CN103209129B - A kind of realize device network interface exempt from change method and apparatus - Google Patents
A kind of realize device network interface exempt from change method and apparatus Download PDFInfo
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- CN103209129B CN103209129B CN201310092460.7A CN201310092460A CN103209129B CN 103209129 B CN103209129 B CN 103209129B CN 201310092460 A CN201310092460 A CN 201310092460A CN 103209129 B CN103209129 B CN 103209129B
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Abstract
The invention provides a kind of realize device network interface exempt from change method and apparatus, described method includes: by router interface open exempt from configuration change function；Judge the configuration mode of the second line of a couplet device network interface being in same broadcast domain with described interface；If manual mode, carry out ARP trust authentication；If by ARP trust authentication, the physical address of second line of a couplet equipment is recorded in the list item of router with IP address；Second line of a couplet equipment sending data；Record router receives the incoming interface information of data；Forward data；Find outgoing interface；Find the physical address that the reference address of data is corresponding, send data.The present invention is by combining the method for Dynamic Host Configuration Protocol server, network agent and state table on the router, the PC network configuration of the newest couple in router is automatic obtaining mode, or manual specified interface network parameter, can accomplish to revise its current network interface configuration, it is possible to carry out data forwarding by router.
Description
Technical field
The present invention relates to network and network equipment field, particularly relate to one realize device network interface exempt from change
Method and apparatus.
Background technology
Broadband router is the most emerging a kind of networking products, it along with broadband universal meeting the tendency and
Raw.Broadband router is integrated with the functions such as router, fire wall, bandwidth control and system administration, possesses fast
The features such as speed data forwarding, network management flexibly, abundant traffic statistics and journaling, and configure
Simply, majority also has configuration wizard function, it is simple to user manages use.For China's broadband market at present,
Most broadband routers have special optimization to design, the most ISP (Internet Service Provider,
ISP) featured function such as circuit automatic routing, different network traffics environment can be met.Many
The number broadband router highly integrated design of employing, integrated 10/100/1000Mbps broadband ethernet interface, permissible
Driving plurality PC interconnection and connection Internet, be widely used in family, hotel, school, office, net
, community access, government, the occasion such as enterprise.
In order to make second line of a couplet PC have access to network, general broadband router LAN (Local Area Network,
LAN) it is all to enable DHCP (dynamically obtaining IP) server capability on mouth, make Intranet PC automatically obtain IP,
Thus connect into network, carry out data forwarding by router.Meet the demand being typically relatively fixed user,
But in flows of personnel such as similar hotels than in scene faster, user's IT knowledge number is different, accessing wine
During the network of shop, the support needing manager is more, increases the maintenance workload of management.
At present, make the PC in the same broadcast domain of router interface, exempt from network configuration change and still belong to the most to be solved
Technical problem.
Summary of the invention
The present invention propose a kind of realize device network interface exempt from change method and apparatus, it is achieved that the newest
The PC network configuration of couple in router is automatic obtaining mode, or manual specified interface network parameter, can
Enough accomplishing need not revise its current network interface configuration, i.e. can carry out data forwarding by router, greatly
Width decreases the maintenance work of manager, and described technical scheme is as follows:
A kind of realize device network interface exempt from change method, including:
Any interface of router is opened second line of a couplet device network interface and exempts from configuration change function；
Judgement and described router interface are in the configuration side of the second line of a couplet device network interface within same broadcast domain
Whether formula is manual designated mode；
If it is, start ARP (Address Resolution Protocol, address resolution protocol) agency,
Carry out ARP trust authentication；
Judge whether by ARP trust authentication；
If it is, by note corresponding with the IP address of described second line of a couplet equipment for the physical address of described second line of a couplet equipment
Record is in the corresponding list item of router；
Second line of a couplet equipment sends datagram to router；
Five-tuple according to the described second line of a couplet equipment sent datagram sets up data stream list, at described data stream
Table records the information that router receives the incoming interface of described data message；
Described data message is forwarded；
When the response bag of described data message arrives router, find outgoing interface according to described data stream list；
The IP address of the physical address of second line of a couplet equipment and described second line of a couplet equipment in list item according to described router
Record, finds the physical address that the reference address of described data message is corresponding, sends data.
Further, described method also includes timing aging record static state in the corresponding list item of described router
IP address-physical address correspondence entry.
