CN102780776A - Method and device for discovering application layer transmission optimization server - Google Patents
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Abstract
Translated fromChinese
Description
Translated fromChinese技术领域technical field
本发明涉及通信领域，具体而言，涉及一种应用层传输优化服务器发现方法及装置。The present invention relates to the communication field, in particular to a method and device for discovering an application layer transmission optimization server.
背景技术Background technique
目前，大量应用需要从一个或是多个候选的主机中选择合适的节点来获取其需要的资源，比如：对等网络（Peer-to-Peer，简称为P2P）应用、内容分发网络（Content DeliveryNetwork，简称为CDN）选择、镜像选择等。应用层传输优化（Application-Layer Traffic Optimization，简称为ALTO）服务器的作用就是为这些应用提供网络相关的信息支撑，以指导应用对候选节点进行更合理的选择。ALTO技术是基于客户机/服务器（Client/Server，简称为C/S）结构的，ALTO客户端从ALTO服务器获得相关候选节点的指导信息，首先就需要ALTO客户端能够发现ALTO服务器。草案“draft-ietf-alto-server-discovery-03”就是描述ALTO服务器发现协议的。其中，描述获取ALTO服务器的通用资源标识符（Uniform Resource Identifier，简称为URI）的操作如下：At present, a large number of applications need to select a suitable node from one or more candidate hosts to obtain the resources they need, such as: Peer-to-Peer (P2P) applications, Content Delivery Network (Content Delivery Network) , referred to as CDN) selection, mirror selection, etc. The role of the Application-Layer Traffic Optimization (ALTO) server is to provide network-related information support for these applications, so as to guide the applications to make more reasonable selection of candidate nodes. ALTO technology is based on the client/server (Client/Server, referred to as C/S) structure. The ALTO client obtains the guidance information of the relevant candidate nodes from the ALTO server. First, the ALTO client needs to be able to discover the ALTO server. The draft "draft-ietf-alto-server-discovery-03" describes the ALTO server discovery protocol. Among them, the operation of obtaining the Uniform Resource Identifier (URI for short) of the ALTO server is described as follows:
1、获取接入网域名。获取方式可以是通过用户输入、动态主机配置协议（Dynamic HostConfiguration Protocol，简称为DHCP）选项，或是通过客户端地址进行逆向域名解析服务器（DomainName System，简称为DNS）的方式来获取；1. Obtain the domain name of the access network. The acquisition method can be obtained through user input, Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol, referred to as DHCP) option, or reverse domain name resolution server (DomainName System, referred to as DNS) through the client address;
2、将获取到的接入网域名作为使用通用资源标识符的名称权威指针（URI-enabledNamingAuthority Pointer，简称为U-NAPTR）的输入，进一步获取ALTO服务器的信息资源目录的URI。2. Use the obtained domain name of the access network as the input of the name authority pointer (URI-enabledNamingAuthority Pointer, referred to as U-NAPTR) using the universal resource identifier, and further obtain the URI of the information resource directory of the ALTO server.
但是，在特定网络下，例如在应用点对点协议（Point-to-Point Protocol，简称为PPP）的环境中，只运行PPP协议来获取主机网络地址，不存在DHCP服务器，此时是无法通过DHCP的方式来获取接入网域名的，导致不能通过DHCP的方式完成ALTO服务器发现。However, in a specific network, for example, in an environment where the Point-to-Point Protocol (PPP) is applied, only the PPP protocol is run to obtain the network address of the host, and there is no DHCP server, so DHCP cannot be passed at this time. Obtaining the domain name of the access network by means of other methods, resulting in the inability to complete the discovery of the ALTO server through DHCP.
针对现有技术中在PPP协议中无法通过DHCP的方式完成ALTO服务器发现的问题，目前尚未提出有效的解决方案。Aiming at the problem in the prior art that the discovery of the ALTO server cannot be completed through DHCP in the PPP protocol, no effective solution has been proposed yet.
发明内容Contents of the invention
本发明提供了一种应用层传输优化服务器发现方法及装置，以至少解决上述问题。The present invention provides a method and device for discovering an application layer transmission optimization server to at least solve the above problems.
根据本发明的一个方面，提供了一种应用层传输优化服务器发现方法，包括：应用层传输优化（ALTO）客户端通过与点对点（PPP）服务端进行PPP协议下的信息交互，获得PPP服务端配置的接入网域名；ALTO客户端根据接入网域名获取ALTO服务器的通用资源标识符（URL）。According to one aspect of the present invention, a method for discovering an application layer transport optimization server is provided, including: the application layer transport optimization (ALTO) client obtains the PPP server end through information interaction under the PPP protocol with the point-to-point (PPP) server end The configured domain name of the access network; the ALTO client obtains the universal resource identifier (URL) of the ALTO server according to the domain name of the access network.
优选地，应用层传输优化（ALTO）客户端通过与点对点（PPP）服务端进行PPP协议下的信息交互，获得PPP服务端配置的接入网域名，包括：ALTO客户端向PPP服务端发送PPP请求，其中，PPP请求中携带接入网域名配置选项；在PPP服务端为接入网域名配置选项配置好对应的接入网域名后，ALTO客户端接收来自PPP服务端的接入网域名。Preferably, the application layer transmission optimization (ALTO) client obtains the access network domain name configured by the PPP server through information interaction under the PPP protocol with the point-to-point (PPP) server, including: the ALTO client sends the PPP server to the PPP server request, wherein the PPP request carries the access network domain name configuration option; after the PPP server configures the corresponding access network domain name for the access network domain name configuration option, the ALTO client receives the access network domain name from the PPP server.
