JP2002152253A - Communication management system, communication terminal, and communication management method, and program storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication management system and a communication management method that can automatically set a host name. SOLUTION: Upon receiving request for an IP address from a host, the IP address and the host name are automatically assigned, on the basis of a list or attribute generated in advance. Furthermore, an FQDN(fully qualified domain name) management unit registers the correspondence of the FQDN, including an IP address set to the host and the host name. Through the configuration above, even when the IP address to the host is revised, the host can be accessed with the same host name. Thus, even in an environment where the IP address is dynamically changed, communication using the host name and the FQDN is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a communication management system, a communication terminal, a communication management method, and a program storage medium. More specifically, the present invention relates to a communication management system, a communication terminal, a communication management method, and a program storage medium that can automatically assign a host name to each host.

[0002]

2. Description of the Related Art At present, in the Internet which has been explosively popularized, IP (Intern) is used as a routing protocol.
et Protocol) has been used. The currently used IP is IPv4, and a 32-bit address (IP address) is used as a source / destination.
In Internet communication, a global IP address that uniquely assigns a 32-bit IP address to each source / destination is adopted, and each source / destination is determined according to the IP address. However, the world of the Internet is rapidly expanding, and the limited address space of IPv4, that is, the depletion of global addresses has become a problem. IETF to solve this
(Internet Engineering Task Force)
From 32 bits to 1 for IP address space as P address
It proposes a new IPv6 that extends to 28 bits.

As a method for expanding the address space while using the current IPv4, a method using a private address has been proposed. Private addresses, unlike global addresses, are addresses used within certain organizations. For example, an arbitrary number of private addresses can be set within a certain corporate organization, and private addresses can be assigned to individual employee terminals. When this private address is used, it is necessary to convert it to a global IP address when connecting to the outside. NAT (Network Address Tran
slator).

For example, one global IP address is obtained from an ISP (Internet Service Provider) and
DHCP (Dynamic Host Configuration Pro)
There is a method of managing private IP addresses by a server. This method uses LAN (Local Area Network)
(ork) When transmitting a packet from inside to a WAN (Wide Area Network), this is a method in which the source (src) address of the IP header is converted into a global IP address of the SOHO router by the SOHO router.

[0005] The IP address is expressed by expressing a 32-bit address in units of 8 bits in decimal notation.
The NAT assigns a preset number of global addresses to packets from the connection terminal on a first-come, first-served basis.
As an automatic setting method of the IP address, I
P address assignment is widespread. This is because DHCP manages multiple IP addresses and DH
This is a method in which the DHCP server selects an IP address by making an inquiry to the CP server and sets it as the terminal IP address. In this method, an IP address is assigned only to an operating terminal, so that effective use of address resources is possible. Since addresses are collectively managed by a server, user setting mistakes and address duplication hardly occur. Thus, communication by TCP / IP becomes possible only by connecting the host to the TCP / IP network.

As described above, an IP address is represented by a 32-bit address represented by a decimal number in units of 8 bits. Such a sequence of numbers is difficult for the user to remember. For this reason, DNS for enabling communication using a host name instead of an IP address
(Domain Name System) is used.

A DNS server manages the correspondence between the IP address of a terminal (host) and a host name, and obtains a host address (IP address) based on the host name by accessing the DNS server when the terminal performs communication. Can be.

As described above, a user often uses a host name to designate a communication partner, but it is necessary to convert the host name into an IP address in order to actually start communication. This conversion process is executed by the DNS. Previously, the administrator manually registered the correspondence between the host name and the IP address in the DNS server, but now several techniques for automating this registration work have been proposed.

For example, RFC 2137 and draft-i
etf-dhc-dhcp-dns-12. In txt etc., DHCP server and DHCP client are DNS
While cooperating with the server, DNS A record (host name →
IP address translation entry) or PTR record (IP
A method of updating the address → host name conversion entry) has been proposed. However, these methods have a problem that the user must set a host name in the DHCP client in advance. draft-i
etf-dhc-dhcp-dns-12. In txt, if the host name is not set in the DHCP client, or if the set host name is inappropriate,
The document states that the HCP server determines an appropriate host name, but does not define a specific determination method.

