JP2002319960A - Method for externally accessing to server connected to lan via internet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accessing method which is excellent in security property even under a condition for performing the Internet connection from a LAN side by PPP connection, accesses a server of the LAN side from an external client terminal via the Internet, also enables the server side to decide whether to be an incoming telephone call for a conversation purpose or to be an incoming telephone call for performing communication and is also at a low cost. SOLUTION: In this LAN including an Internet connection device having a function for connecting to an Internet service provider and the server, this method is to access the server connected to the LAN from an external terminal of a client side under the condition that connects to the Internet from the LAN side by PPP connection, and to access the server of the LAN side from the outside via the Internet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Point to Point Protocol for connecting to the Internet from a LAN side.
(PPP) This method relates to a method of communication between a server on the LAN side and an external client terminal in a communication mode of establishing a connection by (PPP). After authenticating the external client terminal, via the Internet , LA
The present invention relates to a technique for enabling communication between an N-side server and an external client terminal to be established.

[0002]

2. Description of the Related Art The present applicant filed a patent application No. 20001779.
No. 91 (hereinafter referred to as a prior application) filed an application for an access method via the Internet. However, in the prior application, there is a problem that when a call is received on the computer network server side, the terminal of the caller is not authenticated and dial-up is performed even when a call is received from a terminal of an unspecified person. there were. Also, depending on the caller, there are cases where it is desired to make a call for the purpose of a normal conversation.However, in the method of the prior application, the same telephone number is used to make a call when the caller desires a conversation. There is a problem that it is impossible to distinguish between the incoming call and the incoming call when communication with the network is desired. The present invention solves the problems in these prior applications, has excellent security, and determines whether the caller desires a telephone call or a communication toward the network when receiving the same telephone number. It provides a distinct access method.

[0003] Communication between computers via the Internet has been widely performed. In communication using the Internet, a unique identification number composed of 32 bits for specifying a computer on the Internet is assigned to IP (Internet Protocol), which is a protocol currently used on the Internet. This unique identification number is an address (global address) that maintains uniqueness worldwide, and this identification number is called an IP address. The IP address represented by this 32-bit bit string is usually divided into 8 bits, and four 1-bits such as 210.215.53.30 are used.
Expressed as a decimal number.

[0004] All computer terminals connected to the Internet are assigned this IP address in some form, and the communication partner can be specified by this number. A terminal that receives a leased line service from an Internet service provider (hereinafter referred to as an ISP) can obtain a fixed IP address from the ISP in advance, but if it connects using Point to Point Protocol (PPP) (often a dial-up connection) ) Is an address that is not currently used by another user among addresses reserved by the ISP each time a connection is made.
It is automatically allocated to the computer terminal by the server on the P side. Connecting to the ISP using Point to Point Protocol (PPP) is hereinafter referred to as PPP connection.

[0005] WWW (World Wide Web)
A computer that provides information by the mechanism described above is called a Web server. In order to browse information provided by the Web server from a terminal on the client side, the terminal needs to know the IP address of the Web server in advance. For this reason, the Web server is always connected to the Internet network, and needs to obtain a fixed IP address in advance.

[0006] When a Web server is constructed at an individual level and the Web server is accessed from the outside via the Internet, for the reasons described above,
A method has been conceived in which a Web server is automatically connected to an ISP by PPP over a telephone, or the Internet is always connected, and a fixed IP address acquired in advance is accessed from outside.

[0007]

However, as described above, as described above, the prior patent application No.
In the case where a call is received on the computer-network server side, the originating terminal is not authenticated, so that even if a call is received from an unspecified person's terminal, a PPP connection operation is performed. The specific terminal is We
When the browser can be used, there is a problem that a communication connection to the server is possible even with a terminal not desired by the server. Also, depending on the source, there is a case where a telephone call is made for the purpose of a conversation, but it is not possible to distinguish between a telephone call for the purpose of a conversation and a telephone call for triggering communication toward the network. There was a problem that.

