JP4607369B2 - A method for accessing a server connected to a LAN from the outside via the Internet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication method between a server on a LAN side and an external client terminal in a communication mode in which connection is established by Point to Point Protocol (PPP) when connecting to the Internet from the LAN side. The present invention relates to a technique for establishing communication between a server on a LAN side and an external client terminal via the Internet after authenticating an external client terminal.
[0002]
[Prior art]
The present applicant has applied for an access method via the Internet in Japanese Patent Application No. 177991 (hereinafter referred to as a prior application). However, in the prior application, when there is an incoming call on the computer network server side, the originating terminal is not authenticated, and there is a problem that dial-up is performed even when an incoming call is received from an unspecified person's terminal. there were. In addition, depending on the caller, there is a case where it is desired to make a call for the purpose of normal conversation. However, in the method of the prior application, a call when the caller wants to talk using the same phone number. There is a problem that it is impossible to distinguish between incoming calls and incoming calls when communication with the network is desired.
The present invention solves the problems in these prior applications, is excellent in security, and whether the caller wants to make a call when receiving an incoming call to the same telephone number, or whether communication to the network is desired. It provides a distinct access method.
[0003]
Communication between computers via the Internet has become widespread.
In communication using the Internet, a unique identification number composed of 32 bits for specifying a computer on the Internet is assigned in IP (Internet Protocol) which is a protocol currently used on the Internet.
This unique identification number is a globally unique address (global address), and this identification number is called an IP address. The IP address indicated by the 32-bit bit string is usually divided into 8 bits and expressed by four decimal numbers such as 210.215.53.30.
[0004]
All computer terminals connected to the Internet are assigned this IP address in some form, and a 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 ISP) can obtain a fixed IP address from the ISP in advance, but when connecting using Point to Point Protocol (PPP) (mostly dial-up connection) ), Every time a connection is made, among the addresses reserved by the ISP, addresses that are not currently used by other users are automatically assigned to computer terminals by the server on the ISP side. Connecting to an ISP using Point to Point Protocol (PPP) is hereinafter referred to as PPP connection.
[0005]
A computer that provides information using the WWW (World Wide Web) mechanism is called a Web server. To view information provided by a Web server from a client-side terminal, the terminal knows the IP address of the Web server in advance. It is necessary to keep. For this reason, the Web server is always connected to the Internet network, and it is necessary 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, a PPP connection to the ISP is automatically made to the web server by telephone for the reasons described above. There has been considered a method of always connecting to the Internet and accessing a fixed IP address acquired in advance from the outside.
[0007]
[Problems to be solved by the invention]
However, as described above, in the earlier patent application No. 177991 of the previous application, when there is an incoming call on the computer-network server side, since the terminal of the transmission source is not authenticated, it is not specified. Even if an incoming call is received from the user's terminal, PPP connection operation is performed. If the unspecified person's terminal can use a Web browser, the server can connect to the server even if the server does not want it There was a problem of being. Also, depending on the call originator, there is a case where a telephone call is made for the purpose of conversation, but it is not possible to distinguish between a telephone call for the purpose of conversation and a telephone call for triggering communication toward the network. There was a problem.
[0008]
In addition, in order to obtain a fixed IP address in advance by always-on connection, it takes a lot of money to maintain the IP address, and a Web server cannot be easily constructed. For the same reason, when a home server is constructed to acquire network information in the home and access is performed from the outside, a method using a constant connection is generally costly and increases the burden on the user. It was not easy to spread widely.
[0009]
In addition, the IP address issued based on the current IP (Internet Protocol) ver.4 is composed of 32 bits, and since the actual number of IP addresses issued is currently depleted, it is practical in the future. There is a problem that is not appropriate.
