CN102045407A - Method and system for inquiring mapping relation and method for sending corresponding data message - Google Patents
Method and system for inquiring mapping relation and method for sending corresponding data message Download PDFInfo
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- CN102045407A CN102045407A CN2009101800179A CN200910180017A CN102045407A CN 102045407 A CN102045407 A CN 102045407A CN 2009101800179 A CN2009101800179 A CN 2009101800179A CN 200910180017 A CN200910180017 A CN 200910180017A CN 102045407 A CN102045407 A CN 102045407A
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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
- H04L61/09—Mapping addresses
- H04L61/10—Mapping addresses of different types
- H04L61/103—Mapping addresses of different types across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
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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
- H04L61/45—Network directories; Name-to-address mapping
- H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
- H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
Abstract
The invention provides a method for inquiring mapping relation, wherein the method is applied to a next generation network which is based on the separation between the identity identification and the position identification of the network, the next generation network comprises a service node of a domain name resolving system (DNS), and the inquiring method comprises sending the domain name of a correspondent node to the service node of the domain name resolving system (DNS) by a terminal via an access node to as to initiate DNS resolving, wherein the service node of the DNS is equipped with an identity identification and a domain name which is corresponded to the identity identification, and then returning the identity identification which is corresponded to the domain name to the access node by the service node of the DNS, and then inquiring the mapping relation between the domain name and the corresponding identity identification of the domain name by the access node. Correspondingly, the invention further provides a system for inquiring mapping relation and a method for sending data message. The method and the system provided by the invention have the advantage that the communication delay is reduced.
Description
Technical field
The present invention relates to the communications field and internet arena, relate in particular to a kind of querying method and system and corresponding data message sending method of mapping relations.
Background technology
Along with the development of information technology, be that the information network of representative has played more and more important effect with the Internet in economy and social development.But the Internet has also in use exposed increasing problem.At the beginning of the Internet design, only considered fixing terminal trusty, the support terminal mobility does not have inherent Security Assurance Mechanism yet.Along with the development of wireless technologys such as 3G, back 3G and 4G, the Internet becomes more and more urgent subject to the support of portable terminal.Simultaneously, along with the expansion of internet, applications scope, safety problem is also more outstanding, and these problems have been difficult to solve under existing Internet technology framework.
(Transmission Control Protocol/Internet Protocol TCP/IP) is the basis of the Internet to transmission control protocol/procotol.The IP address has the double attribute of identity and position, is that ambulant root can't be supported in the Internet.As the identity attribute of terminal, the IP address can not change in the terminal moving process, otherwise TCP and User Datagram Protoco (UDP) (User Datagram Protocol, UDP) etc. upper-layer service connection meeting is interrupted along with the change of IP address; As the position attribution of terminal, the IP address must change (the IP address must have the subnet prefix at current place) in the terminal moving process, otherwise router can't correctly be forwarded to terminal to packet.Simultaneously, the double attribute of IP address also is that the fail safe of the Internet can not get the basic reason place that solves.Because the IP address must comprise the position attribution of terminal,, therefore can't determine assailants' such as hacker identity on the internet according to the IP address so portable terminal can't be assigned to fixed IP addresses.This is the basic reason that safety problems such as attack on the current internet, swindle, abuse can not get solving.
The defective that has double attribute at the IP agreement, industry is at the multiple next generation network technology that separates with station location marker based on identify label of research, as location identity separated protocol (LISP), host identity protocol (Host Identity Protocol, HIP), integrated network and identify label shown in Figure 1 and locator separation network (application number is 200910171975.X, and the applying date is on 09 17th, 2009) or the like.The common feature of these technology is to have introduced two space encoders, the identity of a space encoder GC group connector, and the position of a space encoder GC group connector, i.e. all existing identify label of each terminal has a station location marker again.TCP is connected with upper-layer service such as UDP that the identify label that is based on terminal and opposite end establish a communications link.When terminal moved, its station location marker changed thereupon, but its identify label remains unchanged.Therefore the mobile interruption that can not cause upper-layer service of terminal.
