CN100469054C - Method and equipment in use for communication connection of redirecting network - Google Patents
Method and equipment in use for communication connection of redirecting network Download PDFInfo
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- CN100469054C CN100469054C CNB2006101133805A CN200610113380A CN100469054C CN 100469054 C CN100469054 C CN 100469054C CN B2006101133805 A CNB2006101133805 A CN B2006101133805A CN 200610113380 A CN200610113380 A CN 200610113380A CN 100469054 C CN100469054 C CN 100469054C
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Abstract
The method has two steps, which comprises: enquiring the table to decide if the data packet meets the requirement of redirection; according to the enquiring result, passing or redirecting data packet. Wherein, the enquired table can instantly shows the currently active IP address such that the invention can redirect a communication link, and can also stop the redirection of the communication link. The device comprise: IP address relay rule module, forward relay module, and backward relay module.
Description
Technical field
The invention belongs to the computer network security technology field, relate to the method and apparatus that a kind of redirecting network communicates to connect, particularly a kind of activity by monitoring internal network IP address communicates to connect particular network the method and apparatus that is redirected to the appointment receiving system.
Background technology
An internal network that connects to outside internet internet (hereinafter to be referred as external network) by network connection device may occupy a plurality of internet internet-ip address (hereinafter to be referred as the IP address), may part be used by the main frame of internal network in these IP addresses, part is not used.Use these IP address of host currently to communicate, also may not have with the external network data source.Usually the IP address that the current main frame that is communicating with the external network data source is used calls active IP address, and IP address and untapped IP address that other main frames are used are referred to as inactive IP address.
External network links to each other by a network connection device with internal network, and both sides' data interaction all will be transmitted to the other side by this network connection device.The appointment receiving system to be redirected to communicating to connect of the non-IP of enlivening of internal network address initiation in the external network data source, can on network connection device, realize by following operation:
1, at first differentiates whether belong to the connection that hope is redirected for the packet of sending from the external network data source, if be redirected to the appointment receiving system.
2, wish redirected connection at first judging whether to belong to, if be redirected to the external network data source from the packet of specifying receiving system to send.
The redirected several problems of solution that need that communicate to connect like this:
The IP address of A, an internal network may be the non-IP of enlivening address sometime, may be to enliven the IP address in another time, this reorientation method must be monitored the activity of internal network IP address, the IP address is non-when enlivening that redirecting communications connects at this, then stops redirecting communications and connect when enlivening.
B, the receiving system that has wish to collect intact packet, and the receiving system that also has wishes to send it again to after packet is handled through some, is revised as address of receiving system or the like such as the destination address with packet.
C, can not allow the external network data source feel to communicate to connect to be redirected, the packet that returns to the external network data source must look and resemble send from that non-IP of enlivening address that original attempt connects the same.
Yet in known systems, there is not to solve rightly the scheme of above-mentioned several problems at present.Usually more approaching method is: fixedly install a certain partial interior network ip address for active, a part is non-active in addition, on network connection device, be provided with one again and handle and transmit passage, this passage connects to receiving system, at last receiving system is redirected to communicating to connect by this processing and forwarding passage of the non-IP of enlivening address initiation in the external network data source.The problem that this method exists is: can not monitor which internal network IP address is to enliven, and which is non-active, can not be dynamically determines whether that according to the activity of IP address being redirected one communicates to connect.That is to say also there is not the method that to monitor internal network IP address activity and connect according to this activity redirecting communications in real time in the prior art.
Summary of the invention
The purpose of this invention is to provide a kind of activity of monitoring internal network IP address, and external network communicated to connect the receiving system that is redirected to appointment to what initiated the non-IP of enlivening of internal network address, and become the method that stops to be redirected when enlivening in this IP address; And the same design of a kind of basis method that the data that mail to external network from receiving system are redirected.
Another object of the present invention provides the network connection device that is used to realize said method, and this device is called redirected gateway, and this gateway has the passage of a company to external network, and company is to the passage of internal network, and company is to the passage of receiving system.
The method that described redirecting network communicates to connect is a kind of two-step process, and whether the differentiation packet of promptly at first tabling look-up meets redirected requirement, lets pass according to Query Result thereafter or redirected this packet.Because the table that wherein will inquire about is immediately reflecting current active IP address, this method just can be redirected one immediately and communicates to connect like this, also can stop redirected this immediately and communicate to connect.
