CN107613037A - A kind of domain name reorientation method and system - Google Patents
A kind of domain name reorientation method and system Download PDFInfo
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- CN107613037A CN107613037A CN201710828089.4A CN201710828089A CN107613037A CN 107613037 A CN107613037 A CN 107613037A CN 201710828089 A CN201710828089 A CN 201710828089A CN 107613037 A CN107613037 A CN 107613037A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
Abstract
The invention discloses a kind of domain name reorientation method and system, the described method comprises the following steps：S10：Obtain internet protocol address；S20：The packet in link layer is parsed, and intercepts designated domain name request；S30：The designated domain name is redirected to ask to the internet protocol address.The invention enables user need to only remember domain name, and by domain name with regard to that can directly access network, method is more friendly；The other present invention expands the interception scope of DNS request packet, can be to carrying out same interception and redirection without the DNS request of IP layers, it ensure that the integrality of data, the comprehensive of equipment control is ensured, for service provider, some network equipments that can not be managed by accessing fixed ip address mode, it can be managed by way of the above method is realized and accesses fixed DNS so that the more convenient more specification of network management.
Description
Technical field
The present invention relates to internet arena, more particularly to a kind of domain name reorientation method and system.
Background technology
DNS (Domain Name System, domain name system), it is into corresponding IP address access domain name address conversion
A kind of system of (Internet Protocol Address, also known as Internet protocol address, internet protocol address), it because
The special online distributed data base mutually mapped as domain name and IP address, there is provided the conversion of domain name to IP address, can
User is set more easily to access internet, remember can be by the IP number strings that machine is directly read without spending, and generally we input
Network address be exactly a domain name.By host name, the process for finally giving IP address corresponding to the host name is called domain name mapping
(or hostname resolution), DNS are exactly the special system for completing domain name mapping.DNS Protocol is operated on udp protocol, uses end
Slogan 53.
At present, DNS request is carried out in domain name resolution process, majority of network equipment is for a variety of purposes, such as in order to realize
The management of certain domain name provides data support etc. for project development and interior survey, is required to be reset specific DNS request
To operation.DNS is redirected is used for the selection for promoting the caching server based on dns resolution mechanism in the internet.Various CDN are public
These technologies are widely used in department.
Patent document such as Publication No. CN102014173B disclose " a kind of domain name redirecting control method, module and
System ", method are pointed out that domain name redirects control module and receives dns server in response user's domain name request, asked from user
The middle domain-name information for obtaining and sending；Whether can be used for according to the domain-name information that the redirection domain-name information of preservation determines to receive
Redirect, if it is determined that the domain name of user request can be used for redirecting, then the domain name accessed user is redirected to pair
The IP address answered.The redirection domain-name information, which is stored in, to be redirected in domain name list, is recorded not in the redirection domain name list
Domain name available for redirection.But only point out to obtain in dns server response user's domain name request in method and send domain name,
Do not point out to be intercepted at which place, the position difference of interception can directly influence the success or not of interception, in addition for
The acquisition process of corresponding IP address, the method for not proposing more to meet practice.
And for example Publication No. CN101505323B patent document discloses the " domain name based on content analysis under mass data
Parse reorientation method ", method includes the method for obtaining domain name, the judgement of correct domain name error field name and point of wrong domain name
Analyse processing method.It is not direct return blank page when user's input error domain name, but to the domain name content of user's input
Analyzed, according to domain name content, return to the information that user needs most, avoid user from opening the helpless of blank page, can be more
Add intelligent for offering customers service.
On specific DNS request reorientation method, in general implementation substantially has the following two kinds after conclusion：First, pass through
In application layer, modification/etc/hosts files, by adding binary combination of the domain name with IP address wherein, to carry out domain name misfortune
Hold；Addition form following 192.168.1.103www.sohu.com, wherein 192.168.1.103 are home server IP,
Www.sohu.com is the domain name to be kidnapped.Second, by the IP layers in network protocol stack, DNS data bag is intercepted, and
Again organize a DNS return bag and be sent to specified IP address.For better simply application, by application layer/etc/hosts texts
Part adds domain name and can be achieved simply to be directed to some or some domain names with the binary combination of IP address, is redirected to the IP's that specifies
Function；But it for relatively complicated application demand, can all select that DNS request bag is intercepted in IP layers substantially
Realize.
