CN102724194A - Method and device for sending precision-time synchronous protocol message - Google Patents
Method and device for sending precision-time synchronous protocol message Download PDFInfo
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- CN102724194A CN102724194A CN2012102048078A CN201210204807A CN102724194A CN 102724194 A CN102724194 A CN 102724194A CN 2012102048078 A CN2012102048078 A CN 2012102048078A CN 201210204807 A CN201210204807 A CN 201210204807A CN 102724194 A CN102724194 A CN 102724194A
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Abstract
The invention provides a method and a device for sending a precision-time synchronous protocol message. The method comprises the steps as follows: according to the flag information of a port for sending a PTP message to be sent, judging if the flag information of the port is contained in a self-saved mapping list; if the flag information of the port is ensured to be contained in the self-saved mapping list, sending the PTP message to be sent according to a transmission protocol corresponding to the the flag information of the port in the mapping list; and if not, sending the PTP message to be sent according to a self transmission protocol. According to the invention, because the mapping list for corresponding relations of the flag information of the port and the transmission protocol is established, the corresponding transmission protocol can be found according to the flag information of different ports, and the PTP message can be sent according to the found transmission protocol. As a result, the PTP message can be transmitted between network equipment capable of supporting different transmission protocols, thereby improving the efficiency and ensuring the best transmission effect.
Description
Technical field
The present invention relates to the EPA technical field, relate in particular to a kind of exact time synchronization agreement (Precision Time Synchronization Protocol, PTP) sending method of message and device.
Background technology
The high speed development of ethernet technology is that distributed system has been created condition in the extensive use of industrial circle.Ethernet has advantages such as cost is low, reliability is high, transmission speed is fast, highly versatile, opening is good, development potentiality is big.But also there are defectives such as certainty, the real-time of network are not strong in Ethernet.Along with system's bulky complex day by day; The distribution degree is increasingly high; Requirement to clock synchronization also progressively improves; Though along with the starshaped net topology etc. of improving constantly and adopt of bandwidth reduces the possible The Application of Technology of conflict, certainty, the real-time of Ethernet are improved to some extent, but still can not satisfy the requirement of accurate timing.
The precision interval clock synchronous protocol standard IEEE 1588 of network measure and control system is applicable to the precise time measurement of Ethernet.The basic function of IEEE 1588 is to make that all keep synchronous from clock and master clock in the distributed network; A kind of Precision Time Protocol PTP of this standard definition, it is synchronous to be used for adopting clock in transducer, actuator and the other-end equipment of distributed bus system of multicasting technologies to carry out the microsecond level to standard ethernet or other.PTP is to localized, networked relatively system, and the metastable environment of subnet or intraware is particularly suitable for the application of distributed system aspect industrial automation.Simultaneously agreement is supported multiple transport protocols, UPD/IPv4 for example, UDP/IPv6, Layer-2 EtherNet etc.
But; In EPA actual sets network process; Every network equipment can be selected the host-host protocol of self in the multiple network host-host protocol that PTP supports; Tend to the phenomenon that causes going out a multiple transport protocols in the network and depositing, thereby make that the host-host protocol of the PTP message in the network is inconsistent, and then can't realize the clock synchronization of LA Management Room.
To there being the problem that can't carry out clock synchronization that causes owing to the network transmission protocol is inconsistent in the prior art; At present main solution is carried out unified regulation to the host-host protocol of every network equipment in the whole network; Yet every network equipment is according to the difference of self configuration and demand; Corresponding again best host-host protocol; Therefore, tend to cause the network equipment can't reach best laser propagation effect through the host-host protocol of every network equipment is unified to be provided with, thereby reduced efficiency of transmission.
Summary of the invention
In view of this; The embodiment of the invention provides a kind of sending, receiving method and device of accurate clock synchronization protocol message; Existingly be provided with through the host-host protocol of every network equipment is unified in order to solve, and the network equipment that causes can't reach the problem of best transmission effect.
The invention provides a kind of accurate clock synchronization protocol file transmitting method, this method comprises:
According to the identification information of the port that sends exact time synchronization protocol massages to be sent, judge the identification information that whether comprises said port in the map listing of self preserving;
When in confirming the map listing of self preserving, comprising the identification information of said port, the host-host protocol corresponding according to the identification information of port described in the said map listing sends said exact time synchronization protocol massages to be sent;
When in confirming the map listing of self preserving, not comprising the identification information of said port, send said exact time synchronization protocol massages to be sent according to self host-host protocol.
