CN105991347A - Redirection method of DNS request message and device - Google Patents
Redirection method of DNS request message and device Download PDFInfo
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- CN105991347A CN105991347A CN201510216658.0A CN201510216658A CN105991347A CN 105991347 A CN105991347 A CN 105991347A CN 201510216658 A CN201510216658 A CN 201510216658A CN 105991347 A CN105991347 A CN 105991347A
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Abstract
The present invention provides a redirection method of a DNS request message and a redirection device of a DNS request message. The redirection method and redirection device are applied to network equipment. The method includes the following steps that: after a DNS request message is received, a link of which the current load pressure is minimum is determined; a DNS server having optimal performance, which can be connected with currently-stored links, is determined as a target DNS server; the DNS request message is redirected to the target DNS server. With the redirection device and the redirection method provided by the embodiments of the invention adopted, the network equipment can determine and store the DNS server having optimal performance which can be connected with each link; after receiving the DNS request message sent by a client, the network equipment determines the link of which the current load pressure is minimum; the DNS request message is redirected to the DNS server having optimal performance connected with the link of which the current load pressure is minimum; and therefore, low response speed and response timeout caused by link congestion can be avoided, a situation that a DNS server cannot respond to DNS request messages due to failure can be avoided, and therefore, the normal access of services can be ensured, and user experience can be improved.
Description
Technical field
The present invention relates to computer networking technology, particularly relate to the reorientation method of a kind of DNS request message
And device.
Background technology
DNS (Domain Name System, domain name analysis system) server sets receiving client
During the DNS request message that preparation is sent, according to the solution that the resolved domain name lookup of DNS request message is corresponding
Analysis IP address (Internet Protocol Address, internet protocol address), and by this parsing IP address
Returning client device by DNS response message, it is right that client device is realized by this parsing IP address
The access of described resolved domain name, so, improve the dns server response speed to DNS request message
Degree become improve user surf the Net experience key.But, when link load pressure is relatively big or DNS service
During device fault, dns server all may be caused long to the response time of DNS request message, even
Cannot respond to DNS request message, and then cause client device cannot be normally carried out Operational Visit, and straight
Connect the online experience affecting user.
Summary of the invention
In view of this, the present invention provides reorientation method and the device of a kind of DNS request message, to solve
Because link load pressure is relatively big or dns server fault, and cause the response time of DNS request message
Problem that is long, that even cannot respond to.
Specifically, the present invention is achieved through the following technical solutions:
According to an aspect of the present invention, it is provided that the reorientation method of a kind of DNS request message, apply at net
On network equipment, described method includes:
After receiving DNS request message, determine the link that present load pressure is minimum；
The dns server of the best performance being connected to by the described link currently preserved is defined as target
Dns server；
By described DNS request message redirecting to described target dns server.
According to a further aspect in the invention, it is provided that the redirection device of a kind of DNS request message, apply
On the network equipment, described device includes:
First determines unit, for after receiving DNS request message, determines that present load pressure is minimum
Link；
Second determines unit, the DNS of the best performance for being connected to by the described link currently preserved
Server is defined as target dns server；
Redirect unit, be used for described DNS request message redirecting to described target dns server.
The application embodiment of the present invention, the network equipment may determine that and preserve that performance that each of the links is connected to is
Excellent dns server, after receiving the DNS request message that client device sends, determines current
The link that load pressure is minimum, described DNS request message redirecting to described present load pressure is minimum
The link dns server of best performance that is connected to, therefore, it is to avoid link blocks up the response caused
Speed is slow or response timeout, and also avoid dns server fault and can not respond DNS request report
The problem of literary composition, so that it is guaranteed that the normal access of business, improves Consumer's Experience.
Accompanying drawing explanation
Fig. 1 is a kind of application scenarios schematic diagram shown in the present invention one exemplary embodiment；
Fig. 2 is the reorientation method of a kind of DNS request message shown in the present invention one exemplary embodiment
Schematic flow sheet；
Fig. 3 is that a kind of redirection for DNS request message shown in the present invention one exemplary embodiment fills
The hardware structure diagram put；
Fig. 4 is the structure of the redirection device of the DNS request message shown in the present invention one exemplary embodiment
Block diagram.
Detailed description of the invention
Here will illustrate exemplary embodiment in detail, its example represents in the accompanying drawings.Following
When description relates to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represents same or analogous
Key element.Embodiment described in following exemplary embodiment does not represent the institute consistent with the present invention
There is embodiment.On the contrary, they only with as appended claims describes in detail, the one of the present invention
The example of the apparatus and method that a little aspects are consistent.
It is only merely for describing the purpose of specific embodiment in terminology used in the present invention, and is not intended to be limiting
The present invention." a kind of " of singulative used in the present invention and appended claims, " institute
State " and " being somebody's turn to do " be also intended to include most form, unless context clearly shows that other implications.Also should
Work as understanding, term "and/or" used herein refer to and comprise one or more be associated list item
Any or all possible combination of purpose.