But after some network equipment receives the DNS request that client is sent on the market, it can't actively send DNS
The IP layers of network equipment network protocol stack are gone in request, also can not be accomplished to without IP layers using both the above implementation
DNS request packet intercepted so that there is blind area in the management of the network equipment.
It can be seen that, it is desirable to solution is provided and avoids above mentioned problem and defect very necessary.
The content of the invention
The technical problem to be solved in the present invention is to be directed to above-mentioned the deficiencies in the prior art, there is provided one kind can be to without IP
Layer but only the DNS request bag in link layer migration intercepted and be redirected to corresponding IP address domain name reorientation method and
System.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of domain name reorientation method, the described method comprises the following steps：
S10：Obtain internet protocol address；
S20：The packet in link layer is parsed, and intercepts designated domain name request；
S30：The designated domain name is redirected to ask to the internet protocol address.
Further, the step S20 includes：
S21：The packet in link layer is parsed, judges whether the packet is domain name message data bag；
S22：If domain name message data bag, then continue to parse domain name message data bag acquisition domain name；
S23：Judge whether domain name is designated domain name, if then performing step S30.
Further, the step S30 includes：
S31：Construct domain name and return to bag, and domain name return bag is redirected to the internet protocol address.
Further, the step S10 includes：
S11：Internet protocol address is obtained from corresponding server according to DHCP.
Further, include between the step S10 and the step S20：Judge whether internet protocol address obtains into
Work(, if success, step S20 is performed, if unsuccessful, does not perform step S20.
Further, the step S20 includes：Hook Function is established, all link layer data bags are linked up with to institute
State at Hook Function.
Further, the Hook Function performs step and included：
S21：Packet is parsed, judges whether the packet is domain name message data bag；
S22：If domain name message data bag, then continue to parse domain name message data bag acquisition domain name；
S23：Judge whether domain name is designated domain name, if then performing step S30.
A kind of domain name Redirectional system, the system include：
Internet protocol address module, for obtaining internet protocol address；
Blocking module is parsed, for parsing the packet in link layer, and intercepts designated domain name request；
Redirection module, asked for redirecting the designated domain name to the internet protocol address.
Further, the parsing blocking module includes：
First judging unit, after parsing the packet in link layer, judge whether the packet is domain name message
Packet；
Acquiring unit, if judging it is domain name message data bag for the first judging unit, continuing to parse domain name
Domain name is obtained during message data bag；
Second judging unit, for judging whether the domain name that acquiring unit obtains is designated domain name.
Further, the redirection module includes：
Structural unit, bag is returned to for constructing domain name.
After adopting the above technical scheme, the beneficial effects of the invention are as follows：
(1) because internet protocol address is by server dynamically distributes mostly, there is uncertainty, by elder generation in equipment
Behind the middle corresponding internet protocol address of acquisition, then parse the domain name request for intercepting and specifying so that the process of parsing is not done as far as possible
Idle work, do not waste Internet resources；
(2) by parsing the packet in link layer, and designated domain name request is intercepted so that all DNS requests include
It can be intercepted without the DNS request of IP layers, so that more clients obtain being more convenient the online experience of smoothness, simultaneously
Also it is convenient by the way that domain name is more preferable, the wider array of management network server device of scope provides for service provider；
(3) by first judging whether the link layer data bag is domain name message data bag, then domain name is obtained, rather than first
The critical field for obtaining domain name kind after the critical field in the link layer data bag again is obtained, facilitates domain name accurately to obtain same
When can also reduce link layer data Packet analyzing task total amount；
(4) by establishing Hook Function, all link layer data bags are linked up with to the Hook Function, can be simple
All link layer data bags are rapidly obtained, and all DNS requests can be handled according to unified parsing hold-up interception method, are nothing
All designated domain names of redirection of careless mistake provide condition.