Further, if the configuration mode of second line of a couplet device network interface is not manual designated mode, then it route
Device is assisted according to DHCP (Dynamic Host Configuration Protocol, DynamicHost arranges agreement)
View, to described second line of a couplet equipment distributed network parameters, carries out data forwarding.
Further, second line of a couplet equipment includes DNS (Domain Name to the data message that router sends
System, domain name system) data message.
Further, described DNS data message is carried out forwarding to include:
Second line of a couplet equipment sends DNS request bag to router；
Judge whether the purpose IP address in DNS request bag is included in the dns server of router the machine configuration
In address list；
If it is, described DNS data message is directly forwarded；
If it is not, then described DNS data message is carried out DNS proxy forwarding.
Further, the most aging record static ip address in the corresponding list item of described router-physically
Location correspondence entry farther includes:
After creating static ip address-physical address correspondence entry, flag bit Flag, Flag are set for described entry
Initial value is set to 1；
Enable intervalometer；
After described intervalometer triggers, travel through the static ip address-physical address correspondence bar of all band Flag labellings
Mesh；
Whether the value judging Flag is 1；
If the value of Flag is 1, the most described Flag sets to 0；
If the value of Flag is 0, then delete described static ip address-physical address correspondence entry；
Judge whether it is the last item static ip address-physical address correspondence entry；
If it is, replacement intervalometer.
A kind of device network interface that realizes exempts from the device of change, including:
Function opening module, changes for any interface of router unlatching second line of a couplet device network interface is exempted from configuration
Dynamic function；
First judge module, for judging that the second line of a couplet being within same broadcast domain with described router interface sets
Whether the configuration mode of standby network interface is manual designated mode；
ARP trust authentication module, is manual designated mode for the configuration mode at second line of a couplet device network interface
Time, start ARP proxy, carry out ARP trust authentication；
Second judge module, is used for judging whether by ARP trust authentication；
Entry creation module, for after by ARP trust authentication, by the physical address of described second line of a couplet equipment
The record corresponding with the IP address of described second line of a couplet equipment is in the corresponding list item of router；
Request sending module, is used for sending datagram；
Data stream list creation module, the five-tuple of the second line of a couplet equipment for sending datagram described in basis is set up
Data stream list, records the information that router receives the incoming interface of described data message in described data stream list；
Data forwarding module, for forwarding described data message；
Search module, for when the response bag of described data message arrives router, according to described data stream
Table finds outgoing interface information；
Data transmission blocks, is used for according to the physical address of second line of a couplet equipment in the list item of described router with described
The record of the IP address of second line of a couplet equipment, finds the physical address that the reference address of described data message is corresponding, sends out
Send data.
Further, described device also includes timing ageing module, for the aging record of timing in described route
Static ip address in the corresponding list item of device-physical address correspondence entry.
Further, second line of a couplet equipment includes DNS data message to the data message that router sends.
Further, described data forwarding module, when forwarding DNS data message, specifically includes:
Second line of a couplet equipment sends DNS request bag to router；
Judge whether the purpose IP address in DNS request bag is included in the dns server of router the machine configuration
In address list；
If it is, described DNS data message is directly forwarded；
If it is not, then described DNS data message is carried out DNS proxy forwarding.
Further, described timing ageing module specifically for:
After creating static ip address-physical address correspondence entry, flag bit Flag, Flag are set for described entry
Initial value is set to 1；
Enable intervalometer；
After described intervalometer triggers, travel through the static ip address-physical address correspondence bar of all band Flag labellings
Mesh；
Whether the value judging Flag is 1；
If the value of Flag is 1, the most described Flag sets to 0；
If the value of Flag is 0, then delete described static ip address-physical address correspondence entry；
Judge whether it is the last item static ip address-physical address correspondence entry；
If it is, replacement intervalometer.
The present invention by the router the method for Dynamic Host Configuration Protocol server, network agent and state table being combined,
Form a total solution.The PC network configuration of the newest couple in router is automatic obtaining mode, also
It is manual specified interface network parameter, can accomplish to revise its current network interface configuration,
To carry out data forwarding by router, the maintenance work of manager is greatly reduced.
