CN103124227A - Forward isolation device and isolation gateway combined link status detection method - Google Patents
Forward isolation device and isolation gateway combined link status detection method Download PDFInfo
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- CN103124227A CN103124227A CN2012105367075A CN201210536707A CN103124227A CN 103124227 A CN103124227 A CN 103124227A CN 2012105367075 A CN2012105367075 A CN 2012105367075A CN 201210536707 A CN201210536707 A CN 201210536707A CN 103124227 A CN103124227 A CN 103124227A
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Abstract
The invention provides a forward isolation device and isolation gateway combined link status detection method which includes steps: server load balancing groups are arranged on an isolation gateway at the detection end; the virtual internet protocol (IP) of each server load balancing group respectively corresponds to a server arranged on an isolation gateway at the response end; the address translation relation between the isolation gateway at the detection end and the isolation gateway at the response end is respectively set on each forward isolation device; address translation strategies corresponding to each server access are respectively set on the isolation gateway at the response end, and an access control list is led to be matched with a detection message in a set format; the health conditions of all links are detected through a private health detection mechanism based on a transmission control protocol (TCP); and the isolation gateway at the detection end judges the link statuses of all the forward isolation devices according to a response message. The forward isolation device and isolation gateway combined link status detection method achieves detection of the link statuses between the forward isolation devices and the servers on the condition of combining the isolation gateway and the forward isolation devices, accordingly can supply reference to a dynamic flow regulation and sharing algorithm, and achieves the effect of intelligent flow sharing.
Description
Technical field
The present invention relates to load-balancing technique, particularly relate to a kind of forward spacer assembly and be combined the Link State detection method of using with the isolation gateway.
Background technology
Forward spacer assembly: the i.e. private network of electric power system network Special safety spacer assembly of forward type, a kind of by with various control function specialized hardware, a safety device between dispatching data network and public information network is used for place of safety I/II to the one-way data transmission of place of safety III.
Isolation gateway: based on including but not limited to the unidirectional forwarding of realization such as router, switch or server and to its two connected gateways that network is isolated.
Load balancing: be the load-balancing algorithm according to configured in advance, the customer flow of access same IP address is assigned on different servers.It is shared user's flow on the server of many equivalences by Virtual Service technology, server Health Check technology with by the flow forwarding technology.As if what these technology were seen access for the calling party angle is a station server, and be actually and can share on different servers by certain load-balancing algorithm, indirectly improve the disposal ability of server, also indirectly improved stability and the extensibility of server.
Now great majority isolation gateways are all integrated load-balancing technique, but this piece of its security protection generally can only be accomplished safety inspection and the control of IP layer and common application layer protocol, can not accomplish internetwork " physical isolation ", therefore in the industry that some specific safety is had relatively high expectations, for example, electric power system dedicated network spacer assembly is all generally to increase to have disposed safe forward spacer assembly to carry out the physical layer isolation.
Be subject to the particularity of its hardware environment and Business Processing due to the forward spacer assembly, relate to the functions such as the switching of data, isolation, its transfer capability to service message is generally on the low side, so need to get up to improve the disposed of in its entirety performance to many forward spacer assembly equipment stackings, after stacking by the forward spacer assembly, carry out technical combination to reach complementary effect with the load-balancing function of isolating gateway.
As shown in Figure 1, Fig. 1 is the application networking schematic diagram of being combined with the isolation gateway based on the forward spacer assembly, in forward spacer assembly situation:
In network A, network B networking, two forward spacer assemblys of isolating between gateway A, isolation gateway B have carried out the stacking processing of cluster, to make up the general deficiency on the low side of its transfer capability to service message, simultaneously in order to allow each stacking forward spacer assembly share service traffics, two isolation gateways before and after the forward spacer assembly possess load-balancing function, thereby reach the advantage that integral body is utilized network collection forward spacer assembly and isolation gateway, satisfy high security and high bandwidth business demand.
At present, the most network equipment is all supported the ICMP agreement, the load-balancing function of isolation gateway is by using the periodic health probe messages based on the ICMP agreement, and receive the message that corresponding ICMP request is responded, judge the health status of real server, flow is assigned on healthy server by the strategy that configures.
Yet, due to the fail safe of forward spacer assembly self and the robustness of realization, when the communication link appearance of forward spacer assembly is congested, the forward spacer assembly opposite side of surveying can't be made response because not receiving ICMP health probe messages, and the load balancing icmp probe function of isolating like this gateway just can't open effect.And general forward spacer assembly has interception function to the health probe messages of ICMP agreement, for example, the forward spacer assembly can not allow the icmp echo message pass through, so can't carry out by direct detection forward spacer assembly opposite side equipment interface the Health Check of load-balancing device yet.
