CN101656764A - Method, system and device for keeping session of DHCP user active - Google Patents
Method, system and device for keeping session of DHCP user active Download PDFInfo
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- CN101656764A CN101656764A CN200910176043A CN200910176043A CN101656764A CN 101656764 A CN101656764 A CN 101656764A CN 200910176043 A CN200910176043 A CN 200910176043A CN 200910176043 A CN200910176043 A CN 200910176043A CN 101656764 A CN101656764 A CN 101656764A
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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
- H04L61/50—Address allocation
- H04L61/5053—Lease time; Renewal aspects
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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
- H04L61/50—Address allocation
- H04L61/5007—Internet protocol [IP] addresses
- H04L61/5014—Internet protocol [IP] addresses using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
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Abstract
The embodiment of the invention discloses a method for keeping session of dynamic host configuration protocol (DHCP) user equipment active, which comprises the following steps: after a DHCP client isaccessed to user and service control node (SN) equipment, the SN equipment transmits a DHCP FORCE RENEW message to the DHCP client; and after not receiving a DHCP REQUEST message which is transmittedby the DHCP client and responses to the DHCP FORCE RENEW message, the SN equipment determines that the DHCP FORCE RENEW message is in an inactive state and releases resource allocated to the DHCP client. The embodiment of the invention also discloses a DHCP communication system. The invention can effectively save the resource of the SN equipment for maintaining the on-line state of the DHCP client.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of DHCP (Dynamic Host Configuration Protocol, the DHCP) mthods, systems and devices of user's session keepalive.
Background technology
After DHCP user inserts user and business control nodes (SN) equipment by access node (AN) equipment; DHCP user reaches the standard grade; SN equipment sends to DHCP user with IP address allocated; and this DHCP user's identification information added in the user conversation table, and regularly the DHCP user in the user conversation table is carried out session keepalive.DHCP user is carried out session keepalive to be meant; survey DHCP user and whether be in active state; be whether DHCP user is online or be in the session connection state with system; after detecting DHCP user and being in non-active state; this DHCP user's of deletion identification information in the user conversation table; and be released to the resource that this DHCP user distributes, to avoid the DHCP CU system resource of abnormal off-line.
At present, the mode that the DHCP user who inserts by SN equipment is carried out session keepalive generally is to adopt the keep-alive of DHCP window lock in time mode.
The keep-alive mode of DHCP window lock in time is meant, DHCP user can receive the DHCP rental period information that SN equipment is sent after reaching the standard grade, time period length of this rental period information representation, arrive after date in the time of re-renting, if this DHCP user also is in active state, then send DHCP to SN equipment and re-rent request, SN equipment is re-rented according to the DHCP that receives and is asked to judge that this DHCP user is online; If SN equipment does not receive the DHCP that DHCP user sends in the DHCP rental period to after date and re-rents request, judge that then this DHCP user is at off-line.
In realizing process of the present invention, the inventor finds to exist in the prior art following technical problem:
The keep-alive mode of DHCP window lock in time of available technology adopting promptly expires and does not receive DHCP that this DHCP user sends when re-renting request when DHCP user's the DHCP rental period, and SN equipment thinks that this DHCP user is inactive.Because the DHCP rental period that existing network is provided with is very long, so if DHCP user's abnormal off-line in quite short time after reaching the standard grade, DHCP rental period this moment is also not yet due, DHCP user but has been in non-active state, and that SN equipment need be kept this DHCP user's online state is expired up to the rental period, thereby caused user's abnormal off-line to the DHCP rental period overdue during this period of time in, SN equipment need keep the actual DHCP user's online state that is in non-active state, wasted device resource greatly, particularly attacked or during user's abnormal off-line in enormous quantities, the address of SN equipment and user conversation table resource can be suffered great waste.
Summary of the invention
The embodiment of the invention provides the mthods, systems and devices of a kind of DHCP user's session keepalive, is used to save SN equipment and keeps DHCP user's online state resource needed.