Further, in order to obtain a fixed IP address in advance by always-on connection, a large amount of cost is required for maintaining the IP address, and it has not been possible to easily construct a Web server. Also, for the same reason, a home server is constructed to obtain home network information and access is made from the outside. It was not easy to spread widely.

In addition, the current IP (Internet Protocol)
The IP address issued based on r.4 is composed of 32 bits, and there is a problem that the number of issued IP addresses is depleted at present and it is not practical in the future.

[0010] The present invention has been made in view of the above circumstances, and is excellent in security even under conditions of making an Internet connection from the LAN side by a PPP connection. Provides a method for accessing the server on the LAN side, and allows the server side to determine whether it is a telephone call for conversation purposes or a telephone call for communication, and provides a low-cost access method. The purpose is to do.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a LAN including an Internet connection device having a function of connecting to an Internet service provider and a server. A method in which a server connected to a LAN is accessed from an external terminal on a client side under a condition of connecting to the Internet by a connection, wherein the server makes a telephone call from first log data recorded in an Internet connection device. A step of obtaining incoming information by a program provided in the server, a step of making a PPP connection from an Internet connection device to a predetermined Internet service provider in accordance with an instruction from the server, and a step of making an Internet connection from a server of the Internet service provider at the time of PPP connection. Extracting the IP address assigned to the device from the second log data recorded on the Internet-connected device by a regular expression using a program provided on the server, wherein the server sends the IP address to a predetermined client-side external terminal; And transmitting a mail to the Internet-connected device having the IP address included in the text data of the mail. A method for externally accessing a server on the LAN side via the Internet is configured.

A LAN including an Internet connection device having a function of connecting to an Internet service provider through a dial-up connection, and a server
A method of externally accessing a server connected to a LAN under the condition of connecting to the Internet by a dial-up connection from a LAN side, wherein the server determines the incoming call state of an Internet connection device by the server. Monitoring with an AT command by a program provided in the server, recording the incoming call status as first log data on the server by a program provided on the server, the server sends the first log data to the server from the first log data. A step of obtaining incoming call information by a program provided; a step of dial-up connection from an Internet connection device to a predetermined Internet service provider according to an instruction from the server; a step of dial-up connection from a server of the Internet service provider. Extracting the IP address assigned to the server on the AN side by a regular expression from an IP address setting file recorded on the server by a program provided on the server, wherein the server sends the IP address to an external terminal on a predetermined client side And transmitting a mail to the Internet-connected device having the IP address included in the text data of the mail. A method for externally accessing a server on the LAN side via the Internet is configured.

In a LAN including an Internet connection device and a server, when the Internet connection device is connected to an Internet service provider, an external terminal on the client side makes a telephone call to the LAN side and disconnects. By doing so, a trigger is issued to the Internet service provider of the Internet-connected device on the LAN side, and the server on the LAN side is externally accessed via the Internet.

In a LAN including an Internet connection device and a server, a PPP from the LAN
The connection operation is performed by a LAN-type PPP connection from an Internet connection device in accordance with an instruction from the server, and the server on the LAN side is externally accessed via the Internet.

[0015] In a LAN including an Internet connection device and a server, dial-up from the LAN is performed by the server through a terminal type dial-up connection via the Internet connection device, and the server on the LAN side is characterized in that: Is accessed from outside via the Internet.

The first log data is acquired by a program provided in the server, in which the incoming and outgoing data is pattern-matched with a regular expression, the incoming telephone number is pattern-matched with a regular expression, the incoming telephone number Comparing the data with a preset telephone number data set in advance using a regular expression. The method is characterized in that the server on the LAN side is externally accessed via the Internet. ing.

