CN103118147A - Method, equipment and system for accessing intranet server - Google Patents
Method, equipment and system for accessing intranet server Download PDFInfo
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- CN103118147A CN103118147A CN2013100275758A CN201310027575A CN103118147A CN 103118147 A CN103118147 A CN 103118147A CN 2013100275758 A CN2013100275758 A CN 2013100275758A CN 201310027575 A CN201310027575 A CN 201310027575A CN 103118147 A CN103118147 A CN 103118147A
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Abstract
The invention provides a method, equipment and a system for accessing an intranet server. The method includes enabling CGN [carrier-grade NAT (network address translation)] equipment to preliminarily configure a public network IP (internet protocol) address and a public network port identifier according to application information of an internal server, and storing configuration information in an access list of the internal server; judging whether first configuration information matched with network access information is available in the access list of the internal server or not when the network access information which is transmitted by an extranet user terminal and contains a destination IP address, a destination port identifier and a transmission protocol is received; and enabling a port corresponding to a first public network port identifier to forward the network access information to a port which is located on the intranet server corresponding to a first private network IP address and corresponds to a first application port identifier if the first configuration information is available in the access list of the internal server. The application information of the internal server is transmitted by an intranet user terminal, and the public network IP address and the public network port identifier correspond to a private network IP address, an application port identifier and an application transmission protocol. The method, the equipment and the system have the advantage that extranet users can actively access the internal server via the address translation technology by the aid of the CGN equipment.
Description
Technical field
The embodiment of the invention relates to communication technical field, relates in particular to a kind of Intranet server access method, apparatus and system.
Background technology
Development along with the Internet, number of broadband customers increases sharply, IP has closed on exhaustion in publicly-owned address, for solving the problem of shortage of ip address, network address translation (Network Address Translation has been proposed, NAT) technology and use carrier class network address transition (Carrier-Grade NAT, CGN) equipment and support multi-terminal equipment to carry out access to netwoks.
At present, mainly solved the problem of Intranet user (being the private net address user) access outer net based on the NAT technology of CGN equipment, but, when Intranet user is built into the internal server of wishing the external user access with oneself user terminal, because the private network IP address of Intranet user terminal can't be identified by external user on public network, therefore, NAT technology based on present CGN equipment can't solve the problem that external user is initiatively accessed internal server, and prior art can solve the problem that the rear internal server of NAT conversion is used by the mapping of IP address.Be about to the information that a public network address accepts and all be mapped to a private net address, but realization will cause a private net address need to take whole ports of a public network address like this, has lost NAT conversion meaning.
Summary of the invention
For the defects of prior art, the embodiment of the invention provides a kind of Intranet server access method, apparatus and system.
One aspect of the present invention provides a kind of Intranet server access method, comprising:
CGN equipment receives the internal server solicitation message that the Intranet user terminal sends, described internal server solicitation message comprises: the private network IP address of described Intranet user terminal, and application port sign and the application transport agreement corresponding with the network application of described internal server opening;
Described CGN equipment disposes public network IP address and the public network port-mark corresponding with described private network IP address, described application port sign and described application transport agreement, and stores configuration information into the internal server access list;
Comprise purpose IP address when what described CGN equipment received that the external user terminal sends, during the access to netwoks message of destination interface sign and host-host protocol, determine whether have with described purpose IP the address in the described internal server access list, the first configuration information of described destination interface sign and described host-host protocol coupling, described the first configuration information comprises: the first private network IP address, the corresponding relation of the first application port sign and the first application transport agreement and the first public network IP address and the first public network port-mark, wherein, described the first application port sign is identical with described destination interface sign, described the first application transport agreement is identical with described host-host protocol, and described the first public network IP address is identical with described purpose IP address;
If described CGN equipment determines to have described the first configuration information, then use the port corresponding with described the first public network port-mark to interior network server corresponding to described the first private network IP address on, identify the corresponding described access to netwoks message of port repeat with described the first application port.