The present invention also provides a kind of dispensing device of exact time synchronization protocol massages, it is characterized in that, said dispensing device comprises:
Judge module is used for the identification information according to the port that sends exact time synchronization protocol massages to be sent, judges the identification information that whether comprises said port in the map listing of self preserving;
First sending module is used for when confirming that the map listing of self preserving comprises the identification information of said port, and the host-host protocol corresponding according to the identification information of port described in the said map listing sends said exact time synchronization protocol massages to be sent;
Second sending module is used for when confirming that the map listing of self preserving does not comprise the identification information of said port, sends said exact time synchronization protocol massages to be sent according to self host-host protocol.
The embodiment of the invention provides a kind of sending method and device of PTP message, and this method is judged the identification information that whether comprises said port in the map listing of self preserving according to the identification information of the port that sends PTP message to be sent; When in confirming the map listing of self preserving, comprising the identification information of said port, the host-host protocol corresponding according to the identification information of port described in the said map listing sends said PTP message to be sent; When in confirming the map listing of self preserving, not comprising the identification information of said port, send said PTP message to be sent according to self host-host protocol.Identification information and the map listing of host-host protocol corresponding relation of the present invention through setting up port; Make when sending the PTP message; Only need to search corresponding host-host protocol, and send this PTP message, realized that therefore the PTP message transmits at the LA Management Room of supporting differing transmission protocols according to the host-host protocol that finds according to the identification information of the port that sends this PTP message; Thereby improved efficient, guaranteed best laser propagation effect.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes a part of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, does not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the process of transmitting sketch map of a kind of PTP message provided by the invention;
Fig. 2 is that a kind of map listing based on the PTP file transmitting method provided by the invention is set up and automatic renewal process sketch map;
Fig. 3 is the structural representation of the dispensing device of a kind of PTP message provided by the invention.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, clear,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention is in order to solve the problem that can't realize clock synchronization that causes owing to network equipment host-host protocol is inconsistent in the prior art; Provide a kind of based on PTP file transmitting method and device; Realized that the PTP message transmits at the LA Management Room of supporting differing transmission protocols; Thereby improved efficient, guaranteed best laser propagation effect.。
Below in conjunction with Figure of description, the present invention is elaborated.
Fig. 1 is the process of transmitting sketch map of a kind of PTP message provided by the invention, and this process comprises following step:
S101: the identification information that extracts the port that sends PTP message to be sent.
S102: judge the identification information that whether comprises this target MAC (Media Access Control) address port in the map listing of self preserving, when result of determination when being, carry out step S103, otherwise, carry out step S104.
Concrete; The network equipment is according to the identification information of the port that sends PTP message to be sent; In the map listing of self preserving, search; Whether judgement includes the corresponding mapping relations clauses and subclauses of identification information of this port, the wherein identification information of every in store port of mapping relations clauses and subclauses and the corresponding relation of host-host protocol in this map listing.
Map listing can manually be provided with according to user's needs, also can be that the network equipment generates according to the PTP message that other network equipments that receive send automatically.
S103: the host-host protocol corresponding according to the identification information of this port in the map listing, send this PTP message.
When the identification information of the network equipment according to the port that sends PTP message to be sent; When in the map listing that self preserves, finding the corresponding mapping relations clauses and subclauses of identification information with this port; The host-host protocol that the identification information of this port of preserving in the mapping relations clauses and subclauses that find is corresponding is as the host-host protocol of PTP message to be sent, and sends this PTP message according to this host-host protocol.
S104: the host-host protocol according to self sends this PTP message.
In addition, in order further to improve the allocative efficiency of PTP Message Protocol to be sent, after the network equipment this PTP message of host-host protocol transmission according to self, method also comprises in the present invention:
The identification information of the port of the said exact time synchronization protocol massages to be sent of foundation transmission and the mapping relations of the host-host protocol of self also are saved in the map listing.