Generally above-mentioned implementation, for by remembeing domain name by the way of can directly access network to user
It is easier to remember more friendly；It is same for service provider, some nets that can not be managed by accessing fixed ip address mode
Network equipment, after can using such scheme by setting designated domain name, by the way of fixed domain name can manage network sets
It is standby；Other above-mentioned technical proposal expands the interception scope of DNS request packet, can be to the DNS request progress without IP layers
Same interception and redirection, the integrality of data is ensure that, ensured the comprehensive of equipment control.
Brief description of the drawings
In order to illustrate the embodiments of the present invention more clearly or prior art technical scheme, accompanying drawing is as follows：
Fig. 1 is a kind of domain name reorientation method flow chart that the embodiment of the present invention 1 provides；
Fig. 2 is a kind of domain name reorientation method flow chart that the embodiment of the present invention 2 provides；
Fig. 3 is a kind of domain name reorientation method flow chart that the embodiment of the present invention 3 provides；
Fig. 4 is a kind of domain name Redirectional system structure chart that the embodiment of the present invention 4 provides.
Embodiment
It is the specific embodiment of the present invention and with reference to accompanying drawing below, technical scheme is further described,
But the present invention is not limited to these embodiments.
Today of wireless network high speed development, we can experience WLAN whenever and wherever possible, and (namely we often say
WIFI network) brought to our life it is efficient and convenient.In recent years, WIFI equipment emerged in an endless stream, and WIFI equipment establishes net
Network connection mode it is also varied, the different WIFI equipments under different connected modes, due to it is different needs perform it is respective
Function.
DNS (Domain Name System, domain name system) is exactly a kind of mode for establishing network connection therein, DNS
Ask in implementation procedure, in order to realize the management of certain domain name or provide data support etc. for project development and interior survey, be required to
Specific DNS request is redirected into operation.And existing most redirect in operation is all in some of IP layers
Side intercepts DNS request, and the request data package without IP layers can not be intercepted, and can not meet using the fixed domain name of access
Mode manage the demands of some network equipments.It is therefore desirable to the somewhere carry out data package capture in link layer.
The present invention is to solve the above problems, propose that a kind of scheme conveniently can pass through nothing by domain name access with some are managed
The network equipments such as repeater (Repeater) or WIFI expanders that line bridge joint is connected with active router, it can also be set accessing these
When the DNS request that standby user terminal is sent does not go to the IP layers of these equipment actively, in advance in the somewhere progress of link layer
DNS request intercepts, and is redirected on these device IP.
This programme realizes hook structures, DNS request in link layer intercepted by establishing a kernel module, and
Construction is corresponding to return to bag, and DNS request is redirected on device IP.Wherein, when kernel module starts, and how about redirection fits
When execution be all this programme design when need consider the problem of.
Embodiment 1
As shown in figure 1, the present embodiment provides a kind of domain name reorientation method, the described method comprises the following steps：
S10：Obtain internet protocol address (IP address)；
In this step, router or Repeater etc. find the IP address used in this equipment connection network first, and
Preserve this lower IP address information field, such as 192.168.18.25.Then triggering starts next step, starts the number of link layer
According to Packet analyzing.Because existing IP address is most it is the dynamic IP of server-assignment, rather than fixes IP, so in this step first
IP address is obtained, restarts the process data packet in parsing link layer, unnecessary data parsing can be reduced, save network money
Source, purify network connection procedure.
S20：The packet in link layer is parsed, and intercepts designated domain name (DNS) request；
In this step, after router or Repeater etc. obtain IP address, the data in link layer are opened in actively triggering
The resolving of bag, all packets in link layer are parsed one by one, and intercept the DNS request that lower service provider specifies, intercepted
Finish execution next step, such as specify DNS request be set to e.to, will be found in this step this DNS request of e.to and by its
Intercept standby；So that all DNS requests include to be intercepted without the DNS request of IP layers, so that more
Client obtains being more convenient access or the online experience of smoothness, while is also service provider by the way that domain name is more preferable, scope is wider array of
Management router or Repeater these network equipments offers are convenient；
S30：The designated domain name (DNS) request is redirected to the internet protocol address (IP address).