[0010]
The present invention has been made in consideration of the above circumstances. Even under the condition of connecting to the Internet by PPP connection from the LAN side, the present invention is excellent in security, and from the external client terminal to the LAN side via the Internet. To provide a method for accessing the server, and to enable the server to determine whether the incoming call is for conversational purposes or the incoming call for communication, and to provide a low-cost access method. Objective.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in a LAN including an Internet connection device having a dial-up function and a routing function, and a server, a condition for connecting to the Internet by dial-up connection from the LAN side A method for accessing a server connected to a LAN from an external terminal on the client side, When the Internet connection device is connected to the Internet service provider, the server makes a call from an external terminal on the client side to the LAN side, and after a ringing tone is emitted several seconds after the call is received If it is disconnected within a predetermined time, the step of determining as a trigger for connection to the Internet service provider of the Internet side connection device on the LAN side, The server obtains the incoming call information from the first log data recorded in the Internet-connected device by a program provided in the server, and dials-up connection from the Internet-connected device to a predetermined Internet service provider according to an instruction from the server. A step of extracting an IP address assigned to an Internet connection device from a server of an Internet service provider at the time of dial-up connection from a second log data recorded in the Internet connection device by a program provided in the server; The server sends a mail including the IP address in the body data to a predetermined external terminal on the client side, and the external terminal on the client side sends the IP address included in the body data of the mail. Performing a connection request to the Internet connection device having a scan, it constitutes a method for accessing from outside via the Internet to the LAN side of the server as a characteristic that it contains and.
[0012]
In a LAN that includes an Internet connection device having a dial-up function and a server, the server connected to the LAN is accessed from the outside under the condition of connecting to the Internet by dial-up connection from the LAN side. A way to do, When the Internet connection device is connected to the Internet service provider, the server may call the Internet if the call from the external terminal on the client side is disconnected within a predetermined time after the ringing tone is generated. Determining a trigger to connect to the service provider, A step in which the server monitors an incoming call state of the Internet connection device by an AT command by a program provided in the server, and a step of recording the incoming call state in the server as first log data by a program provided in the server; The server obtains the incoming call information from the first log data by a program provided in the server, the dial-up connection from the internet connection device to the predetermined internet service provider according to the instruction from the server, the dial-up The IP address assigned to the server on the LAN side from the Internet service provider server at the time of connection is expressed in regular expressions from the IP address setting file recorded on the server by the program installed on the server. A step in which the server sends a mail including the IP address included in the body data to a predetermined external terminal on the client side, and the external terminal on the client side connects to an Internet connection device having an IP address included in the body data of the mail And a step of making a connection request to the server, and a method for accessing the server on the LAN side from the outside via the Internet.
[0016]
The first log data acquisition is performed by a program provided in the server, in which a step of matching the incoming and outgoing data with a regular expression, a step of matching a incoming telephone number with a regular expression, A step of comparing the set telephone number data that has been set with a regular expression is executed, and the server on the LAN side is accessed from the outside via the Internet.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0019]
As an embodiment of the invention of claim 1, a method for accessing a server on the LAN side from the outside under the condition of connecting to the Internet by PPP connection from the LAN side will be described below.
[0020]
FIG. 1 is a block diagram showing a configuration example for embodying the present invention.
[0021]
When the LAN 100 side and the client-side external terminal 104 communicate via the Internet network 105, a server 101 and an Internet connection device 102 are provided on the LAN 100 side. A connection is made from the Internet connection device 102 to the Internet network 105. Reference numeral 1010 denotes a connection device connected to the server 101 by Ethernet (registered trademark).
An ISP server 103 is connected to the Internet network 105.
[0022]
In the present embodiment, the LAN 100 side is not always connected to the Internet network 105, and is connected to the Internet network 105 by PPP connection when necessary. For this reason, the Internet connection device 102 does not always acquire the global IP address described above, and an IP address is automatically allocated by the server 103 of the ISP every time it is connected.
[0023]
Here, the Internet connection device 102 is a general device that connects to the Internet, such as a dial-up router, and is connected to both the LAN side and the public telephone line. When using a dial-up router, the ISP is connected by dial-up connection.
In addition, since the PPP connection is used, it is possible to use an Internet connection device using a normal dial-up connection for connection to the ISP, such as xDSL (for example, Asymmetric Digital Subscriber Line method or Symmetric Digital Subscriber Line). Internet connection equipment using the (method) method, and Internet connection equipment for connecting to the ISP by the IP connection communication method using optical fibers as communication means can be used.