The external terminal on the client side of the mail destination is determined by the server reading out the mail transmittable client terminal data recorded in the server in advance, and the external terminal is connected to the server on the LAN side via the Internet. Access is made from.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As an embodiment of the first aspect of the present invention, a method for externally accessing a server on the LAN side under a condition that the LAN side connects to the Internet via a PPP connection will be described below.

FIG. 1 is a block diagram showing a configuration example for embodying the present invention.

When the LAN 100 side and the external terminal 104 on the client side communicate with each other via the Internet network 105, a server 101 and an Internet connection device 102 are provided on the LAN 100 side. The Internet network 105 is connected from the Internet connection device 102. Reference numeral 1010 denotes a connection device connected to the server 101 via Ethernet (registered trademark). An ISP server 103 is connected to the Internet network 105.

In the case of this embodiment, the LAN 100 is not always connected to the Internet network 105, but is connected to the Internet network 105 by a PPP connection when necessary. For this reason, the Internet connection device 102 does not always acquire the global IP address described above, and the IP address is automatically assigned by the ISP server 103 every time the connection is established.

Here, the Internet connection device 102
Uses a general device for connecting to the Internet such as a dial-up router, and is connected to both the LAN side and a public telephone line. When using a dial-up router, dial up the ISP
Connect to Also, because of using PPP connection,
To connect to the ISP, it is possible to use an Internet connection device using a normal dial-up connection,
xDSL (eg Asymmetric Digital Subscriber Line
Internet connection device using the Internet connection method or the Symmetric Digital Subscriber Line method, or an Internet connection device for connecting to the ISP by the IP connection communication method using an optical fiber as a communication means.

FIG. 2 is a flowchart showing the processing of the server 101 on the LAN 100 side.

Reference numeral 201 denotes a step in which the server 101 acquires the first log data recorded on the Internet-connected device 102 by a program provided in the server 101. The first log data is the source number, connection,
It includes data of incoming call information such as disconnection time data and charge data. In this log data, the caller's telephone number, incoming call, and disconnection time data are acquired to authenticate the caller and to receive a telephone call for conversation or request a connection to a server on the LAN side. Authentication of incoming calls is being performed. This is called first authentication.
The log data is stored in the storage unit of the Internet connection device 102. The log data is acquired by a program provided in the server 101, and the telephone number of the caller, the incoming call, and the disconnection data are obtained from the log data. If yes (if true), proceed to the next step; if not (if false), repeat the process.

Reference numeral 202 denotes a step of making a PPP connection from the Internet connection device 102 to a predetermined ISP according to an instruction from the server 101. Since the PPP connection destination data is stored in the Internet connection device 102 in advance, the PPP connection operation processing is performed when the processing at 201 is true and the processing is passed.

Reference numeral 203 denotes an IP address assigned to the Internet-connected device 102 from the server 103 of the Internet service provider at the time of PPP connection from a second log data recorded in the Internet-connected device 102 by a program provided in the server 101. It is a step to do. As described above, in the connection for connecting to the Internet by the PPP connection, the IP address is assigned by the ISP server each time the connection is made. The information of the assigned IP address is stored as second log data in the storage unit of the Internet connection device 102. The server 101 uses a program provided in the server 101 to convert the second log data into a regular expression. Perform extraction processing. If the acquired second log data includes IP address data (if true), the process proceeds to the next step; otherwise (if false), the PPP connection step 202 Return to

Reference numeral 204 denotes a step in which the server 101 transmits the mail to the predetermined client terminal 104 as a URL including the obtained IP address in the body data. The IS provided by the program provided in the server 101
Processing is performed so that the IP address allocated from the P server 103 is included in the mail body data in the URL format. FIG. 3 shows an automatically created mail body. The server 101 transmits the mail text to the client-side external terminal 104 defined in the mail transmission destination list data in advance. The external terminal 104 on the client side that has received the mail issues a connection request to the URL described in the mail text. Since the URL is linked, the operation of the client-side external terminal 104 can be automatically performed by a click operation.

Next, an embodiment of the present invention will be described.