The present invention provides a kind of CGN equipment on the other hand, comprising:
Receiver module, be used for receiving the internal server solicitation message that the Intranet user terminal sends, described internal server solicitation message comprises: the private network IP address of described Intranet user terminal, and application port sign and the application transport agreement corresponding with the network application of described internal server opening;
Configuration module is used for configuration public network IP address and the public network port-mark corresponding with described private network IP address, described application port sign and described application transport agreement, and stores configuration information into the internal server access list;
Enquiry module, be used for comprising purpose IP address when what receive that the external user terminal sends, during the access to netwoks message of destination interface sign and host-host protocol, determine whether have with described purpose IP the address in the described internal server access list, the first configuration information of described destination interface sign and described host-host protocol coupling, described the first configuration information comprises: the first private network IP address, the corresponding relation of the first application port sign and the first application transport agreement and the first public network IP address and the first public network port-mark, wherein, described the first application port sign is identical with described destination interface sign, described the first application transport agreement is identical with described host-host protocol, and described the first public network IP address is identical with described purpose IP address;
Processing module, if be used for determining to have described the first configuration information, then use the port corresponding with described the first public network port-mark to interior network server corresponding to described the first private network IP address on, identify the corresponding described access to netwoks message of port repeat with described the first application port.
Another aspect of the invention provides a kind of Intranet server access system, comprises the external user terminal and as the Intranet user terminal of internal server, and above-mentioned CGN equipment.
The Intranet server access method that the embodiment of the invention provides, equipment and system, identify and the application transport agreement according to the private network IP address in the internal server solicitation message of Intranet user terminal transmission and open application port corresponding to network application of internal server in advance by CGN equipment, public network IP address and public network port-mark that configuration is corresponding, and store configuration information into the internal server access list, comprise purpose IP address when what receive that the external user terminal sends, during the access to netwoks message of destination interface sign and host-host protocol, determine whether to have in the internal server access list with purpose IP the address, the first configuration information of destination interface sign and host-host protocol coupling, if, illustrate that then the first application port sign in the first configuration information is identical with the destination interface sign, the first application transport agreement is identical with host-host protocol, and the first public network IP address is identical with purpose IP address, then use the port corresponding with the first public network port-mark to interior network server corresponding to the first private network IP address on, the port repeat access to netwoks message corresponding with the first application port sign.Thereby CGN equipment utilization address transition technology has solved external user when initiatively accessing the problem of internal server, guarantees the access of the external network server of Intranet user terminal.
Description of drawings
The flow chart of the Intranet server access method that Fig. 1 provides for the embodiment of the invention;
The structural representation of the CGN equipment that Fig. 2 provides for the embodiment of the invention;
The structural representation of the Intranet server access system that Fig. 3 provides for the embodiment of the invention.
Embodiment
The flow chart of the Intranet server access method that Fig. 1 provides for the embodiment of the invention, as shown in Figure 1, the method comprises:
Step 100, CGN equipment receives the internal server solicitation message that the Intranet user terminal sends, described internal server solicitation message comprises: the private network IP address of described Intranet user terminal, and application port sign and the application transport agreement corresponding with the network application of described internal server opening;
Have a plurality of public network IP address on the CGN equipment, and the public network port of the some corresponding with each public network IP address, when the Intranet user terminal is utilized by Broadband Remote Access Server (Broadband Remote Access Server, during the private network IP address access external server that BRAS) distributes, add that the packet header that comprises public network IP address sends to corresponding external server on the network access request of that CGN sends the Intranet user terminal, as to comprise private network IP address and external server to be visited IP address.Thereby CGN equipment makes a plurality of Intranet user terminals share the external network server of public network IP address by the NAT technology and conducts interviews, solved public ip address problem in short supply.In actual applications, the Intranet user terminal can be built into internal server according to using the user terminal of needs with self, internal server is supported one or more network applications, concrete network application can comprise: the http access, the smtp mail server, the ftp data access, the telnet service access and etc., the application port that different network applications is corresponding different, support different application transport agreements, because the Intranet user terminal