Concrete; When the identification information of the network equipment according to the port that sends PTP message to be sent; When in the map listing that self preserves, not finding the corresponding mapping relations clauses and subclauses of identification information with this port; With self host-host protocol as the host-host protocol of PTP message to be sent; Send this PTP message according to this host-host protocol, set up the identification information mapping relations clauses and subclauses corresponding of the port that sends this PTP message then, and should newly-built mapping relations clauses and subclauses be saved in the map listing with the host-host protocol of self.
The network equipment is according to the identification information of the port that comprises in the map listing of self preserving and the corresponding relation of host-host protocol in the present invention; Find the corresponding host-host protocol of identification information of different ports; And carry out the PTP message transmissions through the corresponding host-host protocol of the identification information of the different port searched; Therefore realized under the prerequisite that does not change the self transmission agreement that the PTP message transmits at the LA Management Room of supporting differing transmission protocols; Thereby improved efficient, guaranteed best laser propagation effect.
In addition; The present invention is transmitted at the LA Management Room of supporting differing transmission protocols in order to improve the PTP message, further expands the host-host protocol of support, improves PTP Message Protocol matching efficiency; A kind of foundation and automatic update method of map listing also are provided, have comprised:
The PTP message that other network equipments that parsing receives send; Obtain the host-host protocol of said PTP message, and the mapping relations of host-host protocol of identification information and said PTP message that will receive the port of said PTP message are updated in the map listing of self preserving.
Concrete; The network equipment connects receives the PTP message that other network equipments send; Obtain the host-host protocol of this PTP message through resolving this PTP message; Set up the identification information mapping relations clauses and subclauses corresponding of the port that receives this PTP message, and should newly-built mapping relations clauses and subclauses be saved in the map listing with the host-host protocol of this PTP message.
In addition; Resolve the PTP message that receives in the present invention; Obtain after the host-host protocol of said message, the corresponding relation of the identification information of the port that receives said PTP message and the host-host protocol of said PTP message be updated in the map listing of self preservation and comprise:
According to the identification information of the port that receives said PTP message, judge in the map listing of self preserving whether comprise the identification information of the port of said PTP message;
When the identification information of the port of confirming to comprise said PTP message, adopt the host-host protocol of said PTP message to adjust the corresponding host-host protocol of identification information of said port;
When the identification information of the port of confirming not comprise said PTP message, in said map listing, set up the mapping relations and the preservation of identification information with the host-host protocol of said PTP message of the port that receives said PTP message.
In the present invention when identification information according to the port that receives said PTP message; In the map listing of self preserving, search the identification information of said port; When confirming to comprise the identification information of the port that receives said PTP message, the corresponding host-host protocol of identification information that the host-host protocol of the said PTP view of said employing message is adjusted said port comprises:
Judge whether the corresponding host-host protocol of the identification information of port described in the map listing is consistent with the host-host protocol that said PTP message carries;
When the host-host protocol that carries when corresponding host-host protocol of the identification information of confirming said port and said PTP message is consistent, keep the host-host protocol of identification information correspondence of said port constant;
When the host-host protocol that carries when corresponding host-host protocol of the identification information of confirming said port and said PTP message is inconsistent, the host-host protocol of the identification information correspondence of said port is revised as the host-host protocol that said PTP message carries.
Concrete; The network equipment receives the PTP message that other network equipments send; Obtain the host-host protocol of this PTP message through resolving this PTP message; Identification information according to the port that receives this PTP message is searched in the map listing of self preserving, and judges the mapping relations clauses and subclauses that whether comprise the identification information of the port that receives this PTP message in the map listing of self preserving;
When the mapping relations clauses and subclauses of the identification information of confirming in the map listing that self preserves, to comprise the port that receives this PTP message; Obtain the host-host protocol of preserving in the mapping relations clauses and subclauses of the identification information that comprises the port that receives this PTP message; Judge whether the host-host protocol of preserving in these mapping relations clauses and subclauses is consistent with the host-host protocol of this PTP message; When the host-host protocol of in confirming these mapping relations clauses and subclauses, preserving is consistent with the host-host protocol of this PTP message, keep the corresponding relation in these mapping relations clauses and subclauses constant; Otherwise, the host-host protocol of preserving in these mapping relations clauses and subclauses is revised as the host-host protocol of this PTP message;
When the mapping relations clauses and subclauses of the identification information of confirming in the map listing that self preserves, not comprise the port that receives this PTP message; Set up the identification information mapping relations clauses and subclauses corresponding of the port that receives this PTP message, and should newly-built mapping relations clauses and subclauses be saved in the map listing with the host-host protocol of this PTP message.