Above-mentioned reorientation method can be divided into forward and reverse two kinds of situations according to the flow direction of packet.Wherein said forward refers to the direction from the external network data source to receiving system, the direction of described reverse finger from receiving system to the external network data source.
Wherein, the forward processing procedure in the reorientation method is finished by an IP address forwarding rule module and a forward forwarding module.IP address is wherein transmitted rule module and is used to judge whether the external network data source be redirected to communicating to connect of inner network data target initiation, and its formation has following feature:
1, this module comprises that IP address transmits rule list, and what this table was used to register internal network enlivens the IP address.Each list item of this table comprises following attribute: an IP address, a residue time-to-live of constantly successively decreasing in time automatically.
2, the internal network data source all needs to transmit by the redirected gateway of two network junctions to the packet that the external network data target sends, whether the source address of at first inquiring about this packet when redirected gateway is whenever received such packet from internal network has registered to the IP address is transmitted in the list item of rule list, if this IP address has registered to a list item, then the residue time-to-live with this list item the inside reverts to initial value, if this IP address is not registration also, a then newly-built list item is registered this IP address, and its residue time-to-live is set to initial value.
3, travel through an IP address at regular intervals and transmit rule list, be decremented to 0 list item deletion the residue time-to-live.
Forward forwarding module wherein constitute following feature:
1, this module comprises packet and transforms parameter list, and this table is used to write down that each that be redirected communicates to connect and to the forward of the affiliated packet of this connections and the parameter of reverse transformation.The forward transformation can be so that packet meets the requirement of receiving system, reverse transformation can be so that returning to the packet in external network data source looks and resembles send from that non-IP of enlivening address that original attempt connects the same, that is to say that the external network data source can't feel to communicate to connect to be redirected.The concrete forward transformation and the strategy of reverse transformation can be pre-defined by the user.
2, this packet each list item of transforming parameter list comprises four attributes: communicate to connect, forward transforms parameter list, reverse transformation parameter list, a residue time-to-live of constantly successively decreasing in time.
3, each IP address is transmitted all can search when packet of rule module transmission is given the forward forwarding module and whether Already in to be communicated to connect packet under this packet and transform in the parameter list, if exist, this residue time-to-live that communicates to connect list item reverts to initial value.This forward processing method in the back also can be mentioned.
4, travel through a packet at regular intervals and transform parameter list, be decremented to 0 list item deletion the residue time-to-live.
The detailed step of the forward processing method that whole redirecting communications connects is described below:
1) after a packet from external network arrives redirected gateway, whether the IP address is transmitted rule module and is at first inquired about its destination address and transmit in the rule list in the IP address, if, the flow direction of this packet of nonintervention then, if not, give the forward forwarding module with packet and handle.
2) the data query bag was transformed parameter list after the forward forwarding module was received packet, judge whether this packet belongs to certain that write down in the table and communicate to connect, if, then taking out this forward that communicates to connect transforms parameter and with this parameter packet is done the forward transformation, send to receiving system after transformation finishes, the residue time-to-live that simultaneously this is communicated to connect list item reverts to initial value.If find that this packet does not belong to write down in the table any and communicates to connect, then transforming strategy according to this forward that one of packet structure communicates to connect, basis is predetermined determines forward transformation parameter, determines reverse transformation parameter according to predetermined reverse transformation strategy, then this is communicated to connect and forward is transformed parameter, reverse transformation parameter, initially remained the time-to-live and be combined into a list item and be inserted into packet and transform in the parameter list, transform according to described forward at last and send to receiving system after parameter is done the forward transformation to packet.
The reverse process method transforms parameter list by above-mentioned packet and a reverse forwarding module is finished, and wherein, reverse forwarding module comprises: packet is transformed the query unit of parameter list, is used for inquiring about the packet transformation parameter list of forward forwarding module; Packet is transformed the unit, is used for according to the reverse transformation parameter that communicates to connect that is queried to packet being done reverse transformation; The packet transmitting element is used for improved packet is sent to the external network data source.
The reverse process step is described below: reverse forwarding module receives that the packet of inquiring about in the forward forwarding module after the packet from receiving system transforms parameter list, judge whether this packet belongs to that certain communicates to connect in the table, if, then take out this reverse transformation parameter that communicates to connect and packet is done reverse transformation, send to the external network data source after transformation finishes with this parameter.If find that this packet does not belong to write down in the table any and communicates to connect, then the flow direction of this packet of nonintervention.