In sum, survey the Link State Detection Techniques of mechanism based on above-mentioned health, the accurate Link State between perception forward spacer assembly and opposite end server, the machine in case the forward spacer assembly equipment in cluster is delayed, the isolation gateway can't be known the existing state of forward spacer assembly, still service message is forwarded to the forward spacer assembly of the machine state of delaying, thereby causes service disconnection.
Summary of the invention
Based on this, be necessary for knowing the existing state of forward spacer assembly based on above-mentioned isolation gateway, still service message is forwarded to the forward spacer assembly of the machine state of delaying, the problem that causes service disconnection, the Link State detection method that provides a kind of forward spacer assembly to be combined application with the isolation gateway.
A kind of forward spacer assembly is combined the Link State detection method of using with the isolation gateway, comprise the steps:
S100 shuts configuration server load balancing group at the end of probe separation net; Wherein, a server shutting corresponding to the responder separation net of the empty IP of each described server load balancing group;
S200, the address transition relation between configuration end of probe isolation gateway on each forward spacer assembly and responder isolation gateway;
S300 shuts the address transition strategy that configures respectively corresponding to each server access at the responder separation net, and probe messages of setting form of arranging access control list coupling;
S400 surveys based on the privately owned health of Transmission Control Protocol the health status that mechanism detects each link;
Concrete testing process comprises as follows:
According to the probe messages of described empty IP transmission based on Transmission Control Protocol, according to described address transition relation, described probe messages is carried out address transition by end of probe isolation gateway on the forward spacer assembly, then be sent to described responder isolation gateway;
To be converged by the reference address of the probe messages of each forward spacer assembly input according to described address transition strategy at responder isolation gateway, and be converted to the source address that the responder separation net is shut a server, and according to server corresponding to this source address described empty IP of access;
Responder isolation gateway generates response message and is back to end of probe isolation gateway according to the access to the responder server;
S500 judges the Link State at each forward spacer assembly place according to described response message at end of probe isolation gateway.
Above-mentioned forward spacer assembly is combined the Link State detection method of using with the isolation gateway, be directed to the forward spacer assembly and be combined application scenarios with the isolation gateway, the business process rule of configuration forward spacer assembly, the forward spacer assembly oppositely can be defined as two states that business can be used by message, realized the isolation gateway in conjunction with forward spacer assembly scene under to forward spacer assembly and server between the detection of Link State, thereby can provide reference for dynamically adjusting the traffic sharing algorithm, reach flow quantity intelligent and share effect.
Description of drawings
Fig. 1 is the application networking schematic diagram of being combined with the isolation gateway based on the forward spacer assembly;
Fig. 2 is that forward spacer assembly of the present invention and isolation gateway are combined the Link State detection method flow chart of using;
Fig. 3 is an embodiment forward spacer assembly and isolation gateway group system schematic diagram
Fig. 4 is the data segment format structure schematic diagram of probe messages in an embodiment.
Embodiment
forward spacer assembly of the present invention is combined the Link State detection method of using with the isolation gateway, be directed to the forward spacer assembly in the isolation gateway is combined the scene of using, due to the no-protocol stack of forward spacer assembly own, the isolation gateway can't directly be done the problem of detection to the business service state of forward spacer assembly, a kind of TCP detection method that passes through the forward spacer assembly under forward spacer assembly application scenarios is provided, solved the isolation gateway machine-processed to the detection of lower end appliance services availability in deployment forward spacer assembly situation, the intelligent detecting of realization to Link State.
The embodiment of the Link State detection method used of forward spacer assembly of the present invention being combined with the isolation gateway below in conjunction with accompanying drawing is described in detail.
Fig. 2 shows forward spacer assembly of the present invention and is combined the flow chart of the Link State detection method used with the isolation gateway, comprises the steps:
S100 shuts configuration server load balancing group at the end of probe separation net; Wherein, a server shutting corresponding to the responder separation net of the empty IP of each described server load balancing group;
As shown in Figure 3, Fig. 3 is an embodiment forward spacer assembly and isolation gateway group system schematic diagram, end of probe isolation gateway need to configure two groups of SLB groups, wherein the empty IP (VIP) of group (a) is 10.0.0.100, the real address of corresponding the first forward spacer assembly is 192.168.1.10 and 192.168.1.11, the empty IP of group (b) is 10.0.0.101, the real address of corresponding the second forward spacer assembly is 192.168.1.101 and 192.168.1.102, if more forward spacer assembly cluster is arranged, the corresponding real address of similar configuration.
