CN100558081C - The keepalive method of address repeat listing and system - Google Patents
The keepalive method of address repeat listing and system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/255—Maintenance or indexing of mapping tables
- H04L61/2553—Binding renewal aspects, e.g. using keep-alive messages
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
Abstract
The invention discloses a kind of keepalive method of address repeat listing, comprising: proxy service device sends the keep-alive message to the equipment with network address translation function; After equipment with network address translation function is received the keep-alive message, will with the ageing time reclocking of the address repeat listing of keep-alive message address coupling.The invention also discloses a kind of keep-alive system of address repeat listing.The present invention is to the call business among the NGN; by sending the keep-alive message; refresh corresponding address forwarding-table item on the equipment with network address translation function, and then solved session in the prior art and exist but have the problem that does not have the corresponding address forwarding-table item on the equipment of network address translation function.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of keepalive method and system of address repeat listing.
Background technology
Development along with the IP technology, VoIP (Voice over Internet Protocol, utilize the Voice over IP Business Stream) technology favored gradually, be subjected to the approval of each big operator and enterprise gradually based on the NGN (NextGeneration Network, next generation network) of SoftSwitch (soft switch) technology.The NGN network configuration comprises as shown in Figure 1: SML, network control layer, core exchange layer and edge access layer.Wherein, SML comprises: iOSS (integrated Operation Support System, integrated Operation Support System), strategic server, U-NICA (Universal Network Intelligent CoreArchitecture, Universal Network) application server, IN (intelligent network, IntelligentNetwork); Network control layer comprises Softswitch; Core exchange layer comprises packet-based core networks; Edge access layer comprises: broadband access equipment, for example IAD (Integrated Access Device, integrated access equipment); PSTN (Public Switched Telephone Network, PSTN) equipment; PLMN (Public Land Mobile Network, public land mobile network), for example 2G/3G access device; Subscriber equipment, for example subscriber equipmenies such as SIP (Session Initiation Protocol, session begins agreement)/H.323 phone, POTS (Plain Old Telephone Service, plain old telephone interface) and 2G/3G terminal.
NGN adopts packet-based transmission mode and unified agreement, support diversified access way, separate with carrying by control is separated, called out to business with calling control, realize relatively independent business system, allow business and network that also independent development is provided respectively.This business is independent of network more flexible and has satisfied the user and bring in constant renewal in professional demand, also makes the network have ability of sustainable development.When carrying out Signalling exchange in the NGN business; in order to guarantee normal addressing of media stream message and route; usually can carry address information in the protocol message payload; RTP (Real-time TransportProtocol as dynamic negotiation in the signalling interactive process; RTP) or RTCP (Real-time Transport Control Protocol, RTCP Real-time Transport Control Protocol) address and port information.
In order to solve problems such as IP address depletion, Internet resources contention, need increase NAT (Net Address Translation at the internal network edge of the router that connects backbone network, network address translation), as shown in Figure 2, be the NGN network structure that has NAT device in the prior art.When the IP packet of sending when internal network arrived NAT device, NAT was responsible for internal network IP address transition is become the legitimate ip address of backbone network; After the packet of sending as the outside arrived NAT, NAT was by the information in the mapping table of consulting NAT and preserving, and the IP address transition of backbone network is become the IP address of internal network, was forwarded to inside terminals again.In order to improve the fail safe of internal network, need use fire compartment wall in the internal network exit simultaneously, limit the type and the flow that enter the internal network packet.And IP-based voice, video communication protocols, require to use between the terminal IP address and port numbers to set up data communication channel, therefore each terminal of dilemma: NGN having occurred must intercept external calling at any time, and any packet that invites oneself passes through but fire compartment wall does not but allow outer net.
When professional cross-over NAT equipment of NGN or fire compartment wall etc. have the equipment of network address translation function, because the NAT/ fire compartment wall is only changed the address and the port numbers of IP heading, and H.323, SIP and MGCP (Media Gateway Control Protocol, MGCP) etc. the real medium stream information of agreement is to be placed in the payload of IP bag to transmit, private net address in the payload can't be mapped to public network address and be sent to the opposite end by the NAT/ fire compartment wall, and therefore crossing over the NAT/ fire compartment wall can't realize communication.