A kind of method of session keepalive of dhcp client, this method comprises:
SN equipment is after dhcp client inserts described SN equipment, and described SN equipment sends DHCP to described dhcp client and forces to upgrade message;
Described SN equipment does not receive after the described DHCP of response that described dhcp client sends forces to upgrade the DHCP request message of message overtime, determines that described dhcp client is in non-active state, and is released to the resource that described dhcp client distributes.
A kind of DHCP data system, this system comprises:
SN equipment is used for after dhcp client inserts described SN equipment, sends DHCP to described dhcp client and forces to upgrade message; Do not receive after the described DHCP of response that described dhcp client sends forces to upgrade the DHCP request message of message overtime, determine that described dhcp client is in non-active state, and be released to the resource that described dhcp client distributes;
Dhcp client is used for sending the DHCP request message that the described DHCP of response forces the renewal message to described SN equipment after receiving described DHCP pressure renewal message.
A kind of SN equipment, this equipment comprises:
DHCP forces to upgrade packet sending unit, is used for after dhcp client inserts described SN equipment, sends DHCP to described dhcp client and forces to upgrade message;
Non-active state processing unit, be used for not receiving after the described DHCP of response that described dhcp client sends forces to upgrade the DHCP request message of message overtime, determine that described dhcp client is in non-active state, and be released to the resource that described dhcp client distributes.
Among the present invention, SN equipment is after dhcp client inserts this SN equipment, and SN equipment sends DHCP to this dhcp client and forces to upgrade message; SN equipment does not receive after response DHCP that dhcp client sends forces to upgrade the DHCP request message of message overtime, determines that dhcp client is in non-active state, and is released to the resource that this dhcp client distributes.As seen, SN equipment can be real-time pass through send the DHCP can trigger the dhcp client feedback DHCP request message that is in active state to dhcp client and force to upgrade message, and judge the current active state that whether is in of dhcp client according to whether receiving the DHCP request message, could determine the current state of dhcp client according to whether receiving the DHCP request of re-renting that dhcp client sends and needn't wait until that the DHCP rental period expires, and then can avoid user's abnormal off-line to the DHCP rental period overdue during this period of time in, the wasting of resources that SN equipment need keep the actual presence that is in the dhcp client of non-active state to cause.
Description of drawings
The method flow schematic diagram that Fig. 1 provides for the embodiment of the invention;
Fig. 2 is the schematic flow sheet of the specific embodiment of the invention;
The system configuration schematic diagram that Fig. 3 provides for the embodiment of the invention;
The device structure schematic diagram that Fig. 4 provides for the embodiment of the invention.
Embodiment
Keep the presence resource needed of dhcp client in order to save SN equipment; the embodiment of the invention provides a kind of method of session keepalive of dhcp client; in this method; SN equipment sends DHCP to the dhcp client that inserts and forces to upgrade message (DHCP FORCE RENEW); force to upgrade the DHCP request message (DHCP REQUEST) of message according to whether receiving this DHCP of response that dhcp client sends; determine the current state of dhcp client, and whether decision is released to the resource that this dhcp client distributes.
Referring to Fig. 1, the method for the session keepalive of the dhcp client that the embodiment of the invention provides specifically may further comprise the steps:
Step 10:SN equipment is after dhcp client inserts this SN equipment, and this SN equipment sends DHCP to described dhcp client and forces to upgrade message;
Step 11:SN equipment determines whether to receive the DHCP request message that response DHCP that dhcp client sends forces to upgrade message;
Step 12:SN equipment does not determine that dhcp client is in non-active state receive the DHCP request message that dhcp client sends when overtime after, and is released to the resource that this dhcp client distributes; Here overtime can refer to predefined timer expiry.