Accompanying drawing explanation
Fig. 1 is that the device network interface that realizes that the embodiment of the present invention provides exempts from the method flow diagram of change；
Fig. 2 is the flow chart forwarding DNS data message that the embodiment of the present invention provides；
Fig. 3 is the aging record of timing of embodiment of the present invention offer static IP ground in the corresponding list item of router
The method flow diagram of location-physical address correspondence entry；
Fig. 4 is that the device network interface that realizes that the embodiment of the present invention provides exempts from the system function module block diagram of change.
Detailed description of the invention
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings.It is understood that this
Specific embodiment described by place, is used only for explaining the present invention, rather than limitation of the invention.
Fig. 1 is that the device network interface that realizes that the embodiment of the present invention provides exempts from the method flow diagram of change, the party
Method includes:
Step 101: any interface of router is opened second line of a couplet device network interface and exempts from configuration change function；
At some seam any of router, open second line of a couplet device network interface and exempt from configuration change function, open
After opening this function, it is in the new access network second line of a couplet equipment within same broadcast domain with described interface, need not
Revise its current network interface configuration, i.e. can carry out data forwarding by described router.
Step 102: judge to be in the second line of a couplet device network interface within same broadcast domain with described router interface
Configuration mode whether be manual designated mode；
The configuration mode of second line of a couplet device network interface has automatic mode and manual mode two kinds, when network interface
When configuration mode is arranged to automatic mode, second line of a couplet equipment obtains IP address automatically, and network interface changes
Time, the IP address of second line of a couplet equipment also can change therewith；When the configuration mode of network interface is arranged to manual mould
During formula, the IP address of second line of a couplet equipment is manually set by user in advance, it is impossible to the change of network interface
And change.
Step 103: (Address Resolution Protocol, address resolution is assisted if it is, start ARP
View) agency, carry out ARP trust authentication；
If the configuration mode of second line of a couplet device network interface is not manual designated mode, but during automatic mode,
Then according to DHCP, (Dynamic Host Configuration Protocol, DynamicHost arranges association to router
View) agreement is to second line of a couplet equipment distributed network parameters, and second line of a couplet equipment is after getting network parameter, according to association
View carries out normal data forwarding.
Wherein, DynamicHost arranges agreement (Dynamic Host Configuration Protocol, DHCP)
It is the procotol of a LAN, uses udp protocol (User Datagram Protocol, number of users
According to packet protocol) work, mainly there are two purposes: automatically distribute IP to internal network or Internet service provider
Address, to user or internal network manager as the means that all computers are made central management.
If the configuration mode of second line of a couplet device network interface is manual designated mode, then open ARP proxy, tool
Body includes: second line of a couplet equipment carries out ARP request to the gateway IP specified；The ARP request received according to interface,
Construct corresponding ARP with the physical address of described interface and respond bag；Start ARP trust authentication process.
Step 104: judge whether by ARP trust authentication；
Wherein, ARP (Address Resolution Protocol, address resolution protocol) is to obtain physically
One ICP/IP protocol of location.After the ARP request of the IP address of certain node is broadcast on network, this
Node can receive the response confirming its physical address, and such packet just can be sent out.
Proxy ARP is a mutation of ARP protocol.For be configured without default gateway computer will and its
Computer in his network realizes communication, and gateway receives the ARP request of source computer can use the physics of oneself
Address carries out response with the IP address of object-computer to source computer.Proxy ARP is exactly to be made by a main frame
For another host A RP is carried out response.It can make to add one in the case of not affecting routing table newly
Router so that subnet becomes more transparence for this main frame.The use of proxy ARP is usually and uses
On the network being configured without default gateway and routing policy.
Step 105: if it is, by the IP address of the physical address of described second line of a couplet equipment Yu described second line of a couplet equipment
Corresponding record is in the corresponding list item of router；
If ARP the result is believable, add an IP-physical address record entry the most in the router,
Arranging flag bit Flag, Flag initial value is set to 1.Wherein, IP is the physical address of second line of a couplet equipment, just
Being the IP address manually set, physical address is the physical address of described second line of a couplet equipment.
If ARP the result is insincere, the most do not make any process.
Step 106: second line of a couplet equipment sends datagram to router；
Wherein, second line of a couplet equipment includes DNS data message to the data message that router sends.