, please by this DNS after router or Repeater etc. intercept the DNS request that service provider specifies in this step
Seek the IP address for being redirected to and obtaining before, i.e. after priority obtains 192.168.18.25 and e.to, this is specified by e.to
DNS request is redirected at 192.168.18.25 this IP address.So, be achieved that by DNS access routers or
Repeater etc. function, facilitate user's memory and smoothly establish network connection, while it is solid using accessing to be also convenient for service provider
Determine the network equipments such as DNS mode management router or Repeater.
The present embodiment provide domain name reorientation method realize by DNS access and manage it is some actively by DNS please
The network equipment for being sent to itself IP layer is sought, these network equipments may be WIFI expanders, Repeater etc..
Embodiment 2
As shown in Fig. 2 the present embodiment and the difference of embodiment before are, the present embodiment provides a kind of more detailed domain
Name reorientation method, is specifically included in the step S20：
S21：The packet in link layer is parsed, judges whether the packet is DNS message data bags；
In this step, router or Repeater etc. parse received in link layer first one by one after IP address is obtained
All packets arrived, DNS message data bags are found out, determining whether the method generally use monitored data bag of DNS messages is
No No. 53 ports from UPD agreements.
S22：If DNS message data bags, then continue to parse the DNS message datas bag acquisition DNS；
In this step, if it is determined that No. 53 ports of the packet actually from UPD agreements, then continue to parse this
Message data bag, obtain the DNS in message.
S23：Judge whether the DNS is to specify DNS, if then performing step S30.
In this step, will get DNS matches with the DNS that service provider sets, for example, it is assumed that service provider specify DNS be
E.to, then whether the DNS for judging the acquisition is e.to, if it is judged that being yes, then the meeting such as router or Repeater
E.to this DNS request is redirected to the IP address got before, finally realized by the i.e. addressable functions of DNS.
In summary, by first judging whether the packet is DNS message data bags, DNS is obtained afterwards, finally confirmation is
The no parsing interception order for specified DNS, link layer data Packet analyzing task total amount can be reduced, facilitates equipment accurately to obtain
DNS, complete DNS and access.
Alternatively, the step S30 includes：
S31：Construct DNS and return to bag, and DNS return bags are redirected to the IP address.
In this step, the DNS request that the equipment such as router or Repeater confirms to be sent by user terminal is really referred to
Fixed, its own accreditation e.to, the message number for one e.to of message coding type structure that will be can recognize that according to this equipment
According to bag (claiming DNS to return to bag), such as e.to is www.baidu.com, the message coding type structure that it can recognize that according to this equipment
It is 3www5baidu3com after making, after DNS returns to bag construction complete, this DNS return bags is redirected to the IP address, institute
It is exactly the IP address got before the packet in equipment parsing link layer to state IP address.
Alternatively, the step S10 includes：
S11：IP address is obtained from corresponding server according to DHCP protocol.
Repeater kind equipments can typically connect active router by way of wireless bridging, when Repeater passes through WIFI
After bridging active router success, Repeater just and active router and with network, the IP address of active router be one dynamically
IP address, with the arrival in lease time limit, IP address there may be change, have uncertainty, with preserving unique constant IP
The mode of location, it is clear that requirements for access can not be met.In this step, obtain IP address mode and utilize udhcpc processes, udhcpc enters
Journey gets IP address by DHCP protocol from the Dynamic Host Configuration Protocol server of active router, and obtaining IP address using the above method meets
IP address distribution principle, the IP address of acquisition more meet actual, more accurate.
It is important to note that include between the step S10 and the step S20：Judge whether IP address obtains
Success, if success, step S20 is performed, if unsuccessful, does not perform step S20.That is IP address process is only obtained
An IP address for meeting requirements for access is successfully got, can just start the packet in parsing link layer, and intercept and specify DNS
Request process.Reduce unnecessary parsing and intercept process, purify network, economize on resources.
The domain name reorientation method that the present embodiment provides is helped using the more intelligent completion DNS of the network equipment of this method
Access process, also more accurately ensure that DNS is accessed.
Embodiment 3
As shown in figure 3, the present embodiment and the difference of embodiment 2 are, the present embodiment provides a kind of in linux kernel realization
Domain name redirects method detailed, and and if only if by taking Repeater as an example, in the present embodiment, and Repeater gets current network company
After IP address under connecing, Repeater intercepts process by Insmod tool loads DNS, that is, opens step S20 and S30
Corresponding process, realize that DNS is redirected.