Identify label and station location marker after separating, a problem of bringing are the inquiry problems that needs the mapping relations of solution identify label and station location marker.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of querying method and system and corresponding data message sending method of mapping relations, can reduce because the communication delay that the query script of mapping relations brings.
The next generation network technology that based on network identify label separates with station location marker comprises in LISP, integrated network and identify label and the locator separation network, terminal is only handled identify label, do not handle station location marker, station location marker is handled by access node, only comprise identify label in the packet that terminal is initiated to communicate by letter, edge router need remove to search corresponding station location marker according to this identify label, generally need be to query mappings relation in the mapping server.The search procedure of mapping server generally needs hundreds of millisecond consuming time to several seconds time, and has a lot of inquiries in the network, so can cause bigger communication delay.
In order to reduce the number of times that mapping server is searched, accelerate the packet repeating process, prior art generally is the mapping relations of identify label and station location marker to be kept at this locality as far as possible, such as the buffer memory of in access node, opening up a special use, be used for preserving the identify label of nearest Correspondent Node of visiting and the mapping relations of station location marker, if it is that the packet of destination address sends that the new identify label with nearest Correspondent Node of visiting is arranged, access node just can be accelerated the repeating process of packet greatly as long as search this identify label and the mapping relations of its pairing station location marker in local cache.
But this method can not solve the problem of searching mapping relations fast fully, is necessary to seek a kind of method that can reduce the mapping relations of searching identify label and station location marker of communication delay.
In addition, in actual applications, because the user terminal that communication sometimes and be not easy memory, is initiated in identify label is sometimes and do not know the identify label of Correspondent Node; Secondly, after the terminal of initiating communication was sent packet, access node just began to carry out the mapping relationship searching process of identify label and station location marker, just began communication after node to be accessed finds and can cause communication delay.
(Domain Name System, DNS) server utilize the process of domain name mapping to initiate the mapping relationship searching process of identify label and station location marker in advance, to reduce communication delay by domain name system in the present invention.
In order to address the above problem, the invention provides a kind of querying method of mapping relations, be used for the next generation network that based on network identify label separates with station location marker, comprise a domain name analysis system (DNS) service node in the described next generation network, described querying method comprises:
Terminal is initiated dns resolution by access node to the domain name that domain name analysis system (DNS) service node sends Correspondent Node; Dispose the identify label domain name corresponding on the wherein said DNS service node with this identify label;
Described DNS service node returns the identify label of this domain name correspondence to described access node;
The mapping relations of the identify label of described access node inquiry domain name correspondence.
Further, above-mentioned querying method also has following characteristics:
The next generation network that described based on network identify label separates with station location marker comprises integrated network, the network that location identity separated protocol (LISP) and identify label separate with the position.
Further, above-mentioned querying method also has following characteristics:
Described access node is access switch router (ASR) in described integrated network, being access service node (ASN) in described identify label and locator separation network, is exit tunnel router (ETR) and inlet tunnel router (ITR) in described LISP network.
Further, above-mentioned querying method also has following characteristics:
The mapping relations of the identify label of described access node inquiry domain name correspondence are specially:
Described access node is to the mapping relations of the identify label of mapping node inquiry domain name correspondence.
Further, above-mentioned querying method also has following characteristics:
Preserve the identify label of nearest inquiry and the mapping relations of station location marker on the described access node;
The mapping relations of the identify label of described access node inquiry domain name correspondence are specially:
The mapping relations of the identify label of inquiry domain name correspondence in the described mapping relations that described access node is preserved thereon;
If the mapping relations of the identify label of domain name correspondence are inquired about in inquiry to mapping node less than, described access node.
In order to address the above problem, the present invention also provides a kind of inquiry system of mapping relations, be used for the next generation network that based on network identify label separates with station location marker, described inquiry system comprises terminal, access node and domain name analysis system (DNS) service node; Wherein,
Described terminal is used for sending to described access node the domain name of Correspondent Node, and the identify label that receives the domain name correspondence that described access node returns;
Described access node, be used for domain name is sent to described DNS service node, and after the identify label that receives the domain name correspondence that described DNS service node returns, inquire about the mapping relations of described identify label and station location marker, and the identify label of domain name correspondence is returned to described terminal;
Described DNS service node is used to preserve the identify label domain name corresponding with this identify label, and receives the identify label of searching the domain name correspondence after the domain name that described access node sends, and described identify label is sent to described access node.