In order to realize the professional cross-over NAT equipment/fire compartment wall of NGN, prior art provides ALG (Application Level Gateway, ALG) technology.ALG also changes appropriate address information field embedded in the IP heading payload when address transition as the enhancing of NAT/ fire compartment wall, for example rewrites the Contact field in the Session Initiation Protocol Register message.But this scheme requires NAT device/fire compartment wall is upgraded so that support the ALG function, and this NAT device of enterprise network disposed to(for) great majority is to be difficult for realizing, and the session existence does not still have the problem of corresponding NAT forwarding-table item still to exist.
The another kind of scheme of the professional passing through NAT/fire compartment wall of NGN is Full Proxy (Full Proxy), and this scheme is to increase proxy service device in NAT device/fire compartment wall outside, as shown in Figure 3, is the NGN network structure that has proxy service device in the prior art.The signaling flow and the Media Stream of all-calls are all transferred by proxy service device.When outside NAT device/fire compartment wall, increasing proxy service device, the message that the soft switch side is come is acted on behalf of via proxy service device, owing to calling signaling stream and Media Stream are acted on behalf of at proxy service device, and write down the information of soft switch side and end side, therefore can passing through NAT/fire compartment wall.
In store NAT/ fire compartment wall user's log-on message on the proxy service device comprises the IP address and the port numbers of NAT/ fire compartment wall, also keeps corresponding N AT list item simultaneously on the NAT/ firewall box.But there is an ageing time in the map addresses list item in NAT device/fire compartment wall, does not use if list item is long-time occupied the NAT list item is taken, and for the reason that guarantees its efficient, NAT list item ageing time is shorter, can be aging after list item is overtime.Therefore carry out in session that some list item may be aging and deleted because of the list item on the equipment with network address translation function in the process, thereby cause session to exist but have the problem that does not have the corresponding address forwarding-table item on the equipment of network address translation function.
Summary of the invention
The embodiment of the invention provides a kind of keepalive method and system to address repeat listing in the network address translation apparatus, but there is the problem that does not have the corresponding address forwarding-table item on the equipment with network address translation function in the proxy service device session in the prior art to solve.
The embodiment of the invention provides a kind of keepalive method of address repeat listing, comprising:
Proxy service device is according to IP head and the Ethernet header of searching routing table IP head that obtains and the Ethernet header structure keep-alive message of searching the acquisition of ARP table;
Described proxy service device judges whether to have set in advance described keep-alive content of message, if be provided with described content, described content is inserted the message content part of described keep-alive message,, then HELLO information is inserted the message content part of described keep-alive message if described content is not set;
Described proxy service device is constructed the datagram protocol head and the datagram protocol data of described keep-alive message, and wherein, described datagram protocol data comprise described keep-alive message content part;
Described proxy service device is with the synthetic described keep-alive message of IP head, Ethernet header, datagram protocol head and the datagram protocol data set of described keep-alive message;
Described proxy service device sends described keep-alive message to the equipment with network address translation function;
After described equipment with network address translation function is received described keep-alive message, will with the ageing time reclocking of the address repeat listing of described keep-alive message address coupling.
The embodiment of the invention provides a kind of keep-alive system of address repeat listing, comprises equipment and proxy service device with network address translation function,
Described proxy service device is used for according to searching routing table the IP head that obtains and IP head and the Ethernet header with big head structure keep-alive message of searching the acquisition of ARP table; Judge whether to have set in advance described keep-alive content of message, if be provided with described content, described content is inserted the message content part of described keep-alive message,, then HELLO information is inserted the message content part of described keep-alive message if described content is not set; Construct the datagram protocol head and the datagram protocol data of described keep-alive message, wherein, described datagram protocol data comprise described keep-alive message content part; With the synthetic described keep-alive message of IP head, Ethernet header, datagram protocol head and the datagram protocol data set of described keep-alive message; Send described keep-alive message to described equipment with network address translation function;
Described equipment with network address translation function is used to receive described keep-alive message, and will with the ageing time reclocking of the address repeat listing of described keep-alive message address coupling.
Compared with prior art, the embodiment of the invention has the following advantages:
The present invention is to the call business among the NGN; by sending the keep-alive message; refresh the corresponding address forwarding-table item on the equipment with network address translation function, and then solved session on the proxy service device and exist but have the problem that does not have the corresponding address forwarding-table item on the equipment of network address translation function.