Fig. 2 is the flow chart forwarding DNS data message that the embodiment of the present invention provides, such as Fig. 2 institute
Show, DNS data message carried out forwarding and specifically includes step 1061～step 1065:
Step 1061: second line of a couplet equipment sends DNS request bag to router；
Step 1062: judge whether the purpose IP address in DNS request bag is included in the configuration of router the machine
In dns server address list, if it is, perform step 1063, if it does not, perform step 1064；
Step 1063: described DNS data message is directly forwarded；
Step 1064: described DNS data message is carried out DNS proxy forwarding.
Wherein, DNS (Domain Name System, domain name system), is a kernel service of the Internet,
It is as the distributed data base that can domain name and IP address be mutually mapped, it is possible to make people more easily
Access the Internet, and do not spend the IP number string remembeing to be directly read by machine.
Step 107: set up data stream list, in institute according to the five-tuple of the described second line of a couplet equipment sent datagram
State and data stream list records the information that router receives the incoming interface of described data message；
Router receives the forwarding data packets of second line of a couplet equipment, according to the forwarding strategy of configuration on router, sentences
Whether disconnected packet meets forwarding strategy, and the packet meeting forwarding strategy is exempted from from second line of a couplet device network interface
Configuration is changed and is forwarded to other interface on the interface of function, sets up data stream list according to five-tuple, and at this
Stream table records the incoming interface information of described packet.
Step 108: described data message is forwarded；
Step 109: when the response bag of described data message arrives router, find according to described data stream list
Outgoing interface；
Step 110: according to the physical address of second line of a couplet equipment in the list item of described router and described second line of a couplet equipment
The record of IP address, finds the physical address that the reference address of described data message is corresponding, sends data.
Wherein, described method also include timing aging record static ip address in the corresponding list item of router-
Physical address correspondence entry.Fig. 3 is that the aging record of timing of embodiment of the present invention offer is in router respective table
The method flow diagram of the static ip address in Xiang-physical address correspondence entry, as it is shown on figure 3, timing is aging
Record static ip address-physical address correspondence entry in the corresponding list item of router farther includes:
Step 1101: after creating static ip address-physical address correspondence entry, mark is set for described entry
Position Flag, Flag initial value is set to 1；
Step 1102: enable intervalometer；
Step 1103: after intervalometer triggers, travel through the static ip address-physical address of all band Flag labellings
Corresponding entry；
Step 1104: whether the value judging Flag is 1, if it is, perform step 1105, if it does not,
Then perform step 1106；
Step 1105: described Flag sets to 0；
Step 1106: delete described static ip address-physical address correspondence entry；
Step 1107: judge whether it is the last item static ip address-physical address correspondence entry；
Step 1108: if it is, reset intervalometer.
Fig. 4 is that the device network interface that realizes that the embodiment of the present invention provides exempts from the system function module block diagram of change,
As shown in Figure 4, the described device network interface that realizes exempts from the device of change, it is characterised in that including: function
Opening module 410, exempts from configuration change merit for any interface of router is opened second line of a couplet device network interface
Energy；First judge module 401, the second line of a couplet within judgement and described router interface are in same broadcast domain
Whether the configuration mode of device network interface is manual designated mode；ARP trust authentication module 402, is used for
When the configuration mode of second line of a couplet device network interface is manual designated mode, starting ARP proxy, carrying out ARP can
Letter checking；Second judge module 403, is used for judging whether by ARP trust authentication；Entry creation module
404, for after by ARP trust authentication, by the IP ground of the physical address of second line of a couplet equipment with second line of a couplet equipment
Corresponding the recording in the corresponding list item of router in location；Request sending module 405, is used for sending datagram
Literary composition；Data stream list creation module 406, for setting up number according to the five-tuple of the second line of a couplet equipment sent datagram
According to stream table, data stream list records the information that router receives the incoming interface of data message；Data forward mould
Block 407, for forwarding data message；Search module 408, wrap for the response at data message
When reaching router, find outgoing interface information according to data stream list；Data transmission blocks 409, for according to route
In the list item of device, the physical address of second line of a couplet equipment and the record of the IP address of second line of a couplet equipment, find data message
The physical address that reference address is corresponding, sends data.