In Japanese Patent Application Laid-Open No. 2000-112852,
The DHCP server sends the DHCP client's IP address and MAC (Media Access Control).
l) By notifying the DNS server of the address,
A method for updating the registration information of the NS server is described. In this method, the DNS server administrator sets the MAC
By setting a fixed correspondence between the address and the host name, the host name of the DHCP client can be determined. Therefore, there is still a problem that the host name cannot be automatically determined.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and executes a host name correspondence process by an administrator for a host connected to a network. Communication management system that is not needed,
It is an object to provide a communication terminal, a communication management method, and a program storage medium.

Further, the present invention provides a method for controlling the attribute and unique ID of a host.
D, a unique host name is automatically assigned, the determined host name is notified to the corresponding host, and FQDN (Fully Qualified) such as a domain name system is used.
A communication management system, a communication terminal, a communication management method, and a program storage medium that do not need to execute host name correspondence processing by an administrator by transmitting a new FQDN registration / update request to a domain name (management name) management device. The purpose is to provide.

[0013]

SUMMARY OF THE INVENTION A first aspect of the present invention is as follows.
An IP address assignment device that sets an IP address for the host in response to an IP address setting request from the host, a host name assignment device that sets a host name for the host, an IP address set by the IP address assignment device, There is provided a communication management system comprising: an FQDN management device that has a database in which a host name set by the host name assignment device is associated with the host name and that executes access management by the host name.

Further, in one embodiment of the communication management system of the present invention, the host name allocating device has a database listing a plurality of host name candidates, and sets a host name selected from the database to the host. It is characterized by having a configuration.

Further, in one embodiment of the communication management system of the present invention, the host name assigning device has a database listing host attributes and a plurality of host name candidates, determines the attributes of the host, and determines the attributes of the host. The host is configured to set a host name selected from host name candidates corresponding to the attribute to the host.

Further, in one embodiment of the communication management system of the present invention, the host name allocating device is configured to set a host name selected from a host name candidate list of the host to the host.

Further, in one embodiment of the communication management system of the present invention, the host name allocating device matches a host name candidate to be set in a database in which the host name and the IP address of the FQDN management device are associated. The host name candidate is set to a host on condition that there is no data entry with a different registered host.

Further, in one embodiment of the communication management system of the present invention, the host name assigning device has a database listing a plurality of host name candidates, and matches a host name selected from the host name candidate list. If the host name to be registered is registered as data of a different host in a database in which the host name of the FQDN management device is associated with the IP address, a different host name candidate newly selected from the host name candidate list, or The system is characterized in that correction data of the host name selected from the name candidate list is selected as a new host name candidate and an inquiry to the database is executed.

Further, in one embodiment of the communication management system of the present invention, the FQDN management device includes a new IP address allocation device and a new host name allocation device.
In accordance with the setting of the P address and the host name, the system is configured to execute a process of registering, in the database, an entry in which the IP address and the host name are associated with each other in the database.

Further, a second aspect of the present invention is a communication terminal accessible via a network by an IP address and a host name, comprising a host name candidate list set for the communication terminal, A communication terminal having a configuration for executing a host name setting request by transmitting the host name candidate list to an apparatus.

Further, in one embodiment of the communication terminal of the present invention, the communication terminal is an access terminal that can be accessed via a network by an IP address and a host name, has an attribute identifier of the communication terminal, and The apparatus is characterized in that a host name setting request is executed by transmitting the attribute identifier.

Further, according to a third aspect of the present invention, in response to an IP address setting request from a host, an I
An IP address setting step of setting a P address, a host name setting step of setting a host name for the host, and associating the IP address set in the IP address setting step with the host name set in the host name setting step And a registration step of registering the information in a database.

Further, in an embodiment of the communication management method according to the present invention, the host name setting step sets a host name selected from a database listing a plurality of host name candidates to the host.

Further, in one embodiment of the communication management method of the present invention, the host name setting step determines a host attribute, and corresponds to the host attribute and a plurality of host name candidates in the database. A host name selected from host name candidates is set as a host.