FIG. 4 is a block diagram showing a configuration example for realizing the present invention.

When the LAN 400 and the external terminal 404 on the client side communicate with each other via the Internet network 405, a server 401 and an Internet connection device 402 are provided on the LAN 400 side. The connection to the Internet network 405 is made from the Internet connection device 402. Reference numeral 4010 denotes a connection device connected to the server 401 via Ethernet (registered trademark). An ISP server 403 is connected to the Internet network 405. Although the configuration is the same as that of the block diagram of FIG. 1 described above, a TA is used as the Internet connection device 402 in the present embodiment. Since the TA has no data storage unit, the aforementioned log data is stored in the server 40.
1 is different.

FIG. 5 is a flowchart showing the processing of the server 401 on the LAN 400 side. 501 is the server 4
01 is a step of transmitting an AT command to the Internet connection device 402. By sending an AT command from the server 401 to the Internet connection device 402 by a program provided in the server 401,
The incoming call status of the TA is directly monitored by the server 401. The data indicating the incoming call status includes connection status data such as caller number data, connection and disconnection time data, and the like.

Reference numeral 502 denotes a step of recording the incoming call state as first log data by a program provided in the server 401. The data to be recorded includes the number data of the caller, information on the connection and disconnection time.

Step 503 is a step of acquiring telephone call information from the first log data. Server 401
The incoming call information is stored in the server 40 from the first log data.
It is acquired by the program provided in 1. By monitoring these data, authentication relating to the source is performed, and this is called first authentication. If the source telephone number and incoming data are obtained from the first log data (if true), proceed to the next step; if not (if false), repeat processing. I do.

Reference numeral 504 denotes a step of performing dial-up connection from the Internet connection device 402 to a predetermined ISP according to an instruction from the server 401. Since the dial-up destination data is stored in the server 401 in advance, the dial-up process is performed when the process at 503 is true and the process is passed.

Reference numeral 505 denotes an IP address assigned to the server 401 from the Internet service provider's server 403 at the time of dial-up connection by using a regular expression by a program provided in the server 401 from an IP address setting file recorded in the server 401. Step.

Here, the Internet connection device 402 is for branching the line, and the IP address at the time of connection is assigned to the server 401 from the server 403 of the ISP. As described above, in a connection that connects to the Internet through a dial-up connection, an IP address is assigned by the ISP server each time the connection is made. The information of the assigned IP address is stored in the server 4
01 is stored as an IP setting file, and the server 401 performs a process of extracting a regular expression from the IP setting file by a program provided in the server 401. If the acquired IP address setting data includes IP address data (if true), the process proceeds to the next step. If not (if false), dial-up connection step 504 is performed. Return to

Step 506 is a step in which the server 401 transmits the mail to the predetermined client terminal 404 as a URL by including the acquired IP address in the body data. The IS provided by a program provided in the server 401
Processing is performed so that the IP address allocated from the P server 403 is included in the mail body data in the URL format. FIG. 3 shows the mail text automatically created. The server 401 transmits the mail text to the client-side external terminal 404 defined in the mail transmission destination list data in advance.

The external terminal 404 on the client side that has received the mail makes a connection request to the URL described in the mail body. Since the URL is linked, the operation of the external terminal 404 on the client side can be automatically performed by a click operation.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the ISP is provided from the LAN 100 or 400 side.
It shows a control method in the case of connecting to. External client terminals 104 and 404 are connected to LANs 100 and 4
The server 101 and the server 401 on the LAN 100 and 400 side make a telephone call event by making a call to the 00 side and performing a disconnection operation when a ringing tone is emitted.
The disconnection event and the telephone number data of the caller are acquired from the servers 101 and 401 by a program provided in the servers 101 and 401, and are used as a trigger for the connection operation to the ISP. With this, whether the call from the external terminal on the client side is intended for conversation,
It is possible to distinguish and recognize the difference of whether it is for the purpose of accessing the server on the side. That is, if a disconnection occurs a few seconds after the incoming call, it is determined that the connection to the server on the LAN side is intended, and if the incoming call is continued, it is determined that the incoming call is for a conversation. Is what you do.