Description of drawings
Fig. 1 is a NGN network structure in the prior art;
Fig. 2 is the NGN network structure that has NAT device in the prior art;
Fig. 3 is the NGN network structure that has proxy service device in the prior art;
Fig. 4 is the keepalive method flow chart of a kind of address repeat listing of providing of the embodiment of the invention;
Fig. 5 is that proxy service device is provided with keep-alive message flow chart in the embodiment of the invention;
Fig. 6 is keep-alive message structure figure in the embodiment of the invention;
Fig. 7 is another embodiment of the present invention schematic diagram;
Fig. 8 is the rough schematic view of above-mentioned another embodiment of the present invention;
Fig. 9 is the keep-alive system construction drawing of a kind of address repeat listing of providing of the embodiment of the invention;
Figure 10 is a message generation unit structure chart in the embodiment of the invention.
Embodiment
Software corresponding in the embodiments of the invention can be stored in the computer read/write memory medium.
The embodiment of the invention is carried out keepalive mechanism on proxy service device; regularly send Keep-Alive (keep-alive) message to NAT device/fire compartment wall; thereby regularly remove to refresh the address repeat listing on the NAT/ firewall box; when guaranteeing to have session between NAT/ firewall box and the proxy service device, the address repeat listing on the NAT/ fire compartment wall can be by aging.
The embodiment of the invention provides a kind of keepalive method of address repeat listing, as shown in Figure 4, may further comprise the steps:
Step s401, proxy service device sends the keep-alive message to the equipment with network address translation function.Generally speaking, the refresh cycle of address repeat listing aging mechanism is about 30 seconds, and the time interval that the keep-alive message sends should be less than the refresh cycle of ageing time.
Step s402; after equipment with network address translation function is received the keep-alive message; by resolving IP head, Ethernet header and UDP (datagram protocol) head that obtains this keep-alive message; judge the address repeat listing that whether has in the equipment with network address translation function with these identification information couplings, wherein matching addresses is: source IP address, purpose IP address, source port number and destination slogan coupling.If have, the then ageing time reclocking of this address repeat listing, for example, ageing time is received the keep-alive message during timing to 2.5 second, then ageing time is since 0 reclocking; If no, then this keep-alive message is not processed.In addition,, then this message extraction is gone out, carry out respective handling if carry the message that proxy service device sends to the equipment with network address translation function in the keep-alive content of message.
Before step s401, proxy service device is provided with the keep-alive message, and source port number in the keep-alive message and destination slogan are respectively the port numbers of proxy service device and the equipment end slogan with network address translation function; Source IP address in the keep-alive message and purpose IP address are respectively proxy service device and have the IP address of the equipment of network address translation function.
As shown in Figure 5, be that proxy service device is provided with keep-alive message flow chart in the embodiment of the invention.The process that the keep-alive message is set is as follows:
Search the destination address IP head that routing table obtains the keep-alive message, search ARP (Address Resolution Protocol, address resolution protocol) table obtains the Ethernet header of purpose MAC (MediumAccess Control, medium access control) address; IP head and Ethernet header according to IP head and Ethernet header structure keep-alive message; Judge whether to have set in advance the keep-alive content of message, for example to the alarm indication information of subordinate equipment, or out of Memory; If disposed message content,,, then insert HELLO information if there is not the configuration message content this message content being inserted the message content part of this keep-alive message; The UDP head and the UDP message of structure keep-alive message, wherein, the keep-alive message content is in UDP message; And then finish the setting of keep-alive message.
Fig. 6 is keep-alive message structure figure in the embodiment of the invention, and the keep-alive message comprises the Ethernet header of 4 bytes, the IP head of 20 bytes, the UDP head of 8 bytes and the UDP message of any byte.Wherein, the IP head specifically comprises: the IP verification of the time-to-live of the ID of the differentiated services code points of the version of 1 byte and length, 1 byte, the total length of 2 bytes, 2 bytes, the burst sign of 2 bytes and side-play amount, 1 byte, the protocol number of 1 byte, 2 bytes and, the source IP address of 4 bytes and the purpose IP address of 4 bytes; The UDP head specifically comprises: the verification of 2 byte source ports, 2 byte destination interfaces, 2 byte lengths and 2 bytes and.
When not having session between the equipment that prevents to have network address translation function and the proxy service device, be provided with or send the wasting of resources that the keep-alive message brings, also comprise before the step s401: whether having source IP address and purpose IP address in the proxy service device detection proxy service device is respectively IP address of equipment and the proxy service device IP address with network address translation function; Source port number and destination slogan are respectively to have the equipment end slogan of network address translation function and the forwarding-table item of proxy service device port numbers, if there is this address repeat listing, then proof has session to exist, and just can carry out the setting or the transmission of keep-alive message.