Technique effect of the present invention is:
1) realized real-time monitoring, and can immediately be redirected external network to communicating to connect that initiate the non-IP of enlivening address, inside to the activity of inner network ip address.
When 2) having realized the redirecting communications connection procedure to the flexible transformation of packet.
Those skilled in the art will appreciate that the reverse and forward treatment step in the above-mentioned reorientation method is based on the aspect of same inventive concept, two symmetries of the same goal of the invention of realization.In practice, the reorientation method that does not comprise the reverse process step equally also can be realized purpose of the present invention and reach effect of the present invention.The adding of reverse process step then can make the present invention more perfect.
Description of drawings
Fig. 1 is the external relations schematic diagram of redirecting communications jockey of the present invention (being redirected gateway);
Fig. 2 is the forward process chart of redirecting communications method of attachment;
Fig. 3 is the reverse process flow chart of redirecting communications method of attachment.
Embodiment
Below with reference to accompanying drawing of the present invention, describe the present invention in detail in conjunction with most preferred embodiment.
As shown in Figure 1, be to be redirected the schematic diagram that gateway connects external network, internal network and receiving system.In this enforcement, be redirected the computer system that gateway adopts one three network interface card, connect external network, internal network, receiving system respectively.
As shown in Figure 2, the forward process chart in the method for attachment of expression redirecting communications.
(1) owing to external network, internal network, receiving system are connected on respectively on the different network interfaces of this device computer system, so this example can be come wherefrom according to the reception network interface judgment data bag of packet.In step (1), suppose that a tcp data bag from external network arrives this computer.
(2) according to the destination address inquiry IP addresses forwarding table of packet,, illustrate that this packet mails to one and enlivens the IP address, be redirected the flow direction of this packet of gateway nonintervention, directly let pass if inquire.If do not inquire, illustrate that then this packet mails to the non-IP of an enlivening address, be redirected gateway and give the processing of forward forwarding module packet.
(3) the forward forwarding module takes out the descriptor that agreement, purpose and the source address etc. of this packet communicate to connect and constitutes an inquiry combination and transform parameter list with this query composition packet, and whether differentiation has certain to communicate to connect can mate this combination.If on the coupling, do not forward next step to,, directly forward step (5) to if coupling has gone up.
(4) description that communicates to connect that goes out according to the rapid inquiry composite construction that generates of previous step, again in conjunction with predefined forward and reverse transformation strategy, generate forward and reverse transformation parameter list, the description that will communicate to connect at last, forward and reverse transformation parameter list and initialization residue time-to-live form a list item and are inserted in the packet transformation parameter list.Suppose that predefined forward modification scheme is that modification packet rs destination address is a receiving system, then forward is transformed parameter list information such as the IP address of receiving system, port.Suppose reverse modification scheme be revise the source data packet address for originally communicate to connect attempt originally connect to the non-IP of enlivening address, then reverse transformation parameter list has this non-IP of enlivening address and port thereof.
(5) transform the forward that communicates to connect under this packet of taking-up the parameter list from packet and transform parameter information and packet is done the forward transformation, the residue time-to-live that simultaneously this is communicated to connect list item reverts to initial value.Be specially in the present embodiment: transform the IP address of parameter, the destination address and the destination interface of port replacement data bag with forward, and will remain the time-to-live and revert to initial value.
(6) because receiving system has been pointed in the packet rs destination address, this packet is put back to get back to behind the network protocol stack passage of computer system reaches receiving system.
As shown in Figure 3, the reverse process flow chart in the method for attachment of expression redirecting communications.The reverse process method is described below:
(1) packet was transformed parameter list under reverse forwarding module was received and inquired about the forward forwarding module after the packet from receiving system, judged whether this packet belongs to that certain communicates to connect in the table.If, forwarded for the 2nd step to, if not, the flow direction of this packet of nonintervention then.
(2) certain communicates to connect in the table if packet belongs to, and then takes out this reverse transformation parameter that communicates to connect and with this parameter packet is done reverse transformation, sends to the external network data source after transformation finishes.To transform the reverse transformation parameter that parameter list deposits be the former non-IP of enlivening address and port thereof to packet in the present embodiment, so with the source address and the port of this IP address and port replacement data bag, this packet is sent to external network then.Note in the present embodiment because the source address and the port of packet are replaced by the non-IP of enlivening address and port thereof whether being redirected so the external network data source can't perception originally communicates to connect.