In the step 10, DHCP FORCE RENEW is a kind of DHCP probe messages of RFC3203 regulation, being described below DHCP FORCE RENEW message in this RFC:
Dynamic Host Configuration Protocol server sends a FORCE RENEW message to client, and after client received this FORCE RENEW message, oneself state was set to upgrade (RENEW) state, and carried out the rental period according to normal DHCP flow process and upgrade.If server determines and will distribute a new IP address for client that server will be replied a DHCP negative response (DHCPNAK) to the DHCP request message (DHCP REQUEST) that the client that receives is sent.Client then returns to initial condition and broadcasts a DHCP and recover message (DHCP DISCOVER message).Server just sends to client by the new IP address that DHCP provides message (DHCP OFFER) to distribute.
As seen, DHCP FORCE RENEW message is a kind of message that can allow dhcp client initiatively re-rent, and can also allow dhcp client obtain new address again by sending this message.
SN equipment regularly sends DHCP to dhcp client according to pre-configured time cycle and forces to upgrade message, and should the time cycle less than half rental period of DHCP of distributing.
In the step 12, SN equipment can be after at least twice transmission DHCP forces to upgrade message and does not receive a DHCP request message continuously, be released to the resource that this dhcp client distributes, for example, the information of this dhcp client of deletion in the user conversation table, and be released to dhcp client IP address allocated etc.
Preferable, after dhcp client inserted SN equipment, SN equipment obtained the DHCP rental period information of distribution; After send DHCP pressure renewal message to dhcp client after, receiving the DHCP request message, the DHCP request message is being sent to Dynamic Host Configuration Protocol server when the DHCP rental period, information determined that the time of re-renting expires, the time of re-renting can for the DHCP rental period half or 3/4ths; Dynamic Host Configuration Protocol server determines that according to the DHCP request message current state of dhcp client is online.
Here, SN equipment can be DHCP relay equipment, and DHCP relay equipment obtains the DHCP rental period information of this server-assignment from Dynamic Host Configuration Protocol server.
Preferable, after SN equipment is released to the resource of dhcp client distribution, SN equipment receives the request of re-renting that dhcp client is sent, then restart dhcp process, and be used in and keep the online resource of dhcp client for this dhcp client branch, for example, in the user conversation table, increase the information of this dhcp client, and be dhcp client distributing IP address etc.
Introduce two embodiment of the present invention below respectively:
Embodiment one:
In the present embodiment, SN equipment is DHCP SERVER, and after dhcp client inserted DHCP SERVER, DHCP SERVER sent to dhcp client with IP address allocated, and after this user gateway (RG) abnormal power-down causes dhcp client inactive.Referring to Fig. 2, idiographic flow is as follows:
Steps A 1:DHCP client inserts DHCP SERVER.
Step B1:DHCP SERVER sends DHCP FORCERENEW message according to configuration rule to dhcp client.
Under the online situation of step C1:DHCP client, the DHCP protocol stack of dhcp client receives DHCP FORCE RENEW message, and dhcp state is updated to RENEW, and the DHCP protocol stack sends DHCP REQUEST to DHCP SERVER.
Step D1:DHCP SERVER receives DHCP REQUEST, determines that dhcp client is in active state, returns DHCP ACK message to dhcp client, and the user re-rents success.
Step e 1: this moment, RG was unusual, and dhcp client goes offline, and DHCP SERVER sends DHCP FORCE RENEW message to dhcp client, and dhcp client is not done any response.
Step F 1:DHCP SERVER after sending DHCP FORCERENEW message several times and not receiving DHCP REQUEST, judges that dhcp client is in non-active state according to collocation strategy, is released to the resource that dhcp client distributes.
Embodiment two:
In the present embodiment, SN equipment is DHCP RELAY, after dhcp client inserted DHCP RELAY, DHCP RELAY sent to dhcp client with DHCP SERVER IP address allocated, and after this link failure causes dhcp client inactive between dhcp client and DHCP RELAY.Still referring to Fig. 2, idiographic flow is as follows:
Steps A 2:DHCP client inserts DHCP RELAY, and DHCP RELAY gives dhcp client to far-end DHCPSERVER application IP address and with this IP address assignment, the DHCP rental period that DHCP RELAY record DHCP SERVER distributes.