Fig. 2 is that a kind of map listing based on the PTP file transmitting method provided by the invention is set up and automatic renewal process sketch map, and this process comprises following step:
S201: receive the PTP message that other network equipments send, obtain the host-host protocol of this PTP message through resolving this PTP message.
S202: according to the identification information of the port that receives said PTP message, judge in the map listing of self preserving, whether comprise the identification information of the port that receives said PTP message, when result of determination when being, carry out step S203, otherwise, carry out step S207.
S203: in the map listing of self preserving, obtain the corresponding host-host protocol of identification information of the port that receives said PTP message.
S204: judge whether the corresponding host-host protocol of the identification information of port described in the map listing consistent with the host-host protocol that said PTP message carries, when result of determination when being, carry out step S205, otherwise, carry out step S206.
S205: when the host-host protocol that carries when corresponding host-host protocol of the identification information of confirming said port and said PTP message is consistent, keep the host-host protocol of identification information correspondence of said port constant.
S206: when the host-host protocol that carries when corresponding host-host protocol of the identification information of confirming said port and said PTP message is inconsistent, the host-host protocol of the identification information correspondence of said port is revised as the host-host protocol that said PTP message carries.
S207: when not comprising the identification information of the port that receives said PTP message, in said map listing, the mapping relations of the identification information of the port of the said PTP message of foundation reception and the host-host protocol of said PTP message are also preserved.
The network equipment is through resolving the PTP message that other network equipment sends in the present invention; Obtain the host-host protocol of this PTP message; The mapping relations of the identification information of the port of this PTP message of foundation reception and the host-host protocol of this PTP message also are saved in the mapping table; Thereby realized the automatic renewal of network equipment map listing; Effectively having solved increases owing to the network equipment in the network or changes the problem that can't carry out normal communication that host-host protocol causes, and has further guaranteed the reliability that the PTP message transmits at the LA Management Room of supporting differing transmission protocols.
Fig. 3 is the dispensing device of a kind of PTP message provided by the invention, and this dispensing device comprises:
First sending module 32 is used for when confirming that the map listing of self preserving comprises the identification information of said port, and the host-host protocol corresponding according to the identification information of port described in the said map listing sends said exact time synchronization protocol massages to be sent;
Second sending module 33 is used for when confirming that the map listing of self preserving does not comprise the identification information of said port, sends said exact time synchronization protocol massages to be sent according to self host-host protocol.
Said dispensing device also comprises:
Said first mapping block 34 specifically is used for the identification information according to the port that receives said exact time synchronization protocol massages, judges in the map listing of self preserving, and whether comprises the identification information of the port that receives said exact time synchronization protocol massages; When comprising the identification information of the port that receives said exact time synchronization protocol massages, adopt the host-host protocol of said exact time synchronization protocol massages to adjust the corresponding host-host protocol of identification information of said port; When not comprising the identification information of the port that receives said exact time synchronization protocol massages; In said map listing, the mapping relations of the identification information of the port of the said exact time synchronization protocol massages of foundation reception and the host-host protocol of said exact time synchronization protocol massages are also preserved.
The said first mapping mould 34 specifically is used to also to judge whether the corresponding host-host protocol of the identification information of port described in the map listing is consistent with the host-host protocol that said exact time synchronization protocol massages carries; When the host-host protocol that carries when corresponding host-host protocol of the identification information of confirming said port and said exact time synchronization protocol massages is consistent, keep the host-host protocol of identification information correspondence of said port constant; When the host-host protocol that carries when corresponding host-host protocol of the identification information of confirming said port and said exact time synchronization protocol massages is inconsistent, the host-host protocol of the identification information correspondence of said port is revised as the host-host protocol that said exact time synchronization protocol massages carries.