According to a fourth aspect of the present invention, in the first aspect of the present invention, when a PPP connection is made from the LAN 100 side, an Internet connection device 1 is issued in response to an instruction from the server 101.
02 is a method for making a LAN type PPP connection.
In this case, the IP address assigned by the ISP is assigned to the Internet connection device 102.

In FIG. 1 described above, on the LAN 100 side, a local IP address in the LAN 100 is set in advance for the server 101, the Internet connection device 102, and each connection device 1010. Here the server 101
Is assumed to have a local IP 192.168.254.100 set in advance. Internet connection device 102 is LAN type P
After performing PP, the ISP server 103 gives the Internet connection device 102 a global IP address, for example, 125.12.
When 6.127.128 is automatically assigned, access from the external client terminal 104 is performed as follows.

First, the external client terminal 104
A connection request is made to the Internet connection device 102 (the IP address is 125.126.127.128) that has acquired a global IP address via the Internet.

Next, the Internet connection device 102 that has received the connection request performs IP address conversion. This IP address conversion is generally performed by NAT (Network Address Tran
slation) and IP masquerade (IP Masquarade). Conversion is performed by associating a global IP address with a local IP address.

Next, the Internet connection device 102 issues a connection request to the server 101 (192.168.254.100).

Server 101 (192.168.254.100)
Returns a response to the Internet connection device 102.

The Internet connection device 102 performs IP address conversion. In this case, the local IP address is converted to a global IP address.

A response is sent from the Internet connection device 102 (IP address is 125.126.127.128) to the external client terminal 104.

As described above, the PPP connection from the LAN side is transmitted from the Internet connection device to the L by the instruction from the server.
ISP because it is done by AN type PPP connection
When a LAN is configured including an Internet connection device having a function of connecting to the Internet, PPP connection is enabled, and external access is enabled.

According to a fifth aspect of the present invention, in the second aspect of the present invention, when dial-up is performed from the LAN 400 side shown in FIG. Is the way.

The server 401 is made to function in advance with an IP address conversion function, a NAT function, and an IP masquerade function by a program. When the terminal type dial-up connection is performed, the IP address allocated from the ISP is allocated to the server 401. In FIG. 4 described above, on the LAN 400 side, a local IP address is previously set in the LAN
010 is set. Here, it is assumed that a local IP 192.168.254.200 is set in the server 401 in advance. Server 401 performs terminal-type dial-up and performs IS
P server 403 has a global I
Assuming that a P address, for example, 125.126.127.129 is automatically assigned, access from the external client terminal 404 is performed as follows.

First, the external client terminal 404
Server 401 that has acquired a global IP address
(IP address is 125.126.127.129) via the Internet.

Next, the server 401 receiving the connection request
Performs IP address conversion in the server. Conversion is performed by associating a global IP address with a local IP address.

Next, the server 401 (192.168.254.20)
0) returns I to return a response to the Internet.
P address conversion is performed. In this case, conversion is performed from a local IP address to a global IP address.

Server 401 (IP address 125.12
6.127.129) responds to the external client terminal 404 through the Internet connection device 402.

As described above, the dial-up from the LAN is performed by the terminal type dial-up connection through the Internet connection device by the server.
Dial-up when a LAN is configured including a modem and a modem, and access from outside is enabled.

The invention of claim 6 is the first and second aspects of the present invention.
This is an invention of a method for analyzing the log data in acquiring the first log data shown in the invention of the first aspect.