Step B2:DHCP RELAY sends DHCP FORCERENEW message according to configuration rule to dhcp client.
Under the online situation of step C2:DHCP client, the DHCP protocol stack of dhcp client receives DHCP FORCE RENEW message, and dhcp state is updated to RENEW, and the DHCP protocol stack sends DHCP REQUEST to DHCP SERVER.
Step D2:DHCP RELAY receives DHCP REQUEST, determines that dhcp client is in active state, returns DHCP ACK message to dhcp client, and the user re-rents success.
Step e 2:DHCP RELAY replaces dhcp client initiatively to send the DHCP REQUEST that comprises this dhcp client address to far-end DHCPSERVER at DHCP in the rental period, concern with the address lease between synchronous far-end DHCP SERVER and the user.
Step F 2: link failure causes dhcp client inactive between dhcp client and DHCP RELAY at this moment, and DHCP RELAY sends DHCP FORCE RENEW message to dhcp client, and dhcp client is not done any response.
Step G2:DHCP RELAY according to collocation strategy after sending DHCP FORCE RENEW message several times and all not receiving DHCP REQUEST, judge that dhcp client is in non-active state, send DHCP RELEASE to far-end DHCP SERVER, inform that DHCP SERVER discharges the resource that this inactive dhcp client takies.
Referring to Fig. 3, the embodiment of the invention also provides a kind of DHCP data system, and this system comprises:
Described SN equipment 30 also is used for:
After dhcp client inserts described SN equipment, obtain the DHCP rental period information of distribution; Sending to described dhcp client after DHCP forces to upgrade message, receive described DHCP request message, described DHCP request message is being sent to described Dynamic Host Configuration Protocol server when the described DHCP rental period, information determined that the time of re-renting expires;
Described Dynamic Host Configuration Protocol server is used for, and determines the current state of described dhcp client according to described DHCP request message.
Described SN equipment 30 also is used for:
After being released to the resource that dhcp client distributes, receive the request of re-renting that dhcp client is sent, restart dhcp process, and redistribute for this dhcp client and to be used to keep the online resource of described dhcp client.
Described SN equipment 30 is used for:
Regularly send DHCP according to the pre-configured time cycle and force to upgrade message, and the described time cycle is less than half rental period of DHCP of Dynamic Host Configuration Protocol server distribution to described dhcp client.
Referring to Fig. 4, the embodiment of the invention also provides a kind of SN equipment, and this equipment comprises:
Non-active state processing unit 41, after being used for when overtime, not receiving the described DHCP of response that described dhcp client sends and forcing to upgrade the DHCP request message of message, determine that described dhcp client is in non-active state, and be released to the resource that described dhcp client distributes.
Described SN equipment also comprises:
Rental period lock unit 42 is used for after dhcp client inserts described SN equipment, obtains the DHCP rental period information of distribution; Sending to described dhcp client after DHCP forces to upgrade message, receive described DHCP request message, described DHCP request message is being sent to described Dynamic Host Configuration Protocol server when the described DHCP rental period, information determined that the time of re-renting expires.
Described SN equipment also comprises:
Time window identifying unit 43 is used for receiving the request of re-renting that dhcp client is sent after the resource that is released to the dhcp client distribution, restarts dhcp process, and keeps the online resource of described dhcp client for this dhcp client branch is used in.
Described packet sending unit 40 is used for:
Regularly send DHCP according to the pre-configured time cycle and force to upgrade message, and the described time cycle is less than half rental period of DHCP of Dynamic Host Configuration Protocol server distribution to described dhcp client.
