own unique address to its own router connected to its own subnet, Your router sends it to other routers connected to other subnets, which sends it to other address servers connected to other subnets, which you own. A dynamic address management method characterized in that routing is set using an address management table and a connectable terminal specific address table. 3. An address server connected to its own subnet assigns an address to a newly connected terminal using an address management table owned by itself, in response to a request from the terminal. , The terminal to which the address is assigned transmits a packet including the address of the connection target terminal connected to another subnet and its own unique address to the own router connected to the own subnet, and the own router Send this to other routers connected to other subnets, which in turn sends it to other address servers connected to other subnets,
Another address server is a dynamic address management method characterized by performing routing setting using an address management table owned by itself and a connectable terminal specific address table.