FIG. 6 shows a flowchart of the first log data analysis. Reference numeral 601 denotes a step of pattern-matching “incoming” text data by a regular expression using a program provided in the server 101 or 401 when data is acquired. This allows the LAN 100, 400
You can know that there is an incoming call to the side. However, data using only incoming text data cannot distinguish between a telephone call for the purpose of conversation and a telephone call for communication with a server on the LAN side.
In the next step 602, the distinction is made. In step 602, a step of pattern-matching “cut” text data is provided. A timer is provided by a program in the transition from step 601 to step 602, and a time difference is provided for several seconds.

The distinction between the telephone for the purpose of conversation and the telephone for accessing the server on the LAN side is made between these steps. When making an access, an external terminal on the client side makes a telephone call, and requires an operation to temporarily disconnect the telephone when a ringing tone is emitted.
In step 602, if the disconnection data is included in the first log data (if true), the process returns to the next step; otherwise (if false), the process returns to the beginning.

Step 603 is a step of analyzing the incoming telephone number. The pattern of “call number data” is matched with a regular expression by a program provided in the servers 101 and 401.

For the regular expression, telephone number data set in the program in advance is used. Server 101, 401
Outputs true only when it matches the telephone number data registered in. Otherwise, output false and return to the beginning. This makes it possible to determine whether the incoming call is from an unspecified person or a terminal registered in advance, and performs the PPP connection processing or the dial-up connection processing only in the case of an incoming call from a telephone number registered and permitted in advance. It is possible. A plurality of telephone number data can be registered in the servers 101 and 401, and a plurality of client-side external terminals that can be connected to the LAN-side server can be set.

The invention of claim 7 is an invention for improving security at the time of sending a mail. FIG. 7 is a block diagram showing an embodiment of the present invention.

The server 101 is provided with a mail transmission section setting data file 701 and a mail transmission processing section 702. When the server 101 performs the mail transmission processing, the server 101 refers to the mail transmission section setting data file 701, A step of transmitting a mail to the mail address indicated in the data is provided. In order to perform mail transmission processing based on a predetermined mail transmission destination, the IP address obtained from the ISP server 103 by dial-up is transmitted only to a desired external terminal without notifying the external terminal of the unspecified external address. Publishing is possible.

The present invention is not limited to the above embodiment, but can be embodied in other specific forms without departing from the basic features. The above embodiments are mainly for illustrative purposes only, and have no restrictive meaning at all. Therefore, the scope of the present invention is determined by the description of the claims, and all the embodiments equivalent to and equivalent to the invention described in the claims are encompassed in the scope of the present invention. Shall be.

[0065]

As described above, according to the present invention, the following effects can be obtained. By acquiring and analyzing the first log data, the terminal of the caller is authenticated. When an incoming call is received from a terminal of an unspecified person, a PPP connection or a dial-up connection is performed. Instead, it is possible to make a PPP connection or dial-up only when receiving an incoming call from a telephone number registered in advance.

In addition, incoming calls and LANs for conversation purposes
This has the effect that it is possible to distinguish the incoming call from the incoming call for accessing the server on the side. In addition, the connection to the Internet network is not always used, but is connected by dial-up every time. Therefore, it is not necessary to acquire and maintain a fixed IP address. There is an effect that access can be made. In addition, there is an effect that an IP address exhaustion problem can be avoided.

The IP obtained from the ISP server
By setting an external terminal to which an address should be sent by e-mail as an electronic file in a server on the LAN side in advance, a highly secure access method can be achieved without an unknown external terminal knowing the IP address. There is an effect that it can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention;

FIG. 2 is a flowchart showing processing of a server on the LAN side;

FIG. 3 is a screen display example on an external client terminal.

FIG. 4 is a block diagram showing a second embodiment of the present invention;

FIG. 5 is a flowchart illustrating processing of a server according to the second embodiment;

FIG. 6 is a flowchart of a first log data analysis.