Further, above-mentioned inquiry system also has following characteristics:
The next generation network that described based on network identify label separates with station location marker comprises integrated network, the network that location identity separated protocol (LISP) and identify label separate with the position.
Further, above-mentioned inquiry system also has following characteristics:
Described access node is access switch router (ASR) in described integrated network, being access service node (ASN) in described identify label and locator separation network, is exit tunnel router (ETR) and inlet tunnel router (ITR) in described LISP network.
Further, above-mentioned inquiry system also has following characteristics:
Described inquiry system also comprises mapping node;
Described access node also is used for sending to mapping node the identify label of domain name correspondence, and receives and preserve the identify label of the domain name correspondence that described mapping node returns and the mapping relations of station location marker;
Described mapping node, be used for preserving the identify label of described all nodes of next generation network and the mapping relations of station location marker, and the mapping relations that receive inquiry identify label and station location marker after the identify label that described access node sends, and return described mapping relations to described access node.
Further, above-mentioned inquiry system also has following characteristics:
Described inquiry system also comprises mapping node;
Described access node also is used to preserve the identify label of nearest inquiry and the mapping relations of station location marker; The mapping relations of described access node inquiry identify label and station location marker are specially the mapping relations of the identify label of nslookup correspondence in the mapping relations that described access node is preserved thereon; When the mapping relations of searching in the described mapping relations of preserving less than the identify label of domain name correspondence, send the identify label of domain name correspondence to described mapping node thereon.
In order to address the above problem, the present invention also provides a kind of sending method of data message, be used for the next generation network that based on network identify label separates with station location marker, comprise a domain name analysis system (DNS) service node in the described next generation network, described sending method comprises:
Terminal is initiated dns resolution by access node to the domain name that domain name analysis system (DNS) service node sends Correspondent Node; Dispose the identify label domain name corresponding on the wherein said DNS service node with this identify label;
Described DNS service node returns the identify label of this domain name correspondence to described access node;
The mapping relations of described access node inquiry identify label and station location marker return to described terminal with described identify label;
The described identify label that described terminal utilization receives sends datagram to Correspondent Node.
Further, above-mentioned sending method also has following characteristics:
The next generation network that described based on network identify label separates with station location marker comprises integrated network, the network that location identity separated protocol (LISP) and identify label separate with the position.
Further, above-mentioned sending method also has following characteristics:
Described access node is access switch router (ASR) in described integrated network, being access service node (ASN) in described identify label and locator separation network, is exit tunnel router (ETR) and inlet tunnel router (ITR) in described LISP network.
Further, above-mentioned sending method also has following characteristics:
The mapping relations of the identify label of described access node inquiry domain name correspondence are specially:
Described access node is to the mapping relations of the identify label of mapping node inquiry domain name correspondence.
Further, above-mentioned sending method also has following characteristics:
Preserve the identify label of nearest inquiry and the mapping relations of station location marker on the described access node;
The mapping relations of the identify label of described access node inquiry domain name correspondence are specially:
The mapping relations of the identify label of inquiry domain name correspondence in the described mapping relations that described access node is preserved thereon;
If the mapping relations of the identify label of domain name correspondence are inquired about in inquiry to mapping node less than, described access node.
By said method and system, access node is known the identify label of the communication object that terminal will be initiated in advance, and is begun to inquire about the station location marker of this identify label correspondence in advance by detecting DNS message, these mapping relations are kept at local cache, thereby have reduced communication delay.In one embodiment, when terminal was initiated communication, access node did not need to go the mapping server inquiry as long as just can find mapping relations in this locality again, has shortened communication delay.
Description of drawings
Fig. 1 is the schematic diagram of identify label and locator separation network;
Fig. 2 is that the present invention uses and utilizes DNS message to shift to an earlier date the flow chart of query mappings relation in the example.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with accompanying drawing.