As mentioned above, the present invention is by checking that internal network outwards sends packet and determines active IP address, and this makes that this forwarding framework is short and sweet, rapidly and efficiently.The present invention be applicable to various needs flexibly, the situation of intercepted data bag snugly, have good cross-platform compatibility, extensibility and practicality.
Described embodiment uses on the gigabit level gateway of applicant's development, obtained good effect, not only realized being redirected immediately that specific communications connects, and compared forward efficiency with scheme in the past and improved 50%, realized purpose of the present invention satisfactorily.The present invention has good practicability and popularizing application prospect.
Although disclose specific embodiments of the invention and accompanying drawing for the purpose of illustration, its purpose is to help to understand content of the present invention and implement according to this, but it will be appreciated by those skilled in the art that: without departing from the spirit and scope of the invention and the appended claims, various replacements, variation and modification all are possible.For example, be redirected gateway except being that three network interface cards constitute three passages respectively and connect to external network, internal network and receiving system, can also have only two network interface cards, wherein one constitutes a passage even to external network, one connects internal network, receiving system takies the IP address of partial interior network, just exists passage to connect to internal network on such network interface card, also exists passage to connect to receiving system.And for example, be respectively DNAT and un_DNAT operation if be redirected the forward and the reverse transformation strategy of gateway, then forward and reverse forwarding module can use the DNAT module of linux operating system to realize, and this module itself has comprised DNAT and un_DNAT operation.In addition, the forward of redirection module and reverse transformation strategy also can be do-nothing operations.Therefore, the present invention should not be limited to this specification most preferred embodiment and the disclosed content of accompanying drawing, and the scope of protection of present invention is as the criterion with the scope that claims define.
Claims (5)
1. one kind is used for the method that redirecting network communicates to connect, and may further comprise the steps:
(1) after the packet from external network arrives, at first inquires about its destination address and whether transmit in the rule list, if then the flow direction of this packet of nonintervention is handled otherwise give the forward forwarding module with this packet in the IP address;
(2) the data query bag was transformed parameter list after the forward forwarding module was received described packet, judge whether this packet belongs to certain that write down in the table and communicate to connect, if, then take out this forward that communicates to connect transformation parameter this packet is done the forward transformation, after finishing, transformation sends to predetermined receiving system, the residue time-to-live that simultaneously this is communicated to connect list item reverts to initial value, the described residue time-to-live constantly successively decreases in time, be decremented at 0 o'clock and delete this and communicate to connect list item, otherwise change next step over to;
(3) communicate to connect according to one of described packet structure, and transform strategy according to predetermined forward and determine forward transformation parameter, determine reverse transformation parameter according to predetermined reverse transformation strategy, then this is communicated to connect and forward is transformed parameter, reverse transformation parameter, initially remained the time-to-live and be combined into a list item and be inserted into packet and transform in the parameter list, transform according to described forward at last and send to receiving system after parameter is done the forward transformation to packet;
(4) receive packet from receiving system after, inquire about described packet and transform parameter list, judge whether this packet belongs to packet and transform that certain communicates to connect in the parameter list, if, then take out this reverse transformation parameter that communicates to connect and packet is done reverse transformation with this parameter, after finishing, transformation sends to the external network data source, otherwise the flow direction of this packet of nonintervention.
2. one kind is used for the device that redirecting network communicates to connect, and comprising: rule module, forward forwarding module and reverse forwarding module are transmitted in the IP address;
Described IP address is transmitted rule module and is comprised that an IP address transmits rule list, and what this table was used to register internal network enlivens the IP address, and its each list item comprises following attribute: an IP address, a residue time-to-live of constantly successively decreasing in time; Described IP address is transmitted rule module and is used to judge whether the external network data source be redirected to communicating to connect of inner network data target initiation, and whether decision gives the forward forwarding module with packet;
Described forward forwarding module comprises packet and transforms parameter list, and the list item that described packet is transformed the parameter list record comprises four attributes: communicate to connect, forward transforms parameter, reverse transformation parameter and a residue time-to-live of constantly successively decreasing in time; If the packet that the rule module of transmitting secondary IP address transmits does not belong to any the communicating to connect in the packet transformation parameter list, list item of forward forwarding module structure is inserted into packet and transforms parameter list; Described forward forwarding module carries out sending to receiving system after the forward transformation to packet according to the forward transformation parameter that packet is transformed in the parameter list;
Described reverse forwarding module is used for whether packet being carried out reverse transformation by the reverse transformation parameter decision of data query bag transformation parameter list and sends to the external network data source.