Among the present invention, SN equipment is not limited to above-mentioned Dynamic Host Configuration Protocol server and DPCH trunking, can also be any equipment that other can be communicated by letter with Dynamic Host Configuration Protocol server.
To sum up, beneficial effect of the present invention comprises:
In the scheme that the embodiment of the invention provides, SN equipment is after dhcp client inserts this SN equipment, and this SN equipment sends DHCP to this dhcp client and forces to upgrade message; SN equipment does not receive when overtime after response DHCP that dhcp client sends forces to upgrade the DHCP request message of message, determines that dhcp client is in non-active state, and is released to the resource that this dhcp client distributes.As seen, SN equipment can be real-time pass through send the DHCP can trigger the dhcp client feedback DHCP request message that is in active state to dhcp client and force to upgrade message, and judge the current active state that whether is in of dhcp client according to whether receiving the DHCP request message, could determine the current state of dhcp client according to whether receiving the DHCP request of re-renting that dhcp client sends and needn't wait until that the DHCP rental period expires, and then can avoid user's abnormal off-line to the DHCP rental period overdue during this period of time in, the wasting of resources that SN equipment need keep the actual presence that is in the dhcp client of non-active state to cause.
Further, SN equipment adopts DHCP protocol stack regulation DHCP FORCE RENEW message to trigger user's response, thereby whether survey the user active.Because it is that legal message can not cause attack to the user that DHCP force to upgrade message, so DHCP FORCE RENEW message can not thought by mistake be attack message and cause the user not have response by subscriber's main station.
Further, because DHCP FORCE RENEW message is a unicast message, therefore can not cause this message to be eavesdropped.
Further, when SN equipment was DHCP RELAY, SN equipment need regularly be re-rented the abnormal off-line up to the user to far-end DHCP SERVER according to the rental period that far-end DHCPSERVER distributes, with synchronous DHCP SERVER and state of user.
Further, after SN equipment is DHCP RELAY, and SN judgement dhcp client rolls off the production line, need to send DHCP RELEASE to discharge DHCP SERVER resource to DHCP SERVER; When SN equipment was DHCP SERVER, SN equipment was judged initiatively release device resource of the unusual inactive back of user, thereby reaches the purpose of saving resource.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1, the method for a kind of dynamic host configuration protocol DHCP client-side session keep-alive is characterized in that, this method comprises:
User and business control nodes SN equipment are after dhcp client inserts described SN equipment, and described SN equipment sends DHCP to described dhcp client and forces to upgrade message;
Described SN equipment does not receive after the described DHCP of response that described dhcp client sends forces to upgrade the DHCP request message of message overtime, determines that described dhcp client is in non-active state, and is released to the resource that described dhcp client distributes.
2, the method for claim 1 is characterized in that, after dhcp client inserted described SN equipment, this method further comprised:
Described SN equipment obtains the DHCP rental period information of distribution;
After described dhcp client sent DHCP pressure renewal message, this method further comprised at described SN equipment:
Described SN equipment receives described DHCP request message, described DHCP request message is being sent to described Dynamic Host Configuration Protocol server when the described DHCP rental period, information determined that the time of re-renting expires;
Described Dynamic Host Configuration Protocol server is determined the current state of described dhcp client according to described DHCP request message.
3, the method for claim 1 is characterized in that, after SN equipment was released to the resource of dhcp client distribution, this method further comprised:
SN equipment receives the request of re-renting that dhcp client is sent, and restarts dhcp process, and keeps the online resource of dhcp client for this dhcp client branch is used in.
As arbitrary described method among the claim 1-3, it is characterized in that 4, described SN equipment regularly sends DHCP to described dhcp client according to the pre-configured time cycle and forces to upgrade message, and the described time cycle is less than half rental period of DHCP of distributing.