Although should be appreciated that may use term first, second, third, etc. various to describe in the present invention
Information, but these information should not necessarily be limited by these terms.These terms only be used for by same type of information that
This distinguishes.Such as, without departing from the present invention, the first information can also be referred to as
Two information, similarly, the second information can also be referred to as the first information.Depend on linguistic context, as in this institute
Use word " if " can be construed to " and ... time " or " when ... time " or " response
In determining ".
Fig. 1 is a kind of application scenarios schematic diagram shown in the present invention one exemplary embodiment.As it is shown in figure 1,
Including client device, the network equipment and dns server 1 to dns server 4, client device
Accessing the Internet by the network equipment, the network equipment connects dns server 1 He by link A respectively
Dns server 2, and by link B connection dns server 3 and dns server 4, wherein,
The described network equipment is a kind of equipment for realizing load balancing, can be router, three-tier switch
Deng, this is not particularly limited by the present invention.
As shown in fig. 1, for each of the links, the network equipment can determine according to the default time cycle
And preserve the dns server of the best performance that each of the links is connected to, such as, response time is minimum
Dns server, and the network equipment can also gather the status data of each of the links, and according to described shape
State data determine the link that present load pressure is minimum, when the network equipment receives what client device sent
During DNS request message, by link minimum for DNS request message redirecting to this current load pressure even
The dns server of the best performance received, thus avoid link to block up and make the sound of DNS request message
Answer speed slower or overtime, also avoid dns server fault to make DNS request message cannot respond to
Problem, it is ensured that the normal access of business, improves Consumer's Experience.
Fig. 2 is the reorientation method of a kind of DNS request message shown in the present invention one exemplary embodiment
Schematic flow sheet.As in figure 2 it is shown, the reorientation method of a kind of DNS request message, apply at network
On equipment, described method comprises the steps:
Step S201, after receiving DNS request message, determines the link that present load pressure is minimum.
In the present embodiment, owing to the loading condition of link is real-time change, so the network equipment is permissible
After receiving the DNS request message that client device sends, determine the link that present load pressure is minimum.
Specifically, the network equipment, after receiving DNS request message, can obtain the status data of each of the links,
Wherein, during status data can include data on flows, concurrent connection number and bandwidth utilization rate one or
Multiple, and determine, according to the status data of each of the links, the link that present load pressure is minimum.With described shape
As a example by state data are data on flows, as shown in fig. 1, the network equipment obtains working as of link A and link B
Front data on flows, respectively FlowA=100M, FlowB=90M, is carried out described current traffic data
Load balancing computing, it is for instance possible to use weighting minimum discharge algorithm, it is further assumed that link A and link B
The weight of flow be 10, after being weighted minimum discharge algorithm, it may be determined that the load pressure of link B
Power is less.It should be noted that the algorithm of load balancing computing includes but not limited to that weighting minimum discharge calculates
Method, particularly relevant content may refer to prior art, repeats no more in the present embodiment.
Step S202, the dns server of the best performance being connected to by the described link currently preserved is true
It is set to target dns server.
Owing to the business load situation of dns server is real-time change, so what each of the links was connected to
The dns server of best performance is likely to constantly change.In an alternative embodiment of the present invention,
For each of the links, the network equipment can determine according to the default time cycle and preserve this link and is connected to
The dns server of best performance.Such as: the network equipment can be according to the default time cycle, logical
When crossing described link forwarding DNS request message to dns server, record forwarding time, and from institute
State link and receive the DNS response message that described dns server returns according to described DNS request message
Time, record the reception time, calculate further reception time and the difference of forwarding time, using this difference as
The response time of described dns server, and the DNS that the response time being connected to by described link is minimum
Server is defined as the dns server of the best performance that this link is connected to.It should be noted that for
Different links, the described default time cycle can be the same or different, such as: link A and chain
The time cycle preset of road B can be all T1, or, the time cycle preset of link A is T2,
The time cycle preset of link B is T3, and T2 ≠ T3.