FIG. 7 is a block diagram for explaining security when sending an e-mail;

[Explanation of symbols]

Reference Signs List 100 LAN configuration 101 Server 102 Internet connection device 103 Internet service provider server 104 Client side external terminal 1010 Connection device 400 LAN side configuration 401 Server 402 Internet connection device 403 Internet service provider server 404 Client side external terminal 4010 Each connected device

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hideki Miyamoto 3-1-42 Oshu, Minami-ku, Hiroshima City Templar Industrial Co., Ltd. F-term (reference) 5K030 GA15 GA16 HA08 HC01 HC09 HD06 JL01 JL07 JT01 JT03 JT09

Claims (7)

[Claims] 1. A LAN configured to include an Internet connection device having a function of connecting to an Internet service provider and a server.
A method in which a server connected to a LAN is accessed from an external terminal on a client side under a condition of connecting to the Internet through a Point-to-Point Protocol (PPP) connection. A step of obtaining incoming call information from one log data by a program provided in the server, and from an Internet connection device to a predetermined Internet service provider in accordance with a point-to-point P in accordance with an instruction from the server.
rotocol (PPP) connection step, Point to Point Protoc
a step of extracting an IP address assigned to the Internet connection device from the server of the Internet service provider at the time of ol (PPP) connection from the second log data recorded in the Internet connection device by a regular expression by a program provided in the server. Sending a mail from the server to a predetermined client-side external terminal by including the IP address in the body data, and connecting the client-side external terminal to an Internet connection device having the IP address included in the body text data of the mail Making a request.
A method of accessing the AN server from outside via the Internet. 2. A LAN configured to include an Internet connection device having a function of connecting to an Internet service provider by a dial-up connection, and a server.
A method of externally accessing a server connected to a LAN under the condition of connecting to the Internet by a dial-up connection from the LAN side, wherein the server determines the incoming call state of the Internet connection device by the server. Monitoring with an AT command by a program provided in the server, recording the incoming call state in the server as first log data by a program provided in the server, the server sends the first log data to the server from the first log data. A step of obtaining incoming call information by a program provided; a step of dial-up connection from an Internet-connected device to a predetermined Internet service provider in accordance with an instruction from the server; Extracting, by a regular expression, an IP address assigned to the server on the AN side from an IP address setting file recorded on the server by a program provided on the server, wherein the server sends the IP address to a predetermined external terminal on the client side; And transmitting a mail to the Internet-connected device having the IP address included in the text data of the mail. To access the server on the LAN side from outside via the Internet. 3. In a LAN including an Internet connection device and a server, when the Internet connection device is connected to an Internet service provider, an external terminal on the client side makes a telephone call to the LAN side, 3. Accessing the LAN-side server from the outside via the Internet according to claim 1 or 2, wherein the disconnection is used as a trigger for connection of the LAN-side Internet connection device to an Internet service provider. Method. 4. In a LAN including an Internet connection device and a server, a Poin from the LAN side
t to Point Protocol (PPP) connection operation is performed from the Internet connection device according to the instruction of the server from the LAN type Point to Poi.
2. The method for externally accessing a server on the LAN side via the Internet according to claim 1, wherein the method is performed by an Internet Protocol (PPP) connection. 5. In a LAN including an Internet connection device and a server, dial-up from the LAN side is performed by the server by terminal type dial-up connection via the Internet connection device. 3. A method for externally accessing the server on the LAN side according to claim 2 via the Internet. 6. A method according to claim 1, wherein the first log data is obtained by a step of pattern-matching incoming / disconnected data with a regular expression by a program provided in a server, and the incoming telephone number is made regular. 4. The method according to claim 3, further comprising the steps of: performing a pattern matching by expression; and comparing the incoming telephone number data with preset telephone number data set in advance by a regular expression.
A method of accessing the server on the LAN side from the outside via the Internet. 7. The server according to claim 1, wherein the external terminal on the client side of the mail transmission destination is determined by the server reading out mail transmission enabled client terminal data recorded in the server in advance. LA
A method to access the N-side server from the outside via the Internet.