5, a kind of dynamic host configuration protocol DHCP communication system is characterized in that, this system comprises:
User and business control nodes SN equipment are used for after dhcp client inserts described SN equipment, send DHCP to described dhcp client and force to upgrade message; Do not receive after the described DHCP of response that described dhcp client sends forces to upgrade the DHCP request message of message overtime, determine that described dhcp client is in non-active state, and be released to the resource that described dhcp client distributes;
Dhcp client is used for sending the DHCP request message that the described DHCP of response forces the renewal message to described SN equipment after receiving described DHCP pressure renewal message.
6, system as claimed in claim 5 is characterized in that, described SN equipment also is used for:
After dhcp client inserts this SN equipment, obtain the DHCP rental period information of distribution;
Sending to described dhcp client after DHCP forces to upgrade message, receive described DHCP request message, described DHCP request message is being sent to described Dynamic Host Configuration Protocol server when the described DHCP rental period, information determined that the time of re-renting expires;
Described Dynamic Host Configuration Protocol server is used for, and determines the current state of described dhcp client according to described DHCP request message.
7, system as claimed in claim 5 is characterized in that, described SN equipment also is used for:
After the resource that is released to the dhcp client distribution, receive the request of re-renting that dhcp client is sent, restart dhcp process, and keep the online resource of described dhcp client for this dhcp client branch is used in.
8, a kind of user and business control nodes SN equipment is characterized in that this equipment comprises:
Packet sending unit is used for after dhcp client inserts described SN equipment, sends DHCP to described dhcp client and forces to upgrade message;
Non-active state processing unit, be used for not receiving after the described DHCP of response that described dhcp client sends forces to upgrade the DHCP request message of message overtime, determine that described dhcp client is in non-active state, and be released to the resource that described dhcp client distributes.
9, equipment as claimed in claim 8 is characterized in that, described SN equipment also comprises:
The rental period lock unit is used for after dhcp client inserts described SN equipment, obtains the DHCP rental period information of distribution; Sending to described dhcp client after DHCP forces to upgrade message, receive described DHCP request message, described DHCP request message is being sent to described Dynamic Host Configuration Protocol server when the described DHCP rental period, information determined that the time of re-renting expires.
10, equipment as claimed in claim 8 is characterized in that, described SN equipment also comprises:
The time window identifying unit is used for receiving the request of re-renting that dhcp client is sent after the resource that is released to the dhcp client distribution, restarts dhcp process, and keeps the online resource of described dhcp client for this dhcp client branch is used in.
11, as arbitrary described equipment among the claim 8-10, it is characterized in that described packet sending unit is used for:
Regularly send DHCP according to the pre-configured time cycle and force to upgrade message, and the described time cycle is less than half rental period of DHCP of Dynamic Host Configuration Protocol server distribution to described dhcp client.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910176043A CN101656764A (en) | 2009-09-22 | 2009-09-22 | Method, system and device for keeping session of DHCP user active |
| PCT/CN2010/073123 WO2011035598A1 (en) | 2009-09-22 | 2010-05-24 | Dhcp client session keep-alive method, dhcp communication system and sn device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910176043A CN101656764A (en) | 2009-09-22 | 2009-09-22 | Method, system and device for keeping session of DHCP user active |
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| CN101656764A true CN101656764A (en) | 2010-02-24 |