Wherein, second line of a couplet equipment includes DNS data message to the data message that router sends, and data forward mould
Block 407, when forwarding DNS data message, specifically includes: second line of a couplet equipment sends DNS request bag to router；
Judge whether the purpose IP address in DNS request bag is included in the dns server address of router the machine configuration
In list；If it is, described DNS data message is directly forwarded；If it is not, then to described DNS
Data message carries out DNS proxy forwarding.
Described device also includes timing ageing module, for the aging record of timing in the corresponding list item of router
Static ip address-physical address correspondence entry.
Wherein, regularly ageing module specifically for:
After creating static ip address-physical address correspondence entry, flag bit Flag, Flag are set for described entry
Initial value is set to 1；Enable intervalometer；After described intervalometer triggers, travel through the quiet of all band Flag labellings
State IP address-physical address correspondence entry；Whether the value judging Flag is 1；If the value of Flag is 1,
The most described Flag sets to 0；If the value of Flag is 0, then delete described static ip address-physical address corresponding
Entry；Judge whether it is the last item static ip address-physical address correspondence entry；Determine if it is, reset
Time device.
The present invention by the router the method for Dynamic Host Configuration Protocol server, network agent and state table being combined,
Form a total solution.The PC network configuration of the newest couple in router is automatic obtaining mode, also
It is manual specified interface network parameter, can accomplish to revise its current network interface configuration,
To carry out data forwarding by router, the maintenance work of manager is greatly reduced.
Below it is only the explanation done for the preferred embodiments of the present invention and know-why thereof, and not to this
The restriction that the technology contents of invention is carried out, any those familiar with the art is public in present invention institute
In the technical scope opened, the change being readily apparent that or replacement, all should contain within the scope of the present invention.
Claims (11)
1. one kind realizes the method that device network interface exempts to change, it is characterised in that including:
Any interface of router is opened second line of a couplet device network interface and exempts from configuration change function；
Judgement and described router interface are in the configuration side of the second line of a couplet device network interface within same broadcast domain
Whether formula is manual designated mode；
If it is, start ARP (Address Resolution Protocol, address resolution protocol) agency,
Carry out ARP trust authentication；
Judge whether by ARP trust authentication；
If it is, by note corresponding with the IP address of described second line of a couplet equipment for the physical address of described second line of a couplet equipment
Record is in the corresponding list item of router；
Second line of a couplet equipment sends datagram to router；
Five-tuple according to the described second line of a couplet equipment sent datagram sets up data stream list, at described data stream
Table records the information that router receives the incoming interface of described data message；
Described data message is forwarded；
When the response bag of described data message arrives router, find outgoing interface according to described data stream list；
The physical address of second line of a couplet equipment and the IP address of described second line of a couplet equipment in list item according to described router
Record, find the physical address that the reference address of described data message is corresponding, send data.
Method the most according to claim 1, it is characterised in that described method also includes the aging note of timing
Record static ip address-physical address correspondence entry in the corresponding list item of described router.
Method the most according to claim 1, it is characterised in that if the joining of second line of a couplet device network interface
Mode of putting is not manual designated mode, then router is according to DHCP (Dynamic Host Configuration
Protocol, DynamicHost arranges agreement) agreement gives described second line of a couplet equipment distributed network parameters, and carry out data and turn
Send out.
Method the most according to claim 1, it is characterised in that the number that second line of a couplet equipment sends to router
DNS (Domain Name System, domain name system) data message is included according to message.
Method the most according to claim 4, it is characterised in that carry out described DNS data message turning
Give out a contract for a project and include:
Second line of a couplet equipment sends DNS request bag to router；
Judge whether the purpose IP address in DNS request bag is included in the dns server of router the machine configuration
In address list；
If it is, described DNS data message is directly forwarded；
If it is not, then described DNS data message is carried out DNS proxy forwarding.
Method the most according to claim 2, it is characterised in that the most aging record is at described router
Static ip address-physical address correspondence entry in corresponding list item farther includes:
After creating static ip address-physical address correspondence entry, flag bit Flag, Flag are set for described entry
Initial value is set to 1；
Enable intervalometer；
After described intervalometer triggers, travel through the static ip address-physical address correspondence bar of all band Flag labellings
Mesh；
Whether the value judging Flag is 1；
If the value of Flag is 1, the most described Flag sets to 0；
If the value of Flag is 0, then delete described static ip address-physical address correspondence entry；
Judge whether it is the last item static ip address-physical address correspondence entry；
If it is, replacement intervalometer.