In the present embodiment, be used for the next generation network that based on network identify label separates with station location marker, comprise a DNS service node in this next generation network, be used to each node distribution domain name in the network, and preserve the identify label domain name corresponding with this identify label;
Wherein, the next generation network that this based on network identify label separates with station location marker can be an integrated network, the network that LISP network and identify label separate with the position;
The DNS service node can be a special dns server, certain network node that has the dns resolution function in can certainly network.
The method of present embodiment specifically comprises the steps:
(1) terminal is initiated dns resolution by access node to the domain name that the DNS service node sends Correspondent Node;
(2) after the DNS service node inquires the identify label of domain name correspondence of Correspondent Node, return this identify label to access node;
Wherein, access node is used for the conversion of the mapping relations of identify label and station location marker; In integrated network,, in the identity locator separation network, be ASN (Access Service Node, access service node) for ASR (Access Switch Router inserts switch router); In the LISP network, be ETR (Egress Tunnel Router, exit tunnel router) and ITR (Ingress TunnelRouter, inlet tunnel router);
(3) after access node is received the identify label that the DNS service node returns, the mapping relations that begin to inquire about this identify label;
Access node also will return to terminal from the identify label that the DNS service node is received;
Wherein, access node can also return to terminal with this identify label simultaneously when beginning to inquire about the mapping relations of this identify label; To terminal return data message, can certainly be that other times return identify label to terminal after also can inquiring.
In a preferred embodiment, preserve the identify label of nearest inquiry and the mapping relations of station location marker in the access node, after access node is received the identify label that the DNS service node returns, in the mapping relations of identify label of preserving and station location marker, search whether there is this identify label;
If exist, the query script of the mapping relations of identify label and station location marker finishes;
If there is no, the mapping relations of access node inquiry this identify label and station location marker in the mapping service node, and the identify label that preservation is inquired and the mapping relations of station location marker;
Wherein, preserve the identify label of each node in the network and the mapping relations of station location marker in the mapping service node.
In another embodiment, access node also can be directly in the mapping node mapping relations of inquiry identify label and station location marker.
In the present embodiment, access node detects the dns resolution process, after detecting the identify label that the DNS service node returns, initiates the query script of the mapping relations of identify label and station location marker in advance, thereby has shortened communication delay.
In this step, access node utilized the identify label that obtains in the process of domain name mapping to initiate the mapping relationship searching process of identify label and station location marker in advance, thereby has realized the minimizing communication delay before terminal is initiated communication.
Terminal can be initiated communication to Correspondent Node after receiving the identify label of Correspondent Node, and before terminal is initiated communication, access node has begun to carry out the query script of the mapping relations of identify label and station location marker, has therefore reduced because the communication delay that the query script of mapping relations brings.
Figure 2 shows that the present invention uses utilizes DNS message to shift to an earlier date the flow chart of query mappings relation in the example, should describe based on identify label and locator separation network with example.Wherein, in identify label and locator separation network, access node is an edge router, is called mapping server again;
The method of this example specifically comprises the steps:
Step 210: when terminal is initiated communication, at first send the DNS query messages to dns server, wherein comprise the domain name of Correspondent Node by edge router;
Step 220:DNS whois lookup returns DNS response message by edge router to terminal to the identify label of this domain name correspondence, wherein comprises the domain name of terminal request inquiry and the identify label of this domain name correspondence; After edge router detects this DNS response message, obtain the identify label that wherein comprises (this identify label promptly is the identify label of the terminal communication object that will initiate to communicate by letter).
Step 210 and step 220 are a dns resolution process, finish by DNS inquiry and two message of DNS response, when terminal is initiated communication, send a DNS query messages to dns server earlier, wherein comprise the domain name that needs are resolved, after dns server is received this message, search the identify label (perhaps IP address) of the communication terminal of this domain name correspondence, send the DNS response message to terminal then, wherein comprise the identify label that inquires.
Step 230: edge router is searched the mapping relations that whether have this identify label in local cache; If exist, illustrate that then Edge Server does not need to go to search mapping relations again, flow process finishes; If there is no, edge router is sent out the map locating request message to mapping server;
Step 250: mapping server returns the identify label and the station location marker mapping relations of this identify label, and edge router is kept at these mapping relations in the local cache, and flow process finishes.