Further, in one embodiment of the communication management method of the present invention, the host name setting step sets a host name selected from a host name candidate list of the host to the host.

Further, in one embodiment of the communication management method according to the present invention, the host name setting step includes checking that the database has no data entry that matches a host name candidate to be set and has a different registered host. The host name candidate is set as a condition as a condition.

Further, in one embodiment of the communication management method of the present invention, the host name setting step includes the step of: determining a host name that matches a host name selected from a host name candidate database listing a plurality of host name candidates. When registered as data of a different host in the FQDN database in which the host name and the IP address are associated with each other, a different host name candidate newly selected from the host name candidate list, or a host name selected from the host name candidate list Is selected as a new host name candidate and an inquiry is made to the FQDN database.

Further, a fourth aspect of the present invention is a program storage medium for providing a computer program for causing an IP address and host name setting process to be executed on a computer system, wherein the computer program is transmitted from a host. An IP address setting step for setting an IP address for the host in response to the IP address setting request, a host name setting step for setting a host name for the host, the IP address and the host name set in the IP address setting step A registration step of registering the host name set by the allocating device in a database in association with the host name.

The program storage medium according to the fourth aspect of the present invention is, for example, a medium for providing a computer program in a computer-readable format to a general-purpose computer system capable of executing various program codes. It is.

Such a program storage medium defines a structural or functional cooperative relationship between the computer program and the storage medium for realizing the functions of a predetermined computer program on a computer system. Things. In other words, by installing the computer program into the computer system via the storage medium, a cooperative operation is exerted on the computer system, and the same operation and effect as the other aspects of the present invention can be obtained. You can do it.

Still other objects, features and advantages of the present invention are:
It will become apparent from the following more detailed description based on the embodiments of the present invention and the accompanying drawings.

[0032]

FIG. 1 shows an example of the configuration of a system according to an embodiment of the present invention. The elements constituting the present invention include an IP address allocating device 1, a host name allocating device 2,
QDN (Fully Qualified Domai)
n Name) management device 3. In addition, the hosts 4 and 5 are illustrated in FIG. 1 as hosts requesting the assignment of host names. Although only two hosts are described in FIG. 1, this does not limit the number of hosts to two.

The IP address assignment device 1 manages a plurality of assignable IP addresses, sets an IP address according to a request from the host, and notifies the host. The host name assigning device 2 manages a plurality of assignable host names, and sets a host name for a host for which an IP address is set according to a request from the IP address assigning device 1.
The FQDN management device 3 manages the association between the IP address set by the IP address assignment device 1 and the host name set by the host name assignment device 2, and obtains an IP address based on the host name in communication using the host name. Execute

In FIG. 1, all devices and hosts are connected through a single LAN, but may alternatively be interconnected by a network including a router.
On one computer, any two of an IP address assignment device 1, a host name assignment device 2, and an FQDN management device 3,
Alternatively, all three may be operating. In short, it is only necessary that these three functions can communicate with each other.

With reference to the system configuration of FIG. 1 and the processing sequence diagram shown in FIG. 2, the automatic assignment of the host name in the system of the present invention will be described.

(1) First, each host (ex. Host 4 and host 5 in FIG. 1) attempting to execute communication sends an IP address (host address) allocation request to be used by itself.
The address is transmitted to the address assignment device 1.

(2) I receiving the IP address assignment request
The P address assignment device 1 selects one from a plurality of IP addresses managed by itself and sets it as the IP address of the host. Further, the IP address assigning device 1 transmits a request for assigning the host name of the host for which the IP address has been set to the host name assigning device 2.

(3) Upon receiving the host name assignment request from the IP address assignment device 1, the host name assignment device 2
The inquiry to the QDN management device 3 and the IP address assignment device 1 is repeated to determine the host name to be assigned. The determined host name is sent back to the IP address assignment device 1. A specific example of the host name assignment processing will be described later.