[0024]
FIG. 2 is a flowchart showing processing of the server 101 on the LAN 100 side.
[0025]
201 is a step in which the server 101 acquires the first log data recorded in the Internet connection device 102 by a program provided in the server 101. The first log data includes data of incoming call information such as a caller number, connection / disconnection time data, and charge data. In this log data, the caller's phone number, incoming call, and disconnection time data are acquired to authenticate the caller, and for the purpose of incoming call for the purpose of conversation or connection request to the server on the LAN side. Authenticates whether there is an incoming call. 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, incoming call, and disconnection data are obtained from the log data. If it is true (if it is true), proceed to the next step, and if it is not obtained (if it is false), repeat the process.
[0026]
202 is a step of making a PPP connection from the Internet connection device 102 to a predetermined ISP in accordance with an instruction from the server 101. Since the PPP connection destination data is stored in the Internet connection device 102 in advance, when the process 201 is true, the PPP connection operation process is performed.
[0027]
203 is a step of acquiring an IP address assigned to the Internet connection device 102 from the Internet service provider server 103 by the program provided in the server 101 from the second log data recorded in the Internet connection device 102 during PPP connection. is there. As described above, in connection with connection to the Internet by PPP connection, an IP address is allocated by the ISP server each time the connection is made. The information of the allocated IP address is stored as second log data in the storage unit of the Internet connection device 102, but the server 101 uses a program provided in the server 101 to convert the second log data into a regular expression. Perform the extraction process. If the acquired second log data includes IP address data (if true), the process proceeds to the next step. If not (if false), the PPP connection step 202 is performed. Return to.
[0028]
204 is a step in which the server 101 includes the acquired IP address in the body data and sends it as a URL to the predetermined client terminal 104 side. Processing is performed so that the IP address allocated from the ISP server 103 is included in the mail body data in the URL format by a program provided in the server 101. FIG. 3 shows a mail text automatically created. The server 101 transmits the mail text to the external terminal 104 on the client side that is determined in advance in the mail transmission destination list data. The client-side external terminal 104 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 external terminal 104 on the client side can be automatically connected by a click operation.
[0029]
Next, an embodiment of the invention of claim 2 will be described.
[0030]
FIG. 4 is a block diagram showing a configuration example for embodying the present invention.
[0031]
When the LAN 400 side and the client-side external terminal 404 communicate via the Internet network 405, a server 401 and an Internet connection device 402 are provided on the LAN 400 side. Connection is made from the Internet connection device 402 to the Internet network 405. Reference numeral 4010 denotes a connection device connected to the server 401 by Ethernet (registered trademark). An ISP server 403 is connected to the Internet network 405. Although the configuration is the same as the block diagram of FIG. 1 shown above, TA is used as the Internet connection device 402 in this embodiment. Since the TA has no data storage unit, the log data described above is stored in the server 401.
[0032]
FIG. 5 is a flowchart showing processing of the server 401 on the LAN 400 side.
Reference numeral 501 denotes a step in which the server 401 sends 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 state of the TA is directly monitored by the server 401. The data indicating the incoming call state includes connection state data such as source number data, connection, and disconnection time data.
[0033]
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 source number data, connection and disconnection time information.
[0034]
Reference numeral 503 denotes a step of acquiring incoming call information from the first log data. The server 401 acquires the incoming call information from the first log data by a program provided in the server 401. By monitoring these data, authentication related to the sender is performed, and this is called first authentication. If the caller's phone number and incoming data are obtained from the first log data, the process proceeds to the next step (if true), and if not, the process is repeated (if false). I do.
[0035]
Reference numeral 504 denotes a step of dial-up connection from the Internet connection device 402 to a predetermined ISP in accordance with an instruction from the server 401. Since dial-up destination data is stored in the server 401 in advance, the dial-up process is performed when the process 503 is true.
[0036]
Reference numeral 505 denotes a step of extracting the IP address assigned to the server 401 from the server 403 of the Internet service provider during dial-up connection from the IP address setting file recorded in the server 401 by a regular expression by a program provided in the server 401. .