The embodiment of the invention is to the call business in the equipment with network address translation function; by sending the keep-alive message; refresh the corresponding address forwarding-table item on the equipment with network address translation function; assurance has when session exists on the equipment of network address translation function, has on the equipment of network address translation function to have the corresponding address forwarding-table item.In addition, the equipment with network address translation function in the embodiment of the invention both can be NAT device, also can be firewall box.
Another embodiment of the present invention as shown in Figure 7, on behalf of proxy service device receiver address, C, address, the B of address, the A representative that I represents IAD after through the NAT conversion represent proxy service device transmission address, D to represent the soft switch address.Router in the middle of supposing to ignore, C and D are at the same network segment, and A and B are at the same network segment.Fig. 7 is simplified: I, A, B, C, D represent the IP address of each equipment respectively, and PortI, Port A, Port B, Port C, Port D represent corresponding ports, the address translation process that message experienced of sending and receiving from terminal IAD, as shown in Figure 8:
For the message that sends from IAD: on NAT, the source IP and the source port of message are changed, set up following list item:
I：Port?I-＞B：Port?B＝＝＞A：Port?A-＞B：Port?B (1)
On proxy service device, source IP, source port, purpose IP and the destination interface of message are all changed, and these key values have been done record, set up following list item:
A：Port?A-＞B：Port?B＝＝＞C：Port?C-＞D：Port?D (2)
The message of beaming back from the soft switch side returns according to incoming road: on proxy service device source IP, source port, purpose IP and the destination interface of message are all changed, and these key values have been done record, set up following list item:
D：Port?D-＞C：Port?C＝＝＞B：Port?B-＞A：Port?A (3)
On NAT, the source IP and the source port of message are changed, have been set up following list item:
B：Port?B-＞A：Port?A＝＝＞B：Port?B-＞I：Port?I (4)
Because proxy service device is received the message of process NAT with address B, write down address+port numbers of NAT, convert address C to via proxy service device and be transmitted to soft switch D, so, proxy service device can utilize address+port numbers of the NAT of record, be A and Port A, send the Keep-AliVe message to NAT device.If above-mentioned list item (2) exists, illustrate that signaling flow exists, and B to the routing table of A effectively, ARP shows effectively, then sets up following Keep-Alive message flow according to this list item:
D：Port?D-＞C：Port?C＝＝＞B：Port?B-＞A：Port?A (5)
Be actually by proxy service device assembled from A be dealt into B message.The foundation of Keep-Alive message assembling is: the source is the address+port numbers of proxy service device, that is: B and Port B; Purpose is the address+port numbers of NAT device, that is: A and Port A; Its keep-alive be the registered user of D:Port D-＞this list item correspondence of C:Port C, like this, utilize such message just can keep-alive to live address repeat listing on the NAT device.
The embodiment of the invention provides a kind of keep-alive system of address repeat listing, as shown in Figure 9, comprises equipment 100 and proxy service device 200 with network address translation function.Wherein, proxy service device 200 is used to send the keep-alive message to the equipment 100 with network address translation function; Equipment 100 with network address translation function is used to receive the keep-alive message; and will with the ageing time reclocking of the address repeat listing of keep-alive message address coupling, wherein matching addresses is: source IP address, purpose IP address, source port number and destination slogan coupling.
Proxy service device also comprises and detects timer units 204, is used for triggering forwarding-table item detecting unit 202 when overtime and detects.
Keep-alive message generation unit 201 further comprises: the IP head is provided with subelement 2011, Ethernet header is provided with subelement 2012, message content adding subelement 2013 and UDP subelement 2014 is set, as shown in figure 10.Wherein, the IP head is provided with subelement 2011 by searching the IP head that routing table obtains the keep-alive message; Ethernet header is provided with subelement 2012 by searching the Ethernet header that the ARP table obtains the keep-alive message; Message content adds subelement 2013 and adds the keep-alive message content, and message content is HELLO or pre-configured information; UDP is provided with UDP head and the UDP message that subelement 2014 is provided with the keep-alive message, wherein, and storage keep-alive message content in the UDP message.