(4) Upon receiving the host name determined by the host name allocating device 2, the IP address allocating device 1 notifies the determined host name and the IP address to the corresponding host that has made the IP address allocation request, and performs the FQDN management device. Then, a request for registration / update of the determined host name is transmitted. F
The QDN management device 3 manages the association between the IP address set by the IP address assignment device 1 and the host name set by the host name assignment device 2, and obtains an IP address based on the host name in communication using the host name. Execute

Next, the configuration of each device will be described. I
The P address allocating apparatus 1 processes an IP address allocation request from a host, that is, executes IP address allocating processing for selecting one of the IP addresses managed by the IP address allocating apparatus 1 and setting the selected IP address as the host IP address. Unit 11, a host name assignment requesting unit 12 for transmitting a host name assignment request to the host name assignment device 2, an assignment status answering unit 13 responding to an IP address assignment status inquiry sent from the host name assignment device 2, and an IP address assignment status. It includes an IP address assignment database 14 to be managed, an FQDN registration / update request unit 15 that notifies the FQDN management device 3 of the host name assigned by the host name assignment device 2, and the like.

The host name allocating device 2 includes a host name allocating unit 21 for actually allocating a host name, an allocation status querying unit 22 for inquiring the IP address allocating device 1 of an IP address allocation status, and a host name corresponding to the attribute identifier of the host. Host name candidate list database 2 that manages candidate lists
3. It has an FQDN inquiry unit 24 for inquiring the FQDN management device 3 about the registration status of the host name when managing the assignment of the host name.

The FQDN management unit 3 includes an FQDN registration / update processing unit 31 for receiving and processing an FQDN registration / update request, an FQDN answer unit 33 for processing an inquiry about the use status of the FQDN sent from the host name assignment device, The FQDN management database 32 referred to from the FQDN.

FIG. 3 shows an example of the IP address assignment database 14 of the IP address assignment apparatus 1. As shown in FIG. 3, the IP address assignment database stores the host identifier (ID-x) of each host and the IP address assigned to each host.
It has a configuration in which each data of the address (IP-x) and the expiration time (T-x) of the assigned IP address is associated.

The IP address assignment device 1 registers the IP address set based on the IP address assignment request from each host in the IP address assignment database.

FIG. 4 shows an example of the host name candidate list database 23 of the host name allocating apparatus 2. The host name candidate list database has an attribute identifier (Type-x)
And a host name candidate (HN-xx). The attribute identifier is the attribute of the host to which the host name is assigned,
For example, an attribute indicating a function as a host such as a PC, a server, a printer, and a TV, or a host such as a floor 1 or a floor 2 or a section 1 or a section 2 when a management terminal is located in each department of the company. Is an identifier for classifying the terminal as a certain category. The host name candidate (HN-xx) is a candidate list of host names to be set for hosts belonging to the associated attribute identifier (category). For example, when the attribute identifier is PC, PC-01, PC-02, and the like are set as the host name candidates.

FIG. 5 shows an example of the FQDN management database 32 included in the FQDN management device 3. The FQDN management database is registered with respect to a host to which an IP address and a host name have been assigned, and has a configuration in which a host identifier, FQDN (DN-x), which is the entire description domain name, and an IP address are associated with each other. Note that the FQDN (DN-x), which is the entire description domain name, includes a host name, a domain name, a subdomain name, and the like.

Next, referring again to FIG. 2, for processing other than the host name selection, the IP with the host name candidate list from the host 4 of FIG. The process [process a] for the address assignment request, and the IP with the attribute identifier from the host 5 of FIG. 1 holding the host identifier 52 and the attribute identifier 53
The process [process b] for the address assignment request will be described in detail as an example.

[Process a] (a1) The host 4 has the host identifier 4 as shown in FIG.
3 and a host name candidate list 42. An example of the host identifier 43 is a MAC address. The candidate list 42 must include at least one candidate host name. However, the contents of the candidate list 42 may be changed by the user.

(A2) The IP address assignment request unit 41 of the host 4 includes the host identifier 43 and the candidate list 42 in the IP address assignment request sent to the IP address assignment device 1. The host name assignment request unit 12 of the IP address assignment device 1 that has received the IP address assignment request requests the host name assignment unit 21 of the host name assignment device 2 to assign a host name. This host name assignment request includes the host identifier 43 and the candidate list 42 transmitted from the host 4.