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| CN200910176043A Pending CN101656764A (en) | 2009-09-22 | 2009-09-22 | Method, system and device for keeping session of DHCP user active |
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| WO (1) | WO2011035598A1 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011035598A1 (en) * | 2009-09-22 | 2011-03-31 | 中兴通讯股份有限公司 | Dhcp client session keep-alive method, dhcp communication system and sn device |
| CN102413000A (en) * | 2011-12-23 | 2012-04-11 | 华为数字技术有限公司 | Online method for clients, DHCP (dynamic host configuration protocol) server and network management system |
| CN103095722A (en) * | 2013-02-01 | 2013-05-08 | 华为技术有限公司 | Method for updating network security table and network device and dynamic host configuration protocol (DHCP) server |
| CN103476143A (en) * | 2012-06-07 | 2013-12-25 | 中国移动通信集团公司 | Method, device and system for IP resource releasing of WLAN |
| CN103516766A (en) * | 2012-06-30 | 2014-01-15 | 北京神州泰岳软件股份有限公司 | Method and system of communication between client-side and application server |
| CN104519145A (en) * | 2013-09-26 | 2015-04-15 | 华为技术有限公司 | An address resource managing method, system and DHCP server |
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| CN112804276A (en) * | 2019-11-13 | 2021-05-14 | 中国电信股份有限公司 | Virtualization broadband remote access server, control method thereof and communication system |
| CN113726595A (en) * | 2021-08-06 | 2021-11-30 | 视联动力信息技术股份有限公司 | Detection method and device of timeout client, electronic equipment and storage medium |
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| CN101262384A (en) * | 2007-03-05 | 2008-09-10 | 中兴通讯股份有限公司 | Broadband access system and its used IP address allocation, continued lease and release method |
| CN101335652A (en) * | 2007-06-29 | 2008-12-31 | 华为技术有限公司 | Status detection method, apparatus and system of dynamic host configuring protocol |
| CN101656764A (en) * | 2009-09-22 | 2010-02-24 | 中兴通讯股份有限公司 | Method, system and device for keeping session of DHCP user active |
-
2009
- 2009-09-22 CN CN200910176043A patent/CN101656764A/en active Pending
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2010
- 2010-05-24 WO PCT/CN2010/073123 patent/WO2011035598A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011035598A1 (en) * | 2009-09-22 | 2011-03-31 | 中兴通讯股份有限公司 | Dhcp client session keep-alive method, dhcp communication system and sn device |
| CN102413000A (en) * | 2011-12-23 | 2012-04-11 | 华为数字技术有限公司 | Online method for clients, DHCP (dynamic host configuration protocol) server and network management system |
| CN103476143B (en) * | 2012-06-07 | 2016-05-25 | 中国移动通信集团公司 | A kind of WLAN discharges method, the Apparatus and system of IP resource |
| CN103476143A (en) * | 2012-06-07 | 2013-12-25 | 中国移动通信集团公司 | Method, device and system for IP resource releasing of WLAN |
| CN103516766A (en) * | 2012-06-30 | 2014-01-15 | 北京神州泰岳软件股份有限公司 | Method and system of communication between client-side and application server |
| CN103095722A (en) * | 2013-02-01 | 2013-05-08 | 华为技术有限公司 | Method for updating network security table and network device and dynamic host configuration protocol (DHCP) server |
| CN104519145A (en) * | 2013-09-26 | 2015-04-15 | 华为技术有限公司 | An address resource managing method, system and DHCP server |
| CN106411817A (en) * | 2015-07-29 | 2017-02-15 | 国基电子（上海）有限公司 | Timestamp authentication system and method |
| CN108123851A (en) * | 2017-12-29 | 2018-06-05 | 北京奇虎科技有限公司 | The lifetime detection method and device of main and subordinate node synchronization link in distributed system |
| CN112804276A (en) * | 2019-11-13 | 2021-05-14 | 中国电信股份有限公司 | Virtualization broadband remote access server, control method thereof and communication system |
| CN112804276B (en) * | 2019-11-13 | 2023-04-07 | 中国电信股份有限公司 | Virtual broadband remote access server, control method thereof and communication system |
| CN113726595A (en) * | 2021-08-06 | 2021-11-30 | 视联动力信息技术股份有限公司 | Detection method and device of timeout client, electronic equipment and storage medium |
| CN113726595B (en) * | 2021-08-06 | 2024-03-19 | 视联动力信息技术股份有限公司 | Detection method and device of timeout client, electronic equipment and storage medium |
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| WO2011035598A1 (en) | 2011-03-31 |
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