Correspondingly, present embodiment also provides a kind of inquiry system of realizing the querying method of above-mentioned mapping relations, be used for the next generation network that based on network identify label separates with station location marker, comprise terminal, access node and domain name analysis system (DNS) service node; Wherein,
Terminal is used for sending to access node the domain name of Correspondent Node, and the identify label that receives the domain name correspondence that access node returns;
Access node is used for domain name is sent to the DNS service node, and after the identify label that receives the domain name correspondence that the DNS service node returns, the mapping relations of inquiry identify label and station location marker, and the identify label of domain name correspondence returned to terminal;
The DNS service node is used to preserve the identify label domain name corresponding with this identify label, and receives the identify label of searching the domain name correspondence after the domain name that access node sends, and identify label is sent to access node.
Wherein, inquiry system also comprises mapping node;
Access node sends the identify label of domain name correspondence to mapping node, and receives and preserve the identify label of the domain name correspondence that described mapping node returns and the mapping relations of station location marker;
Mapping node, be used for preserving the identify label of all nodes of next generation network and the mapping relations of station location marker, and the mapping relations that receive inquiry identify label and station location marker after the identify label that access node sends, and return described mapping relations to access node.
Wherein, access node also is used to preserve the identify label of nearest inquiry and the mapping relations of station location marker; The mapping relations of described access node inquiry identify label and station location marker are specially the mapping relations of the identify label of nslookup correspondence in the mapping relations that described access node is preserved thereon; When the mapping relations of searching in the described mapping relations of preserving less than the identify label of domain name correspondence, send the identify label of domain name correspondence to described mapping node thereon.
Claims (15)
1. the querying method of mapping relations is used for the next generation network that based on network identify label separates with station location marker, it is characterized in that, comprises a domain name analysis system (DNS) service node in the described next generation network, and described querying method comprises:
Terminal is initiated dns resolution by access node to the domain name that domain name analysis system (DNS) service node sends Correspondent Node; Dispose the identify label domain name corresponding on the wherein said DNS service node with this identify label;
Described DNS service node returns the identify label of this domain name correspondence to described access node;
The mapping relations of the identify label of described access node inquiry domain name correspondence.
2. querying method as claimed in claim 1 is characterized in that:
The next generation network that described based on network identify label separates with station location marker comprises integrated network, the network that location identity separated protocol (LISP) and identify label separate with the position.
3. querying method as claimed in claim 2 is characterized in that:
Described access node is access switch router (ASR) in described integrated network, being access service node (ASN) in described identify label and locator separation network, is exit tunnel router (ETR) and inlet tunnel router (ITR) in described LISP network.
4. as claim 1 or 2 or 3 described querying methods, it is characterized in that the mapping relations of the identify label of described access node inquiry domain name correspondence are specially:
Described access node is to the mapping relations of the identify label of mapping node inquiry domain name correspondence.
5. querying method as claimed in claim 4 is characterized in that:
Preserve the identify label of nearest inquiry and the mapping relations of station location marker on the described access node;
The mapping relations of the identify label of described access node inquiry domain name correspondence are specially:
The mapping relations of the identify label of inquiry domain name correspondence in the described mapping relations that described access node is preserved thereon;
If the mapping relations of the identify label of domain name correspondence are inquired about in inquiry to mapping node less than, described access node.
6. the inquiry system of mapping relations is used for the next generation network that based on network identify label separates with station location marker, it is characterized in that, described inquiry system comprises terminal, access node and domain name analysis system (DNS) service node; Wherein,
Described terminal is used for sending to described access node the domain name of Correspondent Node, and the identify label that receives the domain name correspondence that described access node returns;
Described access node, be used for domain name is sent to described DNS service node, and after the identify label that receives the domain name correspondence that described DNS service node returns, inquire about the mapping relations of described identify label and station location marker, and the identify label of domain name correspondence is returned to described terminal;
Described DNS service node is used to preserve the identify label domain name corresponding with this identify label, and receives the identify label of searching the domain name correspondence after the domain name that described access node sends, and described identify label is sent to described access node.