(A3) The host name assigning device 2 determines a host name to be assigned using the host identifier 43 and the host name candidate list 42, and notifies the IP address assigning device 1 of the determined host name. At the same time, the determined host name is
DN (Fully Qualified Domain)
Name), and requests the FQDN management device 3 to update / register. The expansion from the host name to the FQDN is realized by adding a domain name (for example, sony.co.jp) set in the host name assignment device 2 in advance. Alternatively, deployment to FQDN may be performed by the FQDN management device 3. In this case, the domain name to be added is set in the FQDN management device 3.

[Process b] (b1) In the case of a host that does not hold a host name candidate list such as the host 5, an attribute identifier 53 and a host identifier 52 (equivalent to the host identifier 42) representing the type of terminal are used instead.
To the IP address assignment device 1. In this case, IP
The address assignment device 1 has an attribute identifier 53 and a host identifier 5
2 is transmitted to the host name assignment device 2.

(B2-1) When the host name assignment request includes the attribute identifier 53 instead of the host name candidate list, the host name assignment device 2 sets the host name candidate list database 2
3 (see FIG. 4), a list corresponding to the attribute identifier 53 is extracted and used. If there is no corresponding list,
Use the default list. The default is a field for associating a host name candidate set when there is no attribute identifier corresponding to the received attribute identifier.

In FIG. 1, the IP address allocating apparatus 1 and the host name allocating apparatus 2 are shown as separate components, but the function of the host name allocating apparatus 2 may be provided in the IP address allocating apparatus 1. Alternatively, the IP address assigning apparatus 1 may perform conversion to a host name based on the attribute identifier received from the host 5. In this case, the host name candidate list database 23 shown in FIG.

Next, the determination of the host name executed by the host name assigning device 2 and the F executed by the FQDN management device 3
The details of the QDN registration / update processing will be described. Note that the processing described below corresponds to the sequence diagram of FIG. 6 or FIG.

(C1) Upon receiving the host name assignment request from the IP address assignment device 1, the host name assignment device 2 gives priority to the same host name as the one previously assigned to the host to which the host name is assigned. To assign to
The host name assignment device 2 requests the FQDN management device 3 to inquire the FQDN management database 32 (FQDN inquiry). The FQDN inquiry includes the host identifier A received from the host via the IP address assignment device 1.

(C2) FQDN which received FQDN inquiry
The FQDN reply unit 33 of the management device 3 stores the host name previously assigned to the FQDN management database 32 (old host name:
PastName), the old host name (Pa
stName) is returned to the host name assignment device 2. Upon receiving this message, the host name assignment device 2 determines the host name to be assigned as the old host name (PastName),
Proceed to (c14).

(C3) In the case where the host name is not reassigned or the entry corresponding to the FQDN management database 32 is not included, the fact that no entry was found is returned to the host name assigning device 2.

(C4) The host name allocating apparatus 2 is the first one included in the candidate list sent from the host or the host name candidate list converted (selected) from the attribute identifier based on the host name candidate list shown in FIG. Host name candidate H
Take out N.

(C5) The host name allocating apparatus 2 needs to confirm whether or not the host name candidate HN has already been registered and used. As this process, the host name assignment device 2 uses the FQDN inquiry unit 24 to inquire the FQDN response unit 33 whether or not the FQDN is included in the FQDN management database 32 of the FQDN management device 3. The inquiry message includes the host name candidate HN and the host identifier A. The FQDN answer part 33 is the FQDN management database 3
2 is checked, and the result is returned to the FQDN inquiry unit 24. At the time of inquiry, the host name candidate HN is added with the domain name in advance to facilitate comparison with the FQDN registration data in the FQDN management database (see FIG. 5).
It is expanded to FQDN candidate DNs described as N. The expansion is performed by the host name management device 2 or the FQDN management device 3.

(C6) If the FQDN candidate DN generated based on the host name candidate HN has not been registered in the FQDN management database 32, no duplicate registration will be made and the host name to which the host name candidate HN is assigned Determined and proceed to (c14). The above processing corresponds to the processing in the sequence diagram of FIG.