S200, the address transition relation between configuration end of probe isolation gateway on each forward spacer assembly and responder isolation gateway;
Isolation inspection data effect due to the forward spacer assembly, the address of the data that two ends isolation gateway transmits on the forward spacer assembly need to be changed, as shown in Figure 3, configuration is as the forward spacer assembly transformational relation of cluster, wherein, the 10.0.0.1 that is configured to of the first forward spacer assembly turns 192.168.1.0 corresponding conversion 192.168.2.10 and turns 20.0.0.1, and the second forward spacer assembly is configured to 10.0.0.1 and turns 192.168.1.11 corresponding conversion 192.168.2.11 and turn 20.0.0.1.
S300 shuts at the responder separation net address transition strategy that configuration is accessed between corresponding to each server, and probe messages of setting form of arranging access control list coupling;
As shown in Figure 3, address after the corresponding independent conversion of this probe messages, be the empty IP of the server of responder isolation gateway, by the address transition strategy, to be converted to by the source address of end of probe access the virtual IP address of a given server that connects under responder isolation gateway, making at the server to responder isolation gateway is when conducting interviews, and the access of the serviced probe messages of seeing is the access of carrying out with the source address of a given server of its same subnet; For example, be configured to turn from 192.168.2.1x the message of 20.0.0.1, the source address of conversion is 20.0.0.100; Be configured to turn from 192.168.2.1x the message of 20.0.0.3, the source address of conversion is 20.0.0.101.
S400 surveys based on the privately owned health of Transmission Control Protocol the health status that mechanism detects each link;
Concrete testing process comprises as follows:
According to the probe messages of described empty IP transmission based on Transmission Control Protocol, according to described address transition relation, described probe messages is carried out address transition by end of probe isolation gateway on the forward spacer assembly, then be sent to described responder isolation gateway;
To be converged by the reference address of the probe messages of each forward spacer assembly input according to described address transition strategy at responder isolation gateway, and be converted to the source address that the responder separation net is shut a server, and according to server corresponding to this source address described empty IP of access;
Responder isolation gateway generates response message and is back to end of probe isolation gateway according to the access to the responder server; For reverse response message, the session entry that creates in the process that E-Packets according to forward directly returns to end of probe isolation gateway.
S500 judges the Link State at each forward spacer assembly place according to described response message at end of probe isolation gateway.
For more clear technology of the present invention, set forth preferred embodiment below in conjunction with accompanying drawing.
For response message, can be full 0 (0x00) or complete 1 (0xFF) for data content.
Link State step for each forward spacer assembly of judgement place specifically comprises as follows:
If it is complete 1 response message that described end of probe isolation gateway receives data content, judge that this link is health status;
If described end of probe isolation gateway receives the response message that data content is full 0, judge that this link is congestion state;
If described end of probe isolation gateway is not received the corresponding response message of described probe messages in setting-up time, judge that this link is interrupt status.
When normally during the server of access response end, illustrate that the link that is detected is congestion state from end of probe isolation gateway, responder is isolated the response message of gateway response full 0; When normally during the server of access response end, illustrate that the link that is detected is health status from end of probe isolation gateway, responder is isolated the response message of gateway response complete 1; When server that can't the access response end from end of probe isolation gateway, illustrate that the link that is detected is interrupt status, because probe messages is abandoned by randomness, responder isolation gateway can not receive probe messages and can't make response, when continuous a plurality of probe messages do not meet with a response, represent that this link interrupts.
For probe messages, its data segment form as shown in Figure 4, whole message comprises IP Header, TCPHeader, DATA three parts, wherein DATA (data) part comprises:
Magic number (being defined as " MagicNum ") is used for the fail safe verification, and length can for 2 bytes, can be fixed as 0xDCBA;
Version number's (being defined as " Ver ") is used for the expansion of agreement subsequent upgrade, and length can be 1 byte, and version can be 0x1;
Length value (being defined as " Len ") is used for representing the follow-up private data length information that carries that length can be 1 byte, can be 0x5;
Data content (being defined as " Data ") is used for carrying probe messages content, and length is decided according to concrete message content, can be 0x53/0x43/0x4f/0x55/0x54, corresponding character string " SCOUT "; Verification and (being defined as " CheckSum "), for the CRC check value that records all data, length can be 2 bytes, i.e. CRC (MagicNum+Ver+Len+Data);
For step S500, dynamically adjust the traffic sharing algorithm according to described Link State, for example, new forward business datum is dispensed to the link of health status, time-out is dispensed to congested link with new forward business datum, stops the forward business datum is dispensed to the link of interrupt status.