3. device as claimed in claim 2 is characterized in that, it is dynamic change that rule list is transmitted in described IP address, and its variation is as follows:
(1) whether the source address of just checking this packet when described device is received a packet from internal network has been registered in the IP address and has transmitted rule list, if register, then the residue time-to-live attribute with this list item returns to initialization value, otherwise this source address in the registration, and give the initialization value of residue time-to-live for being scheduled to;
(2) the residue time-to-live attribute in each list item all constantly successively decreases in time, and it is deleted to be decremented to 0 o'clock this list item.
4. device as claimed in claim 2 is characterized in that, it is dynamic change that described packet is transformed parameter list, and its variation is as follows:
(1) when receiving that the packet that rule module transmits is transmitted in IP address, the forward forwarding module just checks that whether communicating to connect under this packet be registered in packet and transform parameter list, if register, then the residue time-to-live attribute with this list item returns to initialization, otherwise generate affiliated the communicating to connect of this packet, be registered on the table then, and give the initialization value of residue time-to-live for being scheduled to;
(2) the residue time-to-live attribute in each list item all constantly successively decreases in time, and it is deleted to be decremented to 0 o'clock this list item.
5. device as claimed in claim 2 is characterized in that, described reverse forwarding module comprises:
Packet is transformed the query unit of parameter list, is used for inquiring about the packet transformation parameter list of forward forwarding module;
Packet is transformed the unit, is used for according to the reverse transformation parameter that communicates to connect that is queried to packet being done reverse transformation;
The packet transmitting element is used for improved packet is sent to the external network data source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101133805A CN100469054C (en) | 2006-09-26 | 2006-09-26 | Method and equipment in use for communication connection of redirecting network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101133805A CN100469054C (en) | 2006-09-26 | 2006-09-26 | Method and equipment in use for communication connection of redirecting network |
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| CN1960330A CN1960330A (en) | 2007-05-09 |
| CN100469054C true CN100469054C (en) | 2009-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101133805A Expired - Fee Related CN100469054C (en) | 2006-09-26 | 2006-09-26 | Method and equipment in use for communication connection of redirecting network |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106566B (en) * | 2007-06-28 | 2011-11-30 | 深圳市中科新业信息科技发展有限公司 | A webpage access redirection method and system in network security control |
| CN103327134B (en) * | 2013-06-13 | 2016-09-21 | 国家电网公司 | A kind of network data reorientation method based on DHCP service and device |
| CN104639436B (en) * | 2013-11-07 | 2018-06-22 | 中兴通讯股份有限公司 | Remaining life span ageing method and device |
| CN106612266B (en) * | 2015-10-27 | 2020-05-08 | 阿里巴巴集团控股有限公司 | Network forwarding method and equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6169610B1 (en) * | 1996-10-25 | 2001-01-02 | Ricoh Company, Ltd. | Network communication system |
| CN1411238A (en) * | 2002-05-31 | 2003-04-16 | 华为技术有限公司 | Method of realizing communication equipment output reorientation |
| CN1429002A (en) * | 2001-12-21 | 2003-07-09 | 诺基亚有限公司 | Re-direction from mobile network information to electronic mail |
| CN1461127A (en) * | 2002-05-20 | 2003-12-10 | 三星电子株式会社 | Grouping redirectional method for network processor |
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2006
- 2006-09-26 CN CNB2006101133805A patent/CN100469054C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6169610B1 (en) * | 1996-10-25 | 2001-01-02 | Ricoh Company, Ltd. | Network communication system |
| CN1429002A (en) * | 2001-12-21 | 2003-07-09 | 诺基亚有限公司 | Re-direction from mobile network information to electronic mail |
| CN1461127A (en) * | 2002-05-20 | 2003-12-10 | 三星电子株式会社 | Grouping redirectional method for network processor |
| CN1411238A (en) * | 2002-05-31 | 2003-04-16 | 华为技术有限公司 | Method of realizing communication equipment output reorientation |
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