During programming, step S20 and the S30 corresponding process mentioned are write into same dns_redirect.ko
Kernel module, after the IP address (redirect_ip) under Repeater gets current network connection that and if only if, pass through
Dns_redirect.ko kernel modules are loaded into Linux kernel by Insmod instruments, and final realize specifies resetting for DNS
To.Understandable, DNS and redirect_ip are exactly two parameters when loading dns_redirect.ko kernel modules.
Specifically, the step S20 includes：
Hook Function is established, all link layer data bags are linked up with to the Hook Function.
Hook Function is the program segment of a processing message, is called by system, it is linked into system.Disappear whenever specifically
Breath is sent, and before no arrival purpose window, hook program just first captures the message, that is, Hook Function first obtains control,
Condition is provided for working process message below.In this step, Hook Function is established, all link layer data bags can be linked into together
In the program segment of one processing message, identical processing procedure is performed, completion DNS interceptions that can be without careless mistake and redirection,
So as to set up the bridge that method is realized to specific procedure.
Specifically, the Hook Function performs step and included：
S21：Packet is parsed, judges whether the packet is DNS message data bags；
S22：If DNS message data bags, then continue to parse the DNS message datas bag acquisition DNS；
S23：Judge whether the DNS is to specify DNS, if then performing step S30.
Hook Function execution step herein is identical with step S20 specific implementations process in embodiment 2, and just no longer this is superfluous
State.
It is defined as follows in addition, subprogram is realized：
Wherein, general idea is exactly to realize a packet_type inner core first, to the data that type is ETH_P_ALL
Bag is parsed, and performs this Hook Function of ip_skb_recv.
It is by a dev_add_pack function that all_packet_type is real during Insmod dns_redirect.ko
Example hook into packet must through path on.This Hook Function of so ip_skb_recv, which is established, to be completed, all link numbers of plies
All hook process can be realized according to bag by ip_skb_recv functions.
Practicable programming is present embodiments provided, all link layer data bags are linked up with to the hook letter
Number place, can be simple and quick get all link layer data bags, and can own according to unified parsing hold-up interception method processing
DNS request, provide condition for all specified DNS of the redirection without careless mistake.On the whole, user and service provider are only by domain name
It may have access to and manage some network equipments that DNS request is not sent to actively itself IP layer.
Embodiment 4
As shown in figure 4, the present embodiment provides a kind of domain name Redirectional system, the system includes：
IP address module 100, for obtaining IP address；
Blocking module 200 is parsed, for parsing the packet in link layer, and intercepts and specifies DNS request；
Redirection module 300, for redirecting the specified DNS request to the IP address.
Further, the parsing blocking module 200 includes：
First judging unit 210, after parsing the packet in link layer, judge whether the packet is DNS reports
Literary packet；
Acquiring unit 220, if judging it is DNS message data bags for the first judging unit 210, continuing described in parsing
DNS is obtained during DNS message data bags；
Second judging unit 230, for judging whether the DNS that acquiring unit 220 obtains is to specify DNS.
Further, the redirection module 300 includes：
Structural unit 310, bag is returned to for constructing DNS.
By taking router as an example, System Working Principle is as follows：The IP address module 100 of router obtains from Dynamic Host Configuration Protocol server
It is standby to dynamic IP addressing, such as 192.168.15.28.Then the parsing blocking module 200 of router parses the number in link layer
According to bag, the first central judging unit 210 judges whether the packet is DNS message data bags, is tied if being not to be if result
Shu Jincheng, start if being to be if result and acquisition DNS is intercepted when acquiring unit 220 is continuing to parse the DNS message datas bag；The
Two judging units 230 judge whether the DNS that acquiring unit 220 obtains is to specify DNS, such as e.to.If not then terminate into
Journey, if then the startup of structural unit 310 starts to construct e.to return bags, construction finishes the weight of redirection module 300 by router
Orient the e.to and return to bag to the IP address 192.168.15.28.