[0037]
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 connection to connect to the Internet by dial-up connection, an IP address is allocated by the ISP server each time the connection is made. Information on the allocated IP address is stored in the server 401 as an IP setting file. The server 401 performs a process of extracting the IP setting file from the IP setting file with a regular expression by a program provided in the server 401. If the acquired IP address setting data includes IP address data (if it is true), the process proceeds to the next step. If not (if it is false), the dial-up connection step 504 is performed. Return to.
[0038]
Reference numeral 506 denotes a step in which the server 401 includes the acquired IP address in the body data and sends it as a URL to the predetermined client terminal 404 side. The program provided in the server 401 performs processing so that the IP address allocated from the ISP server 403 is included in the mail body data in the URL format. FIG. 3 shows an automatically created mail text. The server 401 transmits the mail text to the client-side external terminal 404 that is predetermined in the mail transmission destination list data.
[0039]
The client-side external terminal 404 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 external terminal 404 on the client side can be automatically connected by a click operation.
[0040]
next, In the invention of claim 1 or claim 2, a control method in the case of connecting to the ISP from the LAN 100, 400 side is shown. When the external client terminals 104 and 404 make a telephone call to the LAN 100 and 400 side and perform a disconnection operation when a ringing tone is generated, the server 101 and the server 401 on the LAN 100 and 400 side receive an incoming call event, a disconnection event, and The telephone number data of the caller is acquired from the servers 101 and 401 by a program provided in the servers 101 and 401, and used as a trigger for the connection operation to the ISP. As a result, it is possible to distinguish and recognize whether the outgoing call from the external terminal on the client side is for the purpose of conversation or for the purpose of accessing the server on the LAN side. In other words, if a call is disconnected several seconds after the incoming call, it is determined that the connection is made to the server on the LAN side, and if the incoming call continues, it is determined that the incoming call is intended for conversation. To do.
[0041]
next In the invention of claim 1, when PPP connection is made from the LAN 100 side, a method for making a LAN type PPP connection from the Internet connection device 102 in accordance with an instruction from the server 101 Indicate . In this case, the IP address allocated from the ISP is allocated to the Internet connection device 102.
[0042]
In FIG. 1 described above, on the LAN 100 side, local IP addresses in the LAN 100 are set in advance in the server 101, the Internet connection device 102, and each connection device 1010. Here, it is assumed that the local IP 192.168.254.100 is preset in the server 101. When the Internet connection device 102 performs LAN type PPP and the ISP server 103 automatically assigns a global IP address, for example, 125.126.127.128, to the Internet connection device 102, the access from the external client terminal 104 is as follows. To be done.
[0043]
(1) First, the external client terminal 104 makes a connection request via the Internet to the Internet connection device 102 (IP address is 125.126.127.128) that has acquired a global IP address.
[0044]
(2) Next, the Internet connection device 102 that has received the connection request performs IP address conversion. This IP address translation uses a technique generally called NAT (Network Address Translation) or IP Masquarade. A translation is performed by associating a global IP address with a local IP address.
[0045]
(3) Next, the internet connection device 102 makes a connection request to the server 101 (192.168.254.100).
[0046]
(4) The server 101 (192.168.254.100) returns a response to the Internet connection device 102.
[0047]
(5) The internet connection device 102 performs IP address conversion. In this case, the local IP address is converted into a global IP address.
[0048]
(6) A response is made from the Internet connection device 102 (IP address is 125.126.127.128) toward the external client terminal 104.
[0049]
As described above, since the PPP connection from the LAN side is performed by the LAN type PPP connection from the Internet connection device according to the instruction from the server, the LAN is configured including the Internet connection device having a function of connecting to the ISP. In this case, PPP connection is possible and access from the outside is possible.
[0050]
next In the second aspect of the invention, when dialing up from the LAN 400 side shown in FIG. 4, a terminal type dialup connection is made through the Internet connection device 402 in accordance with an instruction from the server 401. Indicate .