7. one kind realizes the device that device network interface exempts to change, it is characterised in that including:
Function opening module, changes for any interface of router unlatching second line of a couplet device network interface is exempted from configuration
Dynamic function；
First judge module, for judging that the second line of a couplet being within same broadcast domain with described router interface sets
Whether the configuration mode of standby network interface is manual designated mode；
ARP trust authentication module, is manual designated mode for the configuration mode at second line of a couplet device network interface
Time, start ARP proxy, carry out ARP trust authentication；
Second judge module, is used for judging whether by ARP trust authentication；
Entry creation module, for after by ARP trust authentication, by the physical address of described second line of a couplet equipment
The record corresponding with the IP address of described second line of a couplet equipment is in the corresponding list item of router；
Request sending module, is used for sending datagram；
Data stream list creation module, the five-tuple of the second line of a couplet equipment for sending datagram described in basis is set up
Data stream list, records the information that router receives the incoming interface of described data message in described data stream list；
Data forwarding module, for forwarding described data message；
Search module, for when the response bag of described data message arrives router, according to described data stream
Table finds outgoing interface information；
Data transmission blocks, is used for according to the physical address of second line of a couplet equipment in the list item of described router with described
The record of the IP address of second line of a couplet equipment, finds the physical address that the reference address of described data message is corresponding, sends out
Send data.
Device the most according to claim 7, it is characterised in that described device also includes the aging mould of timing
Block is corresponding for timing aging record static ip address-physical address in the corresponding list item of described router
Entry.
Device the most according to claim 7, it is characterised in that the number that second line of a couplet equipment sends to router
DNS data message is included according to message.
Device the most according to claim 9, it is characterised in that described data forwarding module is forwarding
During DNS data message, specifically include:
Second line of a couplet equipment sends DNS request bag to router；
Judge whether the purpose IP address in DNS request bag is included in the dns server of router the machine configuration
In address list；
If it is, described DNS data message is directly forwarded；
If it is not, then described DNS data message is carried out DNS proxy forwarding.
11. devices according to claim 8, it is characterised in that described timing ageing module is specifically used
In:
After creating static ip address-physical address correspondence entry, flag bit Flag, Flag are set for described entry
Initial value is set to 1；
Enable intervalometer；
After described intervalometer triggers, travel through the static ip address-physical address correspondence bar of all band Flag labellings
Mesh；
Whether the value judging Flag is 1；
If the value of Flag is 1, the most described Flag sets to 0；
If the value of Flag is 0, then delete described static ip address-physical address correspondence entry；
Judge whether it is the last item static ip address-physical address correspondence entry；
If it is, replacement intervalometer.
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| CN201310092460.7A CN103209129B (en) | 2013-03-21 | 2013-03-21 | A kind of realize device network interface exempt from change method and apparatus |
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| CN104378277B (en) * | 2014-11-11 | 2018-06-19 | 上海斐讯数据通信技术有限公司 | The method that broadband cat and its LAN causes for gossip are now surfed the Internet |
| CN114882631B (en) * | 2022-06-06 | 2023-08-01 | 创斯达科技集团(中国)有限责任公司 | Self-adaptive intelligent gate network configuration method and gate system |
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| US6768743B1 (en) * | 1999-10-26 | 2004-07-27 | 3Com Corporation | Method and system for address server redirection for multiple address networks |
| CN101605153A (en) * | 2008-06-13 | 2009-12-16 | 中磊电子股份有限公司 | Utilize route device to carry out the method for address protocol analysis |
| CN102387223A (en) * | 2011-10-20 | 2012-03-21 | 北京科美特信息技术有限公司 | Management and distribution method of public network IP (Internet Protocol) address resource of hotel public network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6768743B1 (en) * | 1999-10-26 | 2004-07-27 | 3Com Corporation | Method and system for address server redirection for multiple address networks |
| CN101605153A (en) * | 2008-06-13 | 2009-12-16 | 中磊电子股份有限公司 | Utilize route device to carry out the method for address protocol analysis |
| CN102387223A (en) * | 2011-10-20 | 2012-03-21 | 北京科美特信息技术有限公司 | Management and distribution method of public network IP (Internet Protocol) address resource of hotel public network |
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