does not have public network IP address, therefore, the Intranet user terminal sends the internal server solicitation message to CGN equipment, this internal server solicitation message comprises: the private network IP address of Intranet user terminal, and application port sign and the application transport agreement corresponding to the network application of external user open-destination with internal server, wherein, the form of expression of application port sign is numeral, for example the application port of http access is 80, the application port of smtp mail server access is 25, the application port of ftp data access is 21, the application port of telnet service access is 23 etc., and the application transport agreement specifically comprises: the application transport agreement of smtp mail server support is the POP3 agreement, the application transport agreement of NM server support is snmp protocol etc.CGN equipment is resolved the private network IP address that obtains the Intranet user terminal to the internal server solicitation message that the Intranet user terminal sends, and to application port sign and the application transport agreement of the network application of external user open-destination.Need to prove, when having at least two internal server applications identical with the application transport agreement to the application port of the network application of external user open-destination sign, CGN equipment selects the application of one of them internal server to process according to default selection strategy, concrete selection strategy comprises: the first to file strategy, be that CGN equipment is processed the internal server of first to file according to time sequencing, after processing, sends refusal the internal server of application, if many internal servers are applied for simultaneously, then refusal request indicates each internal server again to apply for; Perhaps, priority policy, even many internal servers are applied for simultaneously, CGN equipment is selected the high internal server of priority is processed according to the priority of internal server.CGN equipment can arrange concrete selection strategy according to the application needs of reality, and present embodiment is not restricted this.
Step 101, described CGN equipment dispose public network IP address and the public network port-mark corresponding with described private network IP address, described application port sign and described application transport agreement, and store configuration information into the internal server access list;
After the internal server solicitation message that CGN device parses Intranet user terminal sends, dispose application port sign and corresponding public network IP address and the public network port-mark of application transport agreement of the network application of opening with the private network IP address that obtains and internal server, and storing configuration information into the internal server access list, configuration information just refers to private network IP address, application port sign and and the corresponding relation of application transport agreement and public network IP address and public network port-mark.
Comprise purpose IP address when what CGN equipment received that the external user terminal sends, during the access to netwoks message of destination interface sign and host-host protocol, whether has the address with purpose IP in the internal server access list of setting up before determining, the first configuration information of destination interface sign and host-host protocol coupling, described the first configuration information comprises: the first private network IP address, the corresponding relation of the first application port sign and the first application transport agreement and the first public network IP address and the first public network port-mark, wherein, the first application port sign is identical with the destination interface sign, and the first application transport agreement is identical with host-host protocol and the first public network IP address is identical with purpose IP address.Because the mode of store configuration information is different in the internal server access list, the mode whether CGN equipment is determined to have in the internal server access list with marking matched the first configuration information of purpose IP address and destination interface comprises inquiry, relatively waits, for example mode one: the corresponding relation of private network IP address and application port sign and public network IP address and public network port-mark is stored successively, and example is as shown in table 1:
Table 1
Perhaps, mode two: private network IP address, the application port corresponding take public network IP address as index stores identify and the public network port-mark, and example is as shown in table 2:
Table 2
| Public network IP address | Private network IP address | The application port sign | The public network port-mark | Host-host protocol |
| 1.1 | 101.100.2 | 25 | 80 | The POP3 agreement |
| ? | 102.105.6 | 23 | 50 | Snmp protocol |
| 1.2 | 101.103.3 | 80 | 26 | Transmission Control Protocol |
Need to prove that the concrete manifestation form of the private network IP address in the above-mentioned table and public network IP address is just for the content of simplicity of explanation configuration information, do not represent the form of expression of private network IP address and public network IP address in the practical application.
Storage mode for table 1 is fit to inquiry, storage mode for table 2 is fit to relatively, specify CGN equipment as an example of table 2 example and determine whether to have in the internal server access list process with marking matched the first configuration information of purpose IP address and destination interface: the configuration information in the CGN equipment query internal server access list, judge whether to have first public network IP address identical with purpose IP address, if judge whether to have with application port sign corresponding to the first public network IP address and application transport agreement to identify first application port identical with host-host protocol with destination interface and identify and the first application transport agreement.