(C7) If the FQDN candidate DN developed from the host name candidate HN is included in the FQDN management database 32, the FQDN management device 3 sends the host identifier ID-1 corresponding to the FQDN candidate DN in the FQDN management database 32. Is returned to the host name assignment device 2. The host name assignment device 2 compares ID-1 with the host identifier A. If ID-1 and the host identifier A are equal, the FQDN candidate DN including the host name HN is:
Since the host name has already been assigned to the same host, it is determined that the selected host name is to be assigned, and the process proceeds to (c14). The situation of the message exchange in this case is also as shown in FIG.

(C8) If the host identifier A transmitted by the host is not equal to the host identifier ID-1 corresponding to the FQDN candidate DN in the FQDN management database 32, the host name candidate HN has already been registered by another host. Means that you have. In this case, the IP address assignment apparatus 1 is inquired of the expiration date of the IP address assigned to the host specified by ID-1 via the assignment status inquiry unit 22. The assignment status response unit 13 refers to the IP address assignment database 14 (see FIG. 3) and replies with the corresponding expiration date. If there is no IP address assignment record corresponding to ID-1, a reply is sent to that effect.

(C9) If a response indicating that there is no IP address assignment record corresponding to the host identifier ID-1 corresponding to the FQDN candidate DN in the FQDN management database 32 or the validity period has expired, the host is rejected. Means that the host name HN assigned to has already been invalidated and can be newly registered. in this case,
It is determined that the host name is to be reused, and the process proceeds to (c14). The state of the message exchange in this case is as shown in FIG.

(C10) FQDN management database 32
If the assignment record of the IP address corresponding to the host identifier ID-1 corresponding to the FQDN candidate DN is within the validity period or the host name is not reused, the next host name is extracted from the host name candidate list, The process returns to (c5) as the host name HN.

(C11) As a result of repeating the processes of c5 to c10, if all the candidates included in the host name candidate list cannot be used, the host name candidate list (see FIG. 4) is again read from the host name candidate list. The name candidate (HN-x1) is extracted and modified, and a new host name HN is set to (c
Return to 5). As an example of the host name candidate correction, a method of adding a character string representing a number as a suffix to the end can be considered. An alphabet or word may be added instead of a number, or a method of adding a prefix instead of a suffix.

(C12) Correction and checking are repeated until a candidate for a host name that is not in use is obtained. For example, $ La as the first candidate in the host name candidate list (see FIG. 4)
If ptop is in use, {Laptop1
Test whether ≡ can be used. If {Laptop1} cannot be used, {Laptop2} is tested, and so on.

(C13) At this time, the candidates HN-1 to HN-
If there are n candidates up to n, only one of them may be corrected repeatedly, or the correction may be repeated in order. That is, for example, if the host name candidate is $ Laptop
≡, {Desktop}, {PDA}, ≡
Laptop1≡ → Laptop2≡ → Lapto
As in p3 繰 り 返 し → 修正, one candidate may be corrected and the check may be repeated, or {Laptop1≡ → ≡De
The check may be repeated while exchanging a plurality of candidates, for example, sktop1 →→ PDA1 →→. If you use a numeric suffix, you will always get an available host name.

(C14) The host name assigning device 2 assigns the host name determined by the above procedure to the IP address assigning device 1
Notify. The IP address assignment device 1 that has received the notification,
The IP address is assigned to the corresponding host, and the IP address assignment database 14 (see FIG. 3) is updated. At the time of allocation, the determined host name may be notified to the host to be allocated.

(C15) The IP address assigning apparatus 1 determines the determined host name and IP address and the host identifier A
Are notified to the FQDN registration / updating unit 31. FQD
N registration / updating unit 31 is an FQDN management database 32
(See FIG. 5) or update. This registration
The update method is a dynamic DNS method (RFC 213
7). Further, when another entry having the host identifier A is registered in the FQDN management database 32, the entry is deleted from the FQDN management database 32.