Said dispensing device also comprises:
The embodiment of the invention provides a kind of sending method and device of PTP message, and this method is judged the identification information that whether comprises said port in the map listing of self preserving according to the identification information of the port that sends PTP message to be sent; When in confirming the map listing of self preserving, comprising the identification information of said port, the host-host protocol corresponding according to the identification information of port described in the said map listing sends said PTP message to be sent; When in confirming the map listing of self preserving, not comprising the identification information of said port, send said PTP message to be sent according to self host-host protocol.Identification information and the map listing of host-host protocol corresponding relation of the present invention through setting up port; Make when sending the PTP message; Only need to search corresponding host-host protocol, and send this PTP message, realized that therefore the PTP message transmits at the LA Management Room of supporting differing transmission protocols according to the host-host protocol that finds according to the identification information of the port that sends this PTP message; Thereby improved efficient, guaranteed best laser propagation effect.
Above-mentioned explanation illustrates and has described the preferred embodiments of the present invention; But as previously mentioned; Be to be understood that the present invention is not limited to the form that this paper discloses, should do not regard eliminating as, and can be used for various other combinations, modification and environment other embodiment; And can in invention contemplated scope described herein, change through the technology or the knowledge of above-mentioned instruction or association area.And change that those skilled in the art carried out and variation do not break away from the spirit and scope of the present invention, then all should be in the protection range of accompanying claims of the present invention.
Claims (10)
1. exact time synchronization protocol massages sending method is characterized in that said method comprises:
According to the identification information of the port that sends exact time synchronization protocol massages to be sent, judge the identification information that whether comprises said port in the map listing of self preserving;
When in confirming the map listing of self preserving, comprising the identification information of said port, the host-host protocol corresponding according to the identification information of port described in the said map listing sends said exact time synchronization protocol massages to be sent;
When in confirming the map listing of self preserving, not comprising the identification information of said port, send said exact time synchronization protocol massages to be sent according to self host-host protocol.
2. the method for claim 1 is characterized in that, the method for building up of the said map listing of self preserving comprises:
The exact time synchronization protocol massages that other network equipments that parsing receives send; Obtain the host-host protocol of said exact time synchronization protocol massages; And will receive identification information and the mapping relations of said exact time synchronization protocol massages host-host protocol of the port of said exact time synchronization protocol massages, be updated in the map listing of self preserving.
3. method as claimed in claim 2; It is characterized in that; The identification information of the said port that will receive said exact time synchronization protocol massages and the mapping relations of said exact time synchronization protocol massages host-host protocol are updated in the map listing of self preserving and comprise:
According to the identification information of the port that receives said exact time synchronization protocol massages, judge in the map listing of self preserving whether comprise the identification information of said port;
When confirming to comprise the identification information of said port, adopt the host-host protocol of said exact time synchronization protocol massages to adjust the corresponding host-host protocol of identification information of said port;
When confirming not comprise the identification information of said port, in said map listing, set up the mapping relations and the preservation of identification information with the host-host protocol of said exact time synchronization protocol massages of said port.
4. method as claimed in claim 3 is characterized in that, the corresponding host-host protocol of identification information that the host-host protocol of the said exact time synchronization protocol massages of said employing is adjusted said port comprises:
Judge whether the corresponding host-host protocol of the identification information of port described in the map listing is consistent with the host-host protocol that said exact time synchronization protocol massages carries;
When the host-host protocol that carries when corresponding host-host protocol of the identification information of confirming said port and said exact time synchronization protocol massages is consistent, keep the host-host protocol of identification information correspondence of said port constant;
When the host-host protocol that carries when corresponding host-host protocol of the identification information of confirming said port and said exact time synchronization protocol massages is inconsistent, the host-host protocol of the identification information correspondence of said port is revised as the host-host protocol that said exact time synchronization protocol massages carries.
5. the method for claim 1 is characterized in that, said host-host protocol according to self sends said exact time synchronization protocol massages to be sent, and method also comprises:
The identification information of the port of the said exact time synchronization protocol massages to be sent of foundation transmission and the mapping relations of the host-host protocol of self also are saved in the map listing.