Become apparent from for making the technology contents of step S202 describe, here, tie with the networking shown in Fig. 1
As a example by structure illustrative.As shown in fig. 1, as a example by link B, the network equipment arrives the
During one time cycle, when forwarding DNS request message by link B to dns server 3, note
Record forwarding time is t1, at the dns server 3 received from link B according to this DNS request message
During the DNS response message returned, the record reception time is t2, within this time cycle, is passing through chain
Road B is when dns server 4 forwards DNS request message, and record forwarding time is t3, and from chain
When road B receives the DNS response message that dns server 4 returns, the record reception time is t4, combines
Upper described, the response time that can be calculated dns server 3 is t2-t1, dns server 4
Response time is t4-t3, it is assumed that t2-t1 ＜ t4-t3, it is determined that dns server 3 is current time period
The dns server of the best performance that interior link B is connected to, the network equipment can preserve dns server
The IP address of 3 or other marks.Assume again that when arriving second time cycle, DNS is taken
Business device 3, the forwarding time of network equipment record is t5, and the reception time is t6, for dns server 4,
The forwarding time of network equipment record is t7, and the reception time is t8, is calculated dns server 3
Response time is t6-t5, and the response time of dns server 4 is t8-t7, it is assumed that t8-t7 ＜ t6-t5, then
Determine the DNS service of the best performance that dns server 4 is connected in current time period for link B
Device, the network equipment preserves IP address or other marks of dns server 4, to update link B even
The dns server of the best performance received.Equally, the DNS clothes of the best performance that link A is connected to
The determination of business device is consistent with link B with process with the implementation method of renewal, does not repeats them here.
In this step, the best performance that the described link currently preserved can be connected to by the network equipment
Dns server is defined as destination server.
Step S203, by DNS request message redirecting to described target dns server.
In this step, the network equipment can be by chain minimum for DNS request message redirecting to load pressure
The dns server of the best performance that road is connected to.As an example it is assumed that the network equipment is receiving DNS
During request message, the link of present load pressure minimum is link B, and the link B currently preserved connects
To the dns server of best performance be DSN server 4, then the network equipment is by this DNS request report
Literary composition is repositioned onto dns server 4.
The application embodiment of the present invention, the network equipment may determine that and preserve that performance that each of the links is connected to is
Excellent dns server, after receiving the DNS request message that client device sends, determines current
The link that load pressure is minimum, the chain minimum by described DNS request message redirecting to present load pressure
The dns server of the best performance that road is connected to, therefore, it is to avoid link blocks up the response speed that causes
Slow or response timeout, and also avoid dns server fault and DNS request message can not be responded
Problem, so that it is guaranteed that the normal access of business, improves Consumer's Experience.
Corresponding with the embodiment of the reorientation method of aforementioned DNS request message, present invention also offers
The embodiment of the redirection device of DNS request message.
The embodiment of the redirection device of DNS request message of the present invention can be applied on network devices.Dress
Put embodiment to be realized by software, it is also possible to realize by the way of hardware or software and hardware combining.
As a example by implemented in software, as the device on a logical meaning, it it is the place by its place network equipment
Computer program instructions corresponding in nonvolatile memory is read and runs formation in internal memory by reason device.
For hardware view, as it is shown on figure 3, be that the one shown in the present invention one exemplary embodiment is for DNS
One hardware structure diagram of the redirection device of request message, except the processor shown in Fig. 3, internal memory, net
Outside network interface and nonvolatile memory, the redirection device of DNS request message in embodiment
The network equipment at 400 places is generally according to the actual functional capability of this equipment, it is also possible to include other hardware, right
This repeats no more.
Fig. 4 is the structure of the redirection device of the DNS request message shown in the present invention one exemplary embodiment
Block diagram.As shown in Figure 4, the redirection device 400 of a kind of DNS request message, apply at the network equipment
On, described device includes: first determine unit 410, second determine unit 420 and redirect unit 430.
First determines that unit 410 for after receiving DNS request message, determines that present load pressure is
Little link.
According to a preferred embodiment of the invention, first determines that unit 410 can include that second determines subelement
411, second determines that subelement 411 may be used for the status data according to each of the links, determines present load
The link that pressure is minimum, wherein, status data can include that data on flows, concurrent connection number and bandwidth make
With one or more in rate.
Second DNS determining the unit 420 best performance for being connected to by the described link currently preserved
Server is defined as target dns server.Wherein, the dns server of described best performance can be
The dns server that the response time of DNS response message is minimum.
Redirect unit 430 to be used for DNS request message redirecting to described target dns server.
According to an alternative embodiment of the invention, the redirection device 400 of described DNS request message is all right
Determine unit 440 including the 3rd, the 3rd determine unit 440 for for each of the links, according to presetting
Time cycle determine and preserve the dns server of best performance that link is connected to.
Preferably, the 3rd determines that unit 440 can also include first record subelement the 441, second record
Subelement 442, computation subunit 443 and first determine subelement 444, wherein, the first record subelement
441 for for each of the links, forwarding DNS request message to dns server by described link
Time, recording forwarding time, the second record subelement 442 is for for each of the links, from described link
When receiving the DNS response message that described dns server returns according to described DNS request message, note
The record reception time, during forwarding based on the first record subelement 441 and the second record subelement 442 record
Between and receive the time, computation subunit 443 can calculate the difference of described reception time and described forwarding time
Value, using described difference as the response time of described dns server, first determine subelement 444 for
The dns server of the described response time minimum being connected to by described link is defined as described link and connects
The dns server of the best performance arrived.