In the keep-alive system embodiment of address repeat listing of the present invention to the call business among the NGN; by sending the keep-alive message; refresh the corresponding address forwarding-table item on the equipment with network address translation function; assurance has when session exists on the equipment of network address translation function, has on the equipment of network address translation function to have the corresponding address forwarding-table item.In addition, the equipment with network address translation function in the embodiment of the invention both can be NAT device, also can be firewall box.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (10)
1, a kind of keepalive method of address repeat listing is characterized in that, may further comprise the steps:
Proxy service device is according to IP head and the Ethernet header of searching routing table IP head that obtains and the Ethernet header structure keep-alive message of searching the acquisition of ARP table;
Described proxy service device judges whether to have set in advance described keep-alive content of message, if be provided with described content, described content is inserted the message content part of described keep-alive message,, then HELLO information is inserted the message content part of described keep-alive message if described content is not set;
Described proxy service device is constructed the datagram protocol head and the datagram protocol data of described keep-alive message, and wherein, described datagram protocol data comprise described keep-alive message content part;
Described proxy service device is with the synthetic described keep-alive message of IP head, Ethernet header, datagram protocol head and the datagram protocol data set of described keep-alive message;
Described proxy service device sends described keep-alive message to the equipment with network address translation function;
After described equipment with network address translation function is received described keep-alive message, will with the ageing time reclocking of the address repeat listing of described keep-alive message address coupling.
2, the keepalive method of address repeat listing according to claim 1 is characterized in that, described proxy service device also comprises before sending the keep-alive message:
Described proxy service device detects determines that it is respectively IP address of equipment and the proxy service device IP address with network address translation function that described proxy service device exists source IP address and purpose IP address; Source port number and destination slogan are respectively to have the equipment end slogan of network address translation function and the forwarding-table item of proxy service device port numbers.
3, the keepalive method of address repeat listing according to claim 1 is characterized in that, the time interval that described keep-alive message sends is less than described ageing time.
4, the keepalive method of address repeat listing according to claim 1, it is characterized in that source port number in the datagram protocol head in the described keep-alive message and destination slogan are respectively the port numbers of proxy service device and the equipment end slogan with network address translation function; Source IP address in the IP head in the described keep-alive message and purpose IP address are respectively proxy service device and have the IP address of the equipment of network address translation function.
5, a kind of keep-alive system of address repeat listing comprises equipment and proxy service device with network address translation function, it is characterized in that,
Described proxy service device is used for according to IP head and the Ethernet header of searching routing table IP head that obtains and the Ethernet header structure keep-alive message of searching the acquisition of ARP table; Judge whether to have set in advance described keep-alive content of message, if be provided with described content, described content is inserted the message content part of described keep-alive message,, then HELLO information is inserted the message content part of described keep-alive message if described content is not set; Construct the datagram protocol head and the datagram protocol data of described keep-alive message, wherein, described datagram protocol data comprise described keep-alive message content part; With the synthetic described keep-alive message of IP head, Ethernet header, datagram protocol head and the datagram protocol data set of described keep-alive message; Send described keep-alive message to described equipment with network address translation function;
Described equipment with network address translation function is used to receive described keep-alive message, and will with the ageing time reclocking of the address repeat listing of described keep-alive message address coupling.
6, as the keep-alive system of address repeat listing as described in the claim 5, it is characterized in that described proxy service device comprises:
The forwarding-table item detecting unit, being used to detect described proxy service device, whether to have source IP address and purpose IP address be respectively IP address of equipment and the proxy service device IP address with network address translation function; Source port number and destination slogan are respectively to have the equipment end slogan of network address translation function and the forwarding-table item of proxy service device port numbers, and notify described keep-alive packet sending unit to send described keep-alive message when existing;
The keep-alive packet sending unit is used for sending the keep-alive message to described equipment with network address translation function.
7, as the keep-alive system of address repeat listing as described in the claim 6, it is characterized in that described proxy service device also comprises:
Keep-alive message generation unit is used to be provided with described keep-alive message.
8, as the keep-alive system of address repeat listing as described in the claim 7, it is characterized in that described keep-alive message generation unit comprises: the IP head is provided with that subelement, Ethernet header are provided with subelement, message content adds subelement and datagram protocol is provided with subelement;
Described IP head is provided with subelement, by searching the IP head that routing table obtains the keep-alive message;
Described Ethernet header is provided with subelement, by searching the Ethernet header that the ARP table obtains the keep-alive message;
Described message content adds subelement, adds the keep-alive message content;
Described datagram protocol is provided with subelement, and the datagram protocol head and the datagram protocol data of keep-alive message are set.