6. the dispensing device of an exact time synchronization protocol massages is characterized in that, said dispensing device comprises:
Judge module is used for the identification information according to the port that sends exact time synchronization protocol massages to be sent, judges the identification information that whether comprises said port in the map listing of self preserving;
First sending module is used for when confirming that the map listing of self preserving comprises the identification information of said port, and the host-host protocol corresponding according to the identification information of port described in the said map listing sends said exact time synchronization protocol massages to be sent;
Second sending module is used for when confirming that the map listing of self preserving does not comprise the identification information of said port, sends said exact time synchronization protocol massages to be sent according to self host-host protocol.
7. device as claimed in claim 6 is characterized in that, said dispensing device also comprises:
First mapping block; Be used to resolve the exact time synchronization protocol massages of other network equipments transmissions that receive; Obtain the host-host protocol of said exact time synchronization protocol massages; And will receive identification information and the mapping relations of said exact time synchronization protocol massages host-host protocol of the port of said exact time synchronization protocol massages, be updated in the map listing of self preserving.
8. device as claimed in claim 7; It is characterized in that; Said first mapping block specifically is used for the identification information according to the port that receives said exact time synchronization protocol massages, judges in the map listing of self preserving, and whether comprises the identification information of said port; When confirming to comprise the identification information of said port, adopt the host-host protocol of said exact time synchronization protocol massages to adjust the corresponding host-host protocol of identification information of said port; When confirming not comprise the identification information of said port, in said map listing, set up the mapping relations and the preservation of identification information with the host-host protocol of said exact time synchronization protocol massages of said port.
9. device as claimed in claim 8 is characterized in that, said first mapping block is used to also specifically to judge whether the corresponding host-host protocol of the identification information of port described in the map listing is consistent with the host-host protocol that said exact time synchronization protocol massages carries; When the host-host protocol that carries when corresponding host-host protocol of the identification information of confirming said port and said exact time synchronization protocol massages is consistent, keep the host-host protocol of identification information correspondence of said port constant; When the host-host protocol that carries when corresponding host-host protocol of the identification information of confirming said port and said exact time synchronization protocol massages is inconsistent, the host-host protocol of the identification information correspondence of said port is revised as the host-host protocol that said exact time synchronization protocol massages carries.
10. device as claimed in claim 6 is characterized in that, said dispensing device also comprises:
Second mapping block, be used for setting up the port that sends said exact time synchronization protocol massages to be sent identification information and the host-host protocol of self mapping relations and be saved to map listing.
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| CN104301373A (en) * | 2013-07-18 | 2015-01-21 | 国际商业机器公司 | Push notification via file sharing service synchronization |
| WO2016110084A1 (en) * | 2015-01-06 | 2016-07-14 | 中兴通讯股份有限公司 | Method, device and system for precision time protocol time synchronization in aggregation network |
| CN105939243A (en) * | 2016-04-14 | 2016-09-14 | 烽火通信科技股份有限公司 | Multi-port PTP (Precision Time Protocol) message processing system |
| CN108833611A (en) * | 2018-08-01 | 2018-11-16 | 中国联合网络通信集团有限公司 | A kind of distribution method of method NAT address conversion |
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| WO2011120262A1 (en) * | 2010-03-31 | 2011-10-06 | 中兴通讯股份有限公司 | Time synchronization processing method and device |
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| CN101820355A (en) * | 2010-01-20 | 2010-09-01 | 瑞斯康达科技发展股份有限公司 | Method for acquiring network topology and network element |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104301373A (en) * | 2013-07-18 | 2015-01-21 | 国际商业机器公司 | Push notification via file sharing service synchronization |
| CN104301373B (en) * | 2013-07-18 | 2018-01-12 | 国际商业机器公司 | Via the synchronous sending out notice of file-sharing service |
| WO2016110084A1 (en) * | 2015-01-06 | 2016-07-14 | 中兴通讯股份有限公司 | Method, device and system for precision time protocol time synchronization in aggregation network |
| CN105939243A (en) * | 2016-04-14 | 2016-09-14 | 烽火通信科技股份有限公司 | Multi-port PTP (Precision Time Protocol) message processing system |
| CN105939243B (en) * | 2016-04-14 | 2019-02-15 | 烽火通信科技股份有限公司 | The processing system of multiport PTP message |
| CN108833611A (en) * | 2018-08-01 | 2018-11-16 | 中国联合网络通信集团有限公司 | A kind of distribution method of method NAT address conversion |
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Application publication date: 20121010 |