[0051]
In the server 401, an IP address conversion function, NAT, and IP masquerade function are made to function in advance 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 set in advance in the server 400 and each connected device 4010 in the LAN 400. Here, it is assumed that the local IP 192.168.254.200 is preset in the server 401. When the server 401 performs terminal type dial-up and the ISP server 403 automatically assigns a global IP address, for example, 125.126.127.129, to the server 401, access from the external client terminal 404 is performed as follows. Is called.
[0052]
(1) First, the external client terminal 404 makes a connection request via the Internet to the server 401 (IP address is 125.126.127.129) that has acquired a global IP address.
[0053]
(2) Next, the server 401 receiving the connection request performs IP address conversion in the server. A translation is performed by associating a global IP address with a local IP address.
[0054]
(3) Next, the server 401 (192.168.254.200) performs IP address conversion again in order to return a response toward the Internet. In this case, conversion is performed from a local IP address to a global IP address.
[0055]
(4) The server 401 (IP address is 125.126.127.129) responds to the external client terminal 404 through the Internet connection device 402.
[0056]
As described above, dial-up from the LAN is performed by terminal type dial-up connection through the Internet connection device by the server, so that dial-up can be performed when the LAN is configured including the TA and the modem. It was possible to access from.
[0057]
next The invention of the method for analyzing the log data in the acquisition of the first log data shown in the inventions of claim 1 and claim 2.
[0058]
FIG. 6 shows a flowchart of the first log data analysis. In step 601, when data is acquired, the text data of “incoming” is pattern-matched with a regular expression by a program provided in the servers 101 and 401. As a result, it is possible to grasp that there is an incoming call from the outside toward the LAN 100, 400 side. However, since only incoming text data cannot distinguish between incoming calls for the purpose of conversation and incoming calls for communication to a server on the LAN side, the distinction is made in the next step 602. ing. In step 602, a step of pattern matching “cut” text data is provided. In the transition from the previous step 601 to step 602, a timer is provided by a program, and a time difference is provided for several seconds.
[0059]
A distinction is made between the phone for the purpose of conversation and the phone for accessing the server on the LAN side between these steps. In the case of access, an external terminal on the client side makes a call and requires an operation to temporarily disconnect the call when a ringing tone is generated. If disconnection data is included in the first log data in step 602 (if true), the process returns to the next step, and if not included (if false), the process returns to the beginning.
[0060]
Step 603 is a step of analyzing the incoming telephone number. The program provided in the servers 101 and 401 performs pattern matching on “incoming number data” with a regular expression.
[0061]
As the regular expression, telephone number data set in advance in the program is used. True is output only when it matches the telephone number data registered in the servers 101 and 401. Otherwise, output false and return to the beginning. As a result, it is possible to determine whether the incoming call is from an unspecified person or a pre-registered terminal, and the PPP connection process or the dial-up connection process is performed only when the incoming call is from a telephone number registered and permitted in advance. It is possible. Note that 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.
[0062]
next , To increase security when sending email Example . FIG. 7 shows a block diagram constituting the invention of claim 7.
[0063]
In the server 101, a mail transmission unit setting data file 701 and a mail transmission processing unit 702 are provided. When the server 101 performs mail transmission processing, the mail transmission unit setting data file 701 is referred to, and the data is stored in the data. There is a step of sending an e-mail to the indicated e-mail address. In order to perform mail transmission processing based on a predetermined mail transmission destination, only the desired external terminal is notified without informing the unspecified external terminal of the IP address acquired from the ISP server 103 by dial-up. Open to the public.
[0064]
The present invention is not limited to the above-described embodiments, and can be implemented in other specific forms without departing from the basic characteristics thereof. The above embodiments are mainly for illustrative purposes only and do not have any limiting meaning.
Therefore, the scope of the present invention is determined by the description of the scope of claims, and all embodiments that fall within the meaning and range equivalent to the scope of the present invention are included in the scope of the present invention. Shall.
[0065]
【The invention's effect】
As described above in detail, according to the present invention, the following effects can be obtained.
Since the first log data is obtained and analyzed, the originator's terminal is authenticated, so when an incoming call is received from an unspecified person's terminal, PPP connection or dial-up connection is performed. As a result, PPP connection or dial-up can be performed only when a call is received from a telephone number registered in advance.