The domain name Redirectional system that this implementation provides expands the interception scope of DNS request packet, can to some without
The DNS request for crossing IP layers carries out same interception and redirection, ensure that the integrality of data, has ensured the comprehensive of equipment control
Property.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (10)
1. a kind of domain name reorientation method, it is characterised in that the described method comprises the following steps：
S10：Obtain internet protocol address；
S20：The packet in link layer is parsed, and intercepts designated domain name request；
S30：The designated domain name is redirected to ask to the internet protocol address.
2. a kind of domain name reorientation method according to claim 1, it is characterised in that the step S20 includes：
S21：The packet in link layer is parsed, judges whether the packet is domain name message data bag；
S22：If domain name message data bag, then continue to parse domain name message data bag acquisition domain name；
S23：Judge whether domain name is designated domain name, if then performing step S30.
3. a kind of domain name reorientation method according to claim 1 or 2, it is characterised in that the step S30 includes：
S31：Construct domain name and return to bag, and domain name return bag is redirected to the internet protocol address.
4. a kind of domain name reorientation method according to claim 1, it is characterised in that the step S10 includes：
S11：Internet protocol address is obtained from corresponding server according to DHCP.
5. a kind of domain name reorientation method according to claim 1, it is characterised in that the step S10 and the step
Include between S20：Judge whether internet protocol address obtains success, if success, perform step S20, if unsuccessful, do not hold
Row step S20.
6. a kind of domain name reorientation method according to claim 1, it is characterised in that the step S20 includes：Establish
Hook Function, all link layer data bags are linked up with to the Hook Function.
7. a kind of domain name reorientation method according to claim 6, it is characterised in that the Hook Function performs step bag
Include：
S21：Packet is parsed, judges whether the packet is domain name message data bag；
S22：If domain name message data bag, then continue to parse domain name message data bag acquisition domain name；
S23：Judge whether domain name is designated domain name, if then performing step S30.
8. a kind of domain name Redirectional system, it is characterised in that the system includes：
Internet protocol address module, for obtaining internet protocol address；
Blocking module is parsed, for parsing the packet in link layer, and intercepts designated domain name request；
Redirection module, asked for redirecting the designated domain name to the internet protocol address.
9. a kind of domain name Redirectional system according to claim 8, it is characterised in that the parsing blocking module includes：
First judging unit, after parsing the packet in link layer, judge whether the packet is domain name message data
Bag；
Acquiring unit, if judging it is domain name message data bag for the first judging unit, continuing to parse domain name message
Domain name is obtained during packet；
Second judging unit, for judging whether the domain name that acquiring unit obtains is designated domain name.
10. a kind of domain name Redirectional system according to claim 8, it is characterised in that the redirection module includes：
Structural unit, bag is returned to for constructing domain name.
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| CN201710828089.4A CN107613037B (en) | 2017-09-14 | 2017-09-14 | Domain name redirection method and system |
| PCT/CN2017/116429 WO2019052058A1 (en) | 2017-09-14 | 2017-12-15 | Domain name redirecting method and system |
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| CN201710828089.4A CN107613037B (en) | 2017-09-14 | 2017-09-14 | Domain name redirection method and system |
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| CN109981347A (en) * | 2019-02-22 | 2019-07-05 | 深圳市吉祥腾达科技有限公司 | A kind of method of automatic spring bridge administration page |
| CN110557753A (en) * | 2019-08-13 | 2019-12-10 | 成都电科慧安科技有限公司 | DNS redirection method based on relay access |
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| CN112202675A (en) * | 2020-10-10 | 2021-01-08 | 四川天邑康和通信股份有限公司 | Method for realizing access to router by using domain name based on Linux kernel DNS |
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| CN110933129A (en) * | 2019-10-18 | 2020-03-27 | 网宿科技股份有限公司 | Data scheduling method, plug-in, device and scheduling server |
| CN112202675A (en) * | 2020-10-10 | 2021-01-08 | 四川天邑康和通信股份有限公司 | Method for realizing access to router by using domain name based on Linux kernel DNS |
| CN112202675B (en) * | 2020-10-10 | 2022-04-15 | 四川天邑康和通信股份有限公司 | Method for realizing access to router by using domain name based on Linux kernel DNS |
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| WO2019052058A1 (en) | 2019-03-21 |
| CN107613037B (en) | 2021-11-12 |
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