As described above, according to the system of the present invention, when an IP address is requested from a host, it is possible to automatically assign a host name together with an IP address. By registering the correspondence of FQDN including FQDN in the FQDN management device, even if the IP address for the host is changed, it is possible to access with the same host name. When this is applied, for example, the following applications are possible.

A specific use example of the system having the automatic host name setting registration configuration of the present invention will be described. It is assumed that a client on the WAN side such as the Internet is trying to access, via an external network, a host in a system in which the above-described host name and IP address are automatically set.

First, the Web server obtains a copy of the FQDN management database from the FQDN management device. We
The server b returns a list of hosts when a certain URL is accessed. FIG. 8A shows an example of a host list displayed on the Web browser. The host list in FIG.
This is a display of the host name extracted from the FQDN registered in the FQDN management database. In the example of FIG. 8, desktop1, desktop2,... Are FQDNs.
Indicates that the host is registered in the management database.

The client on the WAN side is the client of W shown in FIG.
When an arbitrary host name in the host list display list on the web browser is clicked, a list of services provided by the corresponding host shown in FIG. 8B is displayed. When an arbitrary service in the service list is selected, an application corresponding to the service is activated and becomes accessible.

In this example, a service list in HTML including a list of RTSP, FTP, etc. as a service of the host is displayed. The HTML service list includes a link for acquiring meta information of each service provided by various hosts.

Note that the HTML of the service list described above is used.
May be generated when a request is received from a client on the WAN side of the network, or may be created in advance and
It may be stored in the server b.

Next, the user operating the WAN side terminal
The user operates the HTML service list shown in FIG. 8B to determine the service he / she wants to use, and clicks a link for obtaining meta information of each service. Specifically, one of the descriptions of each underline in FIG. 8B is clicked.

The service is selected by, for example, an HTTP request transmitted by the above-mentioned click operation. The HTTP request includes the URL for obtaining the meta information of the service, and the Web server that has received the HTTP request searches for the service specified by the specified URL for obtaining meta information. For the specified service, the service address information is acquired from the FDQN management database (see FIG. 5), and if the selected service is RTSP, the RTSP application is started. This procedure is realized as a mechanism of a helper application possessed by a general WWW browser. The service application activation process is performed, for example, by using SI described in detail in RFC2543.
It is also possible to use P (Session Initiation Protocol).

The present invention has been described in detail with reference to the specific embodiments. However, it is obvious that those skilled in the art can modify or substitute the embodiment without departing from the spirit of the present invention. That is, the present invention has been disclosed by way of example, and should not be construed as limiting. In order to determine the gist of the present invention, the claims described at the beginning should be considered.

[0079]

As described above, according to the communication management system, communication terminal, communication management method, and program storage medium of the present invention, when a host requests an IP address, a list or attribute created in advance is used. It is possible to automatically assign a host name together with an IP address based on the IP address. Further, by registering the correspondence between the IP address set for the host and the FQDN including the host name in the FQDN management device, the IP address for the host is changed. Will be accessible with the same host name. Therefore, even in an environment where the IP address changes dynamically, communication using the host name or FQDN can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a system configuration of a communication management system according to the present invention.

FIG. 2 is a diagram for explaining an IP address and host name setting sequence in the communication management system of the present invention.

FIG. 3 is a diagram showing a configuration example of an IP address assignment database in the communication management system of the present invention.

FIG. 4 is a diagram showing a configuration example of a host name candidate list database in the communication management system of the present invention.

FIG. 5 is a diagram showing a configuration example of an FQDN management database in the communication management system of the present invention.

FIG. 6 is a sequence diagram (example 1) for explaining the processing of the host name assignment device in the communication management system of the present invention.

FIG. 7 is a sequence diagram (Example 2) for explaining the processing of the host name assignment device in the communication management system of the present invention.