If CGN equipment determines to have in the internal server access list first configuration information marking matched with purpose IP address and destination interface, then use the port corresponding with the first public network port-mark to interior network server corresponding to the first private network IP address on, with the access to netwoks message of port repeat external user terminal transmission corresponding to the first application port sign, thereby the external user terminal can be accessed on the internal server and identified corresponding network application with destination interface.
Further, if CGN equipment determines not have in the internal server access list first configuration information marking matched with purpose IP address and destination interface, then send the access to netwoks refuse information to the external user terminal.
The Intranet server access method that present embodiment provides, identify and the application transport agreement according to the private network IP address in the internal server solicitation message of Intranet user terminal transmission and open application port corresponding to network application of internal server in advance by CGN equipment, public network IP address and public network port-mark that configuration is corresponding, and store configuration information into the internal server access list, comprise purpose IP address when what receive that the external user terminal sends, during the access to netwoks message of destination interface sign and host-host protocol, determine whether to have in the internal server access list with purpose IP the address, the first configuration information of destination interface sign and host-host protocol coupling, if, illustrate that then the first application port sign in the first configuration information is identical with the destination interface sign, the first application transport agreement is identical with host-host protocol, and the first public network IP address is identical with purpose IP address, then use the port corresponding with the first public network port-mark to interior network server corresponding to the first private network IP address on, the port repeat access to netwoks message corresponding with the first application port sign.Thereby CGN equipment utilization address transition technology has solved external user when initiatively accessing the problem of internal server, guarantees the access of the external network server of Intranet user terminal.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
The structural representation of the CGN equipment that Fig. 2 provides for the embodiment of the invention, as shown in Figure 2, this CGN equipment comprises: receiver module 11, configuration module 12, enquiry module 13 and processing module 14, wherein, receiver module 11 is used for receiving the internal server solicitation message that the Intranet user terminal sends, described internal server solicitation message comprises: the private network IP address of described Intranet user terminal, and application port sign and the application transport agreement corresponding with the network application of described internal server opening; Configuration module 12 is used for configuration public network IP address and the public network port-mark corresponding with described private network IP address, described application port sign and described application transport agreement, and stores configuration information into the internal server access list; Enquiry module 13 is used for comprising purpose IP address when what receive that the external user terminal sends, during the access to netwoks message of destination interface sign and host-host protocol, determine whether have with described purpose IP the address in the described internal server access list, the first configuration information of described destination interface sign and described host-host protocol coupling, described the first configuration information comprises: the first private network IP address, the corresponding relation of the first application port sign and the first application transport agreement and the first public network IP address and the first public network port-mark, wherein, described the first application port sign is identical with described destination interface sign, described the first application transport agreement is identical with described host-host protocol, and described the first public network IP address is identical with described purpose IP address; If processing module 14 is used for determining to have described the first configuration information, then use the port corresponding with described the first public network port-mark to interior network server corresponding to described the first private network IP address on, identify the corresponding described access to netwoks message of port repeat with described the first application port.
Wherein, enquiry module 13 specifically is used for: the configuration information of inquiring about described internal server access list, judge whether to have first public network IP address identical with described purpose IP address, if judge whether to have with application port sign corresponding to described the first public network IP address and host-host protocol to identify first application port identical with described host-host protocol with described destination interface and identify and the first application transport agreement.
Further, processing module 14 also is used for: if determine not have described the first configuration information, then send the access to netwoks refuse information to described external user terminal.
Function and the handling process of each module in the CGN equipment that present embodiment provides can be referring to above-mentioned embodiments of the method shown in Figure 1, and its realization principle and technique effect are similar, repeat no more herein.
The structural representation of the Intranet server access system that Fig. 3 provides for the embodiment of the invention, as shown in Figure 3, this system comprises: external user terminal 1 and as the Intranet user terminal 2 of internal server, and CGN equipment 3.Wherein, the CGN equipment that provides in the above embodiment of the present invention can be provided CGN equipment 3, external user terminal 1 and can adopt external user terminal related in the above embodiment of the present invention and Intranet user terminal as the Intranet user terminal 2 of internal server.