9, as the keep-alive system of address repeat listing as described in the claim 6, it is characterized in that described proxy service device also comprises:
Detect timer units: be used for triggering described forwarding-table item detecting unit when overtime and detect.
10, as the keep-alive system of address repeat listing as described in the claim 5, it is characterized in that described equipment with network address translation function comprises: matching treatment unit, ageing timer, ageing timer refresh unit and address repeat listing delete cells;
Described matching treatment unit is used for address repeat listing definite and the keep-alive message address coupling that receives;
Described address repeat listing delete cells is used for described ageing timer when overtime, deletes described address repeat listing;
Described ageing timer refresh unit is used for described matching treatment unit and determines to make described ageing timer reclocking when receiving the address repeat listing of keep-alive message address coupling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710006082.0A CN100558081C (en) | 2007-01-29 | 2007-01-29 | The keepalive method of address repeat listing and system |
| PCT/CN2007/070560 WO2008092340A1 (en) | 2007-01-29 | 2007-08-27 | A keep-alive method, system of address forwarding list item and an agent service device |
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| CN200710006082.0A CN100558081C (en) | 2007-01-29 | 2007-01-29 | The keepalive method of address repeat listing and system |
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| CN100558081C true CN100558081C (en) | 2009-11-04 |
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| US9504026B2 (en) * | 2012-12-13 | 2016-11-22 | Nokia Technologies Oy | Keep alive periodicity determination for WiFi networks |
| CN103906037A (en) * | 2012-12-25 | 2014-07-02 | 中兴通讯股份有限公司 | Method and device for completing network address translation keep-alive by adopting port control protocol |
| CN104821899A (en) * | 2015-05-26 | 2015-08-05 | 国网智能电网研究院 | Intelligent device dynamic identification method |
| CN107241453B (en) | 2016-03-28 | 2020-07-24 | 华为技术有限公司 | Network address translation mapping keep-alive method and device |
| CN106973383B (en) * | 2016-08-31 | 2020-06-09 | 上海博达通信科技有限公司 | Distributed portal authentication method |
| CN106656615B (en) * | 2016-12-29 | 2020-03-06 | 杭州迪普科技股份有限公司 | Message processing method and device based on TRACERT command |
| CN109561049B (en) * | 2017-09-26 | 2021-07-20 | 浙江宇视科技有限公司 | Dynamic access method and device based on monitoring service |
| CN109361561A (en) * | 2018-08-23 | 2019-02-19 | 中国联合网络通信集团有限公司 | Heartbeat mechanism keeping method, device and storage medium |
| CN109510882B (en) * | 2018-11-19 | 2022-05-03 | 网易（杭州）网络有限公司 | Communication method and device between game clients, storage medium and electronic device |
| CN109510878B (en) * | 2018-12-24 | 2021-12-24 | 杭州迪普科技股份有限公司 | Long connection session keeping method and device |
| CN111163160A (en) * | 2019-12-27 | 2020-05-15 | 杭州迪普科技股份有限公司 | Keep-alive method and system for session table entry |
| CN113645236B (en) * | 2021-08-10 | 2022-11-29 | 北京天融信网络安全技术有限公司 | Message processing method, device and storage medium |
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| CN1561061A (en) * | 2004-02-27 | 2005-01-05 | Ut斯达康通讯有限公司 | Method for two-way access by NAT |
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| CN100403728C (en) * | 2004-07-30 | 2008-07-16 | 国家数字交换系统工程技术研究中心 | Method for keeping aliver of list item in routing list, and distributing realization system based on multicast protocol of router |
| US8949391B2 (en) * | 2004-08-04 | 2015-02-03 | Rockstar Consortium Us Lp | Network management across a NAT or firewall |
| CN100493033C (en) * | 2005-07-05 | 2009-05-27 | 华为技术有限公司 | Method for passing through network address conversion |
| CN1946062A (en) * | 2006-10-10 | 2007-04-11 | 华为数字技术有限公司 | Method and system for keep-alive conversation table in NAT device |
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2007
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| CN1561061A (en) * | 2004-02-27 | 2005-01-05 | Ut斯达康通讯有限公司 | Method for two-way access by NAT |
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| CN101026567A (en) | 2007-08-29 |
| WO2008092340A1 (en) | 2008-08-07 |
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