In said apparatus, the function of unit and the process that realizes of effect specifically refer in said method corresponding
Step realize process, do not repeat them here.
For device embodiment, owing to it corresponds essentially to embodiment of the method, so relevant part ginseng
See that the part of embodiment of the method illustrates.Device embodiment described above is only schematically,
The wherein said unit illustrated as separating component can be or may not be physically separate, makees
The parts shown for unit can be or may not be physical location, i.e. may be located at a place,
Or can also be distributed on multiple NE.Can select according to the actual needs part therein or
The whole module of person realizes the purpose of the present invention program.Those of ordinary skill in the art are not paying creativeness
In the case of work, i.e. it is appreciated that and implements.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Within the spirit of invention and principle, any modification, equivalent substitution and improvement etc. done, should be included in
Within the scope of protection of the invention.
Claims (10)
1. a reorientation method for DNS request message, application is on network devices, it is characterised in that
Described method includes:
After receiving DNS request message, determine the link that present load pressure is minimum；
The dns server of the best performance being connected to by the described link currently preserved is defined as target
Dns server；
By described DNS request message redirecting to described target dns server.
Method the most according to claim 1, it is characterised in that described method also includes:
For each of the links, determine and preserve the performance that described link is connected to according to the default time cycle
Optimum dns server.
Method the most according to claim 2, it is characterised in that described determine that described link is connected to
The dns server of best performance include:
When forwarding DNS request message to dns server by described link, record forwarding time；
Receiving what described dns server returned according to described DNS request message from described link
During DNS response message, record the reception time；
Calculate the difference of described reception time and described forwarding time, using described difference as described DNS
The response time of server；
The dns server of the response time minimum being connected to by described link is defined as described link and connects
The dns server of the best performance arrived.
Method the most according to claim 1, it is characterised in that described determine that present load pressure is
Little link includes:
According to the status data of each of the links, determine the link that present load pressure is minimum.
Method the most according to claim 4, it is characterised in that described status data includes flow number
According to one or more in, concurrent connection number and bandwidth utilization rate.
6. a redirection device for DNS request message, application is on network devices, it is characterised in that
Described device includes:
First determines unit, for after receiving DNS request message, determines that present load pressure is minimum
Link；
Second determines unit, the DNS of the best performance for being connected to by the described link currently preserved
Server is defined as target dns server；
Redirect unit, be used for described DNS request message redirecting to described target dns server.
Device the most according to claim 6, it is characterised in that described device also includes:
3rd determines unit, for for each of the links, determines according to the default time cycle and preserves institute
State the dns server of the best performance that link is connected to.
Device the most according to claim 7, it is characterised in that the described 3rd determines that unit includes:
First record subelement, for for each of the links, forwarding DNS request report by described link
When dns server given in literary composition, record forwarding time；
Second record subelement, for for each of the links, is receiving described DNS from described link
During the DNS response message that server returns according to described DNS request message, record the reception time；
Computation subunit, for calculating the difference of described reception time and described forwarding time, by described difference
It is worth the response time as described dns server；
First determines subelement, the dns server of the response time minimum for being connected to by described link
It is defined as the dns server of the best performance that described link is connected to.
Device the most according to claim 6, it is characterised in that described first determines that unit includes:
Second determines subelement, for according to the status data of each of the links, determines that present load pressure is
Little link.
Device the most according to claim 9, it is characterised in that described status data includes flow
One or more in data, concurrent connection number and bandwidth utilization rate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510216658.0A CN105991347A (en) | 2015-04-30 | 2015-04-30 | Redirection method of DNS request message and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510216658.0A CN105991347A (en) | 2015-04-30 | 2015-04-30 | Redirection method of DNS request message and device |
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| CN201510216658.0A Pending CN105991347A (en) | 2015-04-30 | 2015-04-30 | Redirection method of DNS request message and device |
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| CN115118700A (en) * | 2022-06-27 | 2022-09-27 | 北京天融信网络安全技术有限公司 | Communication method and communication system |
| CN115118700B (en) * | 2022-06-27 | 2024-03-15 | 北京天融信网络安全技术有限公司 | Communication method and communication system |
| CN115361268A (en) * | 2022-08-19 | 2022-11-18 | 湖北天融信网络安全技术有限公司 | Redirection method, redirection device, electronic equipment and computer-readable storage medium |
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Address after: Binjiang District and Hangzhou city in Zhejiang Province Road 310051 No. 68 in the 6 storey building Applicant after: Hangzhou Dipu Polytron Technologies Inc Address before: Binjiang District and Hangzhou city in Zhejiang Province Road 310051 No. 68 in the 6 storey building Applicant before: Hangzhou Dipu Technology Co., Ltd. |
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