Function and the handling process of each module in the Intranet server access system that present embodiment provides can be referring to the embodiments of the method shown in above-mentioned, and it realizes that principle and technique effect are similar, repeats no more herein.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. an Intranet server access method is characterized in that, comprising:
CGN equipment receives the internal server solicitation message that the Intranet user terminal sends, described internal server solicitation message comprises: the private network IP address of described Intranet user terminal, and application port sign and the application transport agreement corresponding with the network application of described internal server opening;
Described CGN equipment disposes public network IP address and the public network port-mark corresponding with described private network IP address, described application port sign and described application transport agreement, and stores configuration information into the internal server access list;
Comprise purpose IP address when what described CGN equipment received that the external user terminal sends, during the access to netwoks message of destination interface sign and host-host protocol, determine whether have with described purpose IP the address in the described internal server access list, the first configuration information of described destination interface sign and described host-host protocol coupling, described the first configuration information comprises: the first private network IP address, the corresponding relation of the first application port sign and the first application transport agreement and the first public network IP address and the first public network port-mark, wherein, described the first application port sign is identical with described destination interface sign, described the first application transport agreement is identical with described host-host protocol, and described the first public network IP address is identical with described purpose IP address;
If described CGN equipment determines to have described the first configuration information, then use the port corresponding with described the first public network port-mark to interior network server corresponding to described the first private network IP address on, identify the corresponding described access to netwoks message of port repeat with described the first application port.
2. Intranet server access method according to claim 1, it is characterized in that whether having the first configuration information that mates with described purpose IP address, described destination interface sign and described host-host protocol in described definite described internal server access list and comprise:
Inquire about the configuration information in the described internal server access list, judge whether to have first public network IP address identical with described purpose IP address, if judge whether to have with application port sign corresponding to described the first public network IP address and host-host protocol to identify first application port identical with described host-host protocol with described destination interface and identify and the first application transport agreement.
3. Intranet server access method according to claim 1 and 2 is characterized in that described method also comprises:
If described CGN equipment determines not have described the first configuration information, then send the access to netwoks refuse information to described external user terminal.
4. a CGN equipment is characterized in that, comprising:
Receiver module, be used for receiving the internal server solicitation message that the Intranet user terminal sends, described internal server solicitation message comprises: the private network IP address of described Intranet user terminal, and application port sign and the application transport agreement corresponding with the network application of described internal server opening;
Configuration module is used for configuration public network IP address and the public network port-mark corresponding with described private network IP address, described application port sign and described application transport agreement, and stores configuration information into the internal server access list;
Enquiry module, be used for comprising purpose IP address when what receive that the external user terminal sends, during the access to netwoks message of destination interface sign and host-host protocol, determine whether have with described purpose IP the address in the described internal server access list, the first configuration information of described destination interface sign and described host-host protocol coupling, described the first configuration information comprises: the first private network IP address, the corresponding relation of the first application port sign and the first application transport agreement and the first public network IP address and the first public network port-mark, wherein, described the first application port sign is identical with described destination interface sign, described the first application transport agreement is identical with described host-host protocol, and described the first public network IP address is identical with described purpose IP address;
Processing module, if be used for determining to have described the first configuration information, then use the port corresponding with described the first public network port-mark to interior network server corresponding to described the first private network IP address on, identify the corresponding described access to netwoks message of port repeat with described the first application port.
5. CGN equipment according to claim 4 is characterized in that, described enquiry module specifically is used for:
Inquire about the configuration information in the described internal server access list, judge whether to have first public network IP address identical with described purpose IP address, if judge whether to have with application port sign corresponding to described the first public network IP address and host-host protocol to identify first application port identical with described host-host protocol with described destination interface and identify and the first application transport agreement.
6. according to claim 4 or 5 described CGN equipment, it is characterized in that described processing module also is used for:
If determine not have described the first configuration information, then send the access to netwoks refuse information to described external user terminal.
7. an Intranet server access system is characterized in that, comprising: external user terminal and as the Intranet user terminal of internal server, and such as each described CGN equipment of claim 4 ~ 6.
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