[0066]
In addition, there is an effect that it is possible to distinguish between incoming calls for the purpose of conversation and incoming calls for accessing the server on the LAN side.
In addition, since the connection to the Internet network does not always use the connection, and the connection is made by dial-up each time, there is no cost for acquiring and maintaining the fixed IP address, and the LAN side server is externally controlled with low cost. There is an effect that access can be performed. In addition, the IP address exhaustion problem can be avoided.
[0067]
In addition, by setting an external terminal to which an IP address acquired from the ISP server should be sent as an electronic file in the LAN side server in advance, the IP address is not known to unspecified external terminals. There is an effect that it is possible to provide a highly secure access method.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first embodiment configuration example of the present invention.
FIG. 2 is a flowchart showing processing of a server on the LAN side.
[Fig. 3] Example of screen display on an external client terminal
FIG. 4 is a block diagram showing a second exemplary configuration of the present invention.
FIG. 5 is a flowchart showing processing of the server of the second embodiment.
FIG. 6 is a flowchart of first log data analysis.
FIG. 7 is a block diagram for explaining security at the time of mail transmission.
[Explanation of symbols]
100 LAN configuration
101 server
102 Internet connection equipment
103 Internet service provider server
104 External terminal on the client side
1010 Each connected device
400 LAN configuration
401 server
402 Internet connection equipment
403 Internet service provider server
404 External terminal on the client side
4010 Each connected device

Claims (3)

In a LAN that includes an Internet connection device that has a function of connecting to an Internet service provider and a server, under the condition of connecting to the Internet from the LAN side with Point to Point Protocol (PPP) connection,
A method for accessing a server connected to a LAN from an external terminal on the client side,
When connecting the Internet connection device to the Internet service provider,
The server, step telephone call from the client side of the external terminal, after the ringing tone is emitted, when cleaved within a predetermined time period, it is determined that the trigger of the connection to the Internet service provider,
The server obtains the incoming call information from the first log data recorded in the Internet connection device by a program provided in the server;
Point-to-Point Protocol (PPP) connection from a device connected to the Internet to a predetermined Internet service provider according to instructions from the server,
The IP address assigned to the Internet connection device from the Internet service provider's server during Point to Point Protocol (PPP) connection is extracted from the second log data recorded in the Internet connection device with a regular expression using a program installed on the server. Step to do,
A step in which a server sends a mail including the IP address in a body data to an external terminal on a predetermined client side;
An external terminal on the client side makes a connection request to an Internet connection device having an IP address included in the text data of the mail;
A method for accessing a LAN-side server from the outside via the Internet. In a LAN configured to include an Internet connection device having a function of connecting to an Internet service provider by dial-up connection and a server,
A method of accessing a server connected to the LAN from the outside under the condition of connecting to the Internet by dial-up connection from the LAN side,
When connecting the Internet connection device to the Internet service provider,
The server, step telephone call from the client side of the external terminal, after the ringing tone is emitted, when cleaved within a predetermined time period, it is determined that the trigger of the connection to the Internet service provider,
A server monitoring an incoming call state of an internet connection device by an AT command by a program provided in the server;
Recording the incoming call state on the server as first log data by a program provided on the server;
The server obtains the incoming call information from the first log data by a program provided in the server;
Dial-up connection from a device connected to the Internet to a predetermined Internet service provider according to instructions from the server,
Extracting the IP address assigned to the server on the LAN side from the server of the Internet service provider at the time of dial-up connection from the IP address setting file recorded on the server by a program provided in the server,
A step in which a server sends a mail including the IP address in a body data to an external terminal on a predetermined client side;
An external terminal on the client side makes a connection request to an Internet connection device having an IP address included in the text data of the mail;
A method for accessing a LAN-side server from the outside via the Internet. The acquisition of the first log data is a step of pattern matching the incoming and disconnected data with a regular expression by a program provided in the server,
Pattern matching the incoming phone number with a regular expression,
A step of comparing the set telephone number data in which the incoming telephone number data is set in advance with a regular expression;
3. A method for accessing a LAN server according to claim 1 or 2 from the outside via the Internet.

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