In one embodiment, can increase of the present inventionly based on TCP link healthprobe method in isolation gateway original load-balancing algorithm module, be combined with scene thereby can satisfy with the forward spacer assembly.Congestion situation occurs for Link State, need conversational list aging algorithm module accelerated ageing relevant link service conversation.Load-balancing algorithm calculates newly-built session and selects link to come the distribution service data according to actual situation address mapping relation and the equalization algorithm of current active link.
forward spacer assembly of the present invention is combined the Link State detection method of using with the isolation gateway, under the scene of forward spacer assembly one-way communication, because the stringency of forward spacer assembly to reverse packet filtering, preposition load equalizer can't and be hung thereafter server or equipment carries out state detection to the forward spacer assembly usually, on the basis of analyzing forward spacer assembly Principle of Communication, the forward spacer assembly oppositely can be defined as two states that business can be used by message, realized under this scene the detection method to forward spacer assembly service state, and by this detection method, Intellisense forward spacer assembly state, thereby dynamically adjust the traffic sharing algorithm, reach flow quantity intelligent and share effect.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.Should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (6)
1. a forward spacer assembly is combined the Link State detection method of using with the isolation gateway, it is characterized in that, comprises the steps:
S100 shuts configuration server load balancing group at the end of probe separation net; Wherein, a server shutting corresponding to the responder separation net of the empty IP of each described server load balancing group;
S200, the address transition relation between configuration end of probe isolation gateway on each forward spacer assembly and responder isolation gateway;
S300 shuts the address transition strategy that configures respectively corresponding to each server access at the responder separation net, and probe messages of setting form of arranging access control list coupling;
S400 surveys based on the privately owned health of Transmission Control Protocol the health status that mechanism detects each link;
Concrete testing process comprises as follows:
According to the probe messages of described empty IP transmission based on Transmission Control Protocol, according to described address transition relation, described probe messages is carried out address transition by end of probe isolation gateway on the forward spacer assembly, then be sent to described responder isolation gateway;
To be converged by the reference address of the probe messages of each forward spacer assembly input according to described address transition strategy at responder isolation gateway, and be converted to the source address that the responder separation net is shut a given server, then according to server corresponding to this source address described empty IP of access;
Responder isolation gateway generates response message and is back to end of probe isolation gateway according to the access to the responder server;
S500 judges the Link State at each forward spacer assembly place according to described response message at end of probe isolation gateway.
2. forward spacer assembly according to claim 1 is combined the Link State detection method of using with the isolation gateway, it is characterized in that, described response message is that data content is full 0 or complete 1.
3. forward spacer assembly according to claim 2 is combined the Link State detection method of using with the isolation gateway, it is characterized in that, described step S500 judges that according to described response message the Link State at each forward spacer assembly place specifically comprises at end of probe isolation gateway:
If it is complete 1 response message that described end of probe isolation gateway receives data content, judge that this link is health status;
If described end of probe isolation gateway receives the response message that data content is full 0, judge that this link is congestion state;
If described end of probe isolation gateway is not received the corresponding response message of described probe messages in setting-up time, judge that this link is interrupt status.
4. forward spacer assembly according to claim 1 is combined the Link State detection method of using with the isolation gateway, it is characterized in that, the data segment of described probe messages comprises:
Magic number is used for the fail safe verification;
Version number is used for the expansion of agreement subsequent upgrade;
Length value is used for representing the follow-up private data length information that carries;
Data content is used for carrying probe messages content;
Verification and, be used for recording the CRC check value of all data.
5. forward spacer assembly according to claim 4 is combined the Link State detection method of using with the isolation gateway, it is characterized in that, the length of described Magic number is 2 bytes, described version number length is 1 byte, the length of described length value is 1 byte, described verification and length be 2 bytes.
6. forward spacer assembly according to claim 1 is combined the Link State detection method of using with the isolation gateway, it is characterized in that, described S500 further comprises:
Dynamically adjust the traffic sharing algorithm according to described Link State.
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| CN201210536707.5A CN103124227B (en) | 2012-12-11 | 2012-12-11 | Forward spacer assembly and the Link State detection method of isolating gateway connected applications |
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