FIG. 8 is a diagram showing a display example in a specific processing mode in the communication management system of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 IP address assigning device 2 host name assigning device 3 FRDN management device 4, 5 host 11 IP address assigning unit 12 host name assigning request unit 13 assignment status answering unit 14 IP address assignment database 15 FQDN registration / update requesting unit 21 host name assigning Part 22 allocation status inquiry part 23 host name candidate list database 24 FQDN name inquiry part 31 FQDN name registration / update part 32 FQDN answer part 41 IP address allocation request part 42 host name candidate list 43 host identifier 52 host identifier 53 attribute identifier

Claims (16)

[Claims] 1. An IP address assigning device for setting an IP address for a host in response to an IP address setting request from a host, a host name assigning device for setting a host name for the host, and setting of the IP address assigning device And a FQDN management device that has a database in which the IP address and the host name set by the host name assignment device are associated with each other, and executes access management by the host name. 2. The apparatus according to claim 1, wherein the host name assigning device has a database in which a plurality of host name candidates are listed, and a host name selected from the database is set in the host. Communication management system as described. 3. The host name assigning apparatus has a database listing host attributes and a plurality of host name candidates, determines the attributes of the host, and selects a host selected from the host name candidates corresponding to the attributes in the database. 2. The communication management system according to claim 1, wherein the communication management system has a configuration for setting a name to a host. 4. The communication management system according to claim 1, wherein the host name assigning device has a configuration in which a host name selected from a host name candidate list of the host is set to the host. 5. The host name assigning device according to claim 1, wherein the database in which the host name of the FQDN management device is associated with the IP address has no data entry that matches the host name candidate to be set and that has a different registered host. The communication management system according to claim 1, wherein the host name candidate is set to a host on condition of the following. 6. The host name assigning device has a database listing a plurality of host name candidates, and a host name that matches a host name selected from the host name candidate list is a host name of an FQDN management device. IP
When registered as data of a different host in the database associated with the address, a different host name candidate newly selected from the host name candidate list;
2. The communication management system according to claim 1, further comprising: selecting correction data of the host name selected from the host name candidate list as a new host name candidate and executing an inquiry to the database. 3. 7. The FQDN management device associates the IP address with the host name in the database according to the setting of a new IP address and a host name by the IP address assignment device and the host name assignment device. 2. The communication management system according to claim 1, wherein the communication management system has a configuration for executing a process of registering the entered entry in the database. 8. A communication terminal accessible via a network based on an IP address and a host name, comprising a host name candidate list set for the communication terminal, and transmitting the host name candidate list to the host name allocating device. A communication terminal having a configuration for executing a host name setting request. 9. A communication terminal that is accessible via a network by an IP address and a host name, has an attribute identifier of the communication terminal, and transmits a host name setting request to the host name allocating device by transmitting the attribute identifier. A communication terminal having a configuration for performing the following. 10. An IP address setting step of setting an IP address for the host in response to an IP address setting request from the host, a host name setting step of setting a host name for the host, and setting in the IP address setting step. A registration step of associating the registered IP address with the host name set in the host name setting step and registering it in a database. 11. The communication management method according to claim 10, wherein in the host name setting step, a host name selected from a database listing a plurality of host name candidates is set to the host. 12. The host name setting step judges a host attribute and sets a host name selected from the host name candidates corresponding to the attribute in a database in which the host attributes and a plurality of host name candidates are listed. The communication management method according to claim 10, wherein: 13. The communication management method according to claim 10, wherein in the host name setting step, a host name selected from a host name candidate list of the host is set to the host. 14. The host name setting step sets the host name candidate to a host on the condition that there is no data entry that matches the host name candidate to be set in the database and the registered host is different. The communication management method according to claim 10, wherein: 15. The host name setting step, wherein a host name matching a host name selected from a host name candidate database listing a plurality of host name candidates is
When registered as data of a different host in the FQDN database in which the host name and the IP address are associated with each other, a different host name candidate newly selected from the host name candidate list, or a host name selected from the host name candidate list 11. The communication management method according to claim 10, wherein the correction data is selected as a new host name candidate and an inquiry is made to the FQDN database. 16. A program storage medium for providing a computer program for causing a computer system to execute an IP address and host name setting process,
The computer program comprises: an IP address setting step of setting an IP address for the host in response to an IP address setting request from the host; a host name setting step of setting a host name for the host; A program storage medium, comprising: a registration step of associating a set IP address with a host name set by the host name assignment device and registering the set in a database.