7. inquiry system as claimed in claim 6 is characterized in that:
The next generation network that described based on network identify label separates with station location marker comprises integrated network, the network that location identity separated protocol (LISP) and identify label separate with the position.
8. inquiry system as claimed in claim 7 is characterized in that:
Described access node is access switch router (ASR) in described integrated network, being access service node (ASN) in described identify label and locator separation network, is exit tunnel router (ETR) and inlet tunnel router (ITR) in described LISP network.
9. as claim 6 or 7 or 8 described inquiry systems, it is characterized in that described inquiry system also comprises mapping node;
Described access node also is used for sending to mapping node the identify label of domain name correspondence, and receives and preserve the identify label of the domain name correspondence that described mapping node returns and the mapping relations of station location marker;
Described mapping node, be used for preserving the identify label of described all nodes of next generation network and the mapping relations of station location marker, and the mapping relations that receive inquiry identify label and station location marker after the identify label that described access node sends, and return described mapping relations to described access node.
10. inquiry system as claimed in claim 9 is characterized in that described inquiry system also comprises mapping node;
Described access node also is used to preserve the identify label of nearest inquiry and the mapping relations of station location marker; The mapping relations of described access node inquiry identify label and station location marker are specially the mapping relations of the identify label of nslookup correspondence in the mapping relations that described access node is preserved thereon; When the mapping relations of searching in the described mapping relations of preserving less than the identify label of domain name correspondence, send the identify label of domain name correspondence to described mapping node thereon.
11. the sending method of a data message is used for the next generation network that based on network identify label separates with station location marker, it is characterized in that, comprises a domain name analysis system (DNS) service node in the described next generation network, described sending method comprises:
Terminal is initiated dns resolution by access node to the domain name that domain name analysis system (DNS) service node sends Correspondent Node; Dispose the identify label domain name corresponding on the wherein said DNS service node with this identify label;
Described DNS service node returns the identify label of this domain name correspondence to described access node;
The mapping relations of described access node inquiry identify label and station location marker return to described terminal with described identify label;
The described identify label that described terminal utilization receives sends datagram to Correspondent Node.
12. sending method as claimed in claim 11 is characterized in that:
The next generation network that described based on network identify label separates with station location marker comprises integrated network, the network that location identity separated protocol (LISP) and identify label separate with the position.
13. sending method as claimed in claim 12 is characterized in that:
Described access node is access switch router (ASR) in described integrated network, being access service node (ASN) in described identify label and locator separation network, is exit tunnel router (ETR) and inlet tunnel router (ITR) in described LISP network.
14., it is characterized in that the mapping relations of the identify label of described access node inquiry domain name correspondence are specially as claim 11 or 12 or 13 described sending methods:
Described access node is to the mapping relations of the identify label of mapping node inquiry domain name correspondence.
15. sending method as claimed in claim 14 is characterized in that:
Preserve the identify label of nearest inquiry and the mapping relations of station location marker on the described access node;
The mapping relations of the identify label of described access node inquiry domain name correspondence are specially:
The mapping relations of the identify label of inquiry domain name correspondence in the described mapping relations that described access node is preserved thereon;
If the mapping relations of the identify label of domain name correspondence are inquired about in inquiry to mapping node less than, described access node.
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| CN2009101800179A CN102045407A (en) | 2009-10-22 | 2009-10-22 | Method and system for inquiring mapping relation and method for sending corresponding data message |
| PCT/CN2010/077833 WO2011047614A1 (en) | 2009-10-22 | 2010-10-18 | Method and system for querying mapping relationship and corresponding method for sending data message |
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|---|---|---|---|---|
| CN103095580A (en) * | 2011-10-27 | 2013-05-08 | 中兴通讯股份有限公司 | Location information query method, policy server, location server and system |
| CN105516389A (en) * | 2015-12-23 | 2016-04-20 | 郑州悉知信息科技股份有限公司 | Method and device for modifying domain name and IP mapping relation |
| CN105516389B (en) * | 2015-12-23 | 2019-01-08 | 郑州悉知信息科技股份有限公司 | The amending method and device of domain name and IP mapping relations |
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| Publication number | Publication date |
|---|---|
| WO2011047614A1 (en) | 2011-04-28 |
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