优选地，ALTO客户端采用以下方式将PPP请求发送给PPP服务端：将PPP请求携带在第一网络控制协议（Network Control Protocol，简称为NCP）报文中发送给PPP服务端。Preferably, the ALTO client sends the PPP request to the PPP server in the following manner: the PPP request is sent to the PPP server in a first Network Control Protocol (NCP) message.
优选地，ALTO客户端采用以下方式接收来自PPP服务端的接入网域名：接收PPP服务端发送的第二NCP报文，其中，第二NCP报文中携带接入网域名。Preferably, the ALTO client receives the access network domain name from the PPP server in the following manner: receiving the second NCP message sent by the PPP server, wherein the second NCP message carries the access network domain name.
优选地，ALTO客户端根据接入网域名获取ALTO服务器的通用资源标识符URL，包括：ALTO客户端根据接入网域名，采用使用通用资源标识符的名称权威指针（U-NAPTRA）查询方式得到ALTO服务器的URL。Preferably, the ALTO client obtains the URI URL of the ALTO server according to the domain name of the access network, including: the ALTO client obtains the U-NAPTRA query method using the U-NAPTRA according to the domain name of the access network The URL of the ALTO server.
根据本发明的另一方面，提供了一种应用层传输优化服务器发现装置，包括：交互模块，用于通过与点对点（PPP）服务端进行PPP协议下的信息交互，获得PPP服务端配置的接入网域名；获取模块，用于根据接入网域名获取ALTO服务器的通用资源标识符（URL）。According to another aspect of the present invention, an application layer transmission optimization server discovery device is provided, including: an interaction module, which is used to exchange information under the PPP protocol with a point-to-point (PPP) server to obtain an interface configured by the PPP server. An access network domain name; an acquisition module, configured to acquire the universal resource identifier (URL) of the ALTO server according to the access network domain name.
优选地，交互模块包括：发送单元，用于向PPP服务端发送PPP请求，其中，PPP请求中携带接入网域名配置选项；接收单元，用于在PPP服务端为接入网域名配置选项配置好对应的接入网域名后，接收来自PPP服务端的接入网域名。Preferably, the interaction module includes: a sending unit for sending a PPP request to the PPP server, wherein the PPP request carries the access network domain name configuration option; a receiving unit for configuring the access network domain name configuration option at the PPP server After confirming the corresponding access network domain name, receive the access network domain name from the PPP server.
优选地，发送单元采用以下方式将PPP请求发送给PPP服务端：将PPP请求携带在第一网络控制协议（NCP）报文中发送给PPP服务端。Preferably, the sending unit sends the PPP request to the PPP server in the following manner: carrying the PPP request in a first Network Control Protocol (NCP) message and sending it to the PPP server.
优选地，接收单元采用以下方式接收来自PPP服务端的接入网域名：接收PPP服务端发送的第二NCP报文，其中，第二NCP报文中携带接入网域名。Preferably, the receiving unit receives the access network domain name from the PPP server in the following manner: receiving the second NCP message sent by the PPP server, wherein the second NCP message carries the access network domain name.
优选地，获取模块包括：查询单元，用于根据接入网域名，采用使用通用资源标识符的名称权威指针（U-NAPTRA）查询方式得到ALTO服务器的URL。Preferably, the acquisition module includes: a query unit, configured to obtain the URL of the ALTO server by using a Universal Resource Identifier Name Authority Pointer (U-NAPTRA) query method according to the domain name of the access network.
通过本发明，采用PPP交互方式为ALTO客户端提供接入网域名，ALTO根据接入网域名确定ALTO服务器的URL的方式，解决了在PPP协议中无法通过DHCP的方式完成ALTO服务器发现的问题，进而达到了在PPP协议中同样发现ALTO服务器的效果。Through the present invention, the PPP interactive mode is adopted to provide the access network domain name for the ALTO client, and the method in which ALTO determines the URL of the ALTO server according to the access network domain name solves the problem that the ALTO server cannot be discovered by means of DHCP in the PPP protocol. Then the effect of discovering the ALTO server in the PPP protocol is also achieved.
附图说明Description of drawings
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:
图1是根据本发明实施例的应用层传输优化服务器发现方法流程图；FIG. 1 is a flowchart of a method for discovering an application layer transmission optimization server according to an embodiment of the present invention;
图2是根据本发明优选实施例的ALTO服务器发现方法的流程示意图；Fig. 2 is a schematic flow chart of an ALTO server discovery method according to a preferred embodiment of the present invention;
图3是根据本发明实施例的应用层传输优化服务器发现装置的结构框图；FIG. 3 is a structural block diagram of an apparatus for discovering an application layer transmission optimization server according to an embodiment of the present invention;
图4是根据本发明优选实施例的应用层传输优化服务器发现装置的结构框图。Fig. 4 is a structural block diagram of an apparatus for discovering an application layer transmission optimization server according to a preferred embodiment of the present invention.
具体实施方式Detailed ways
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
图1是根据本发明实施例的应用层传输优化服务器发现方法流程图，如图1所示，该方法主要包括以下步骤（步骤S102-步骤S104）：Fig. 1 is a flowchart of a method for discovering an application layer transmission optimization server according to an embodiment of the present invention. As shown in Fig. 1 , the method mainly includes the following steps (step S102-step S104):
步骤S102，应用层传输优化（ALTO）客户端通过与点对点（PPP）服务端进行PPP协议下的信息交互，获得PPP服务端配置的接入网域名；Step S102, the application layer transmission optimization (ALTO) client obtains the access network domain name configured by the PPP server through information interaction under the PPP protocol with the point-to-point (PPP) server;
步骤S104，ALTO客户端根据接入网域名获取ALTO服务器的通用资源标识符（URL）。Step S104, the ALTO client obtains the universal resource identifier (URL) of the ALTO server according to the domain name of the access network.
在本实施例中，步骤S102可以这样实施：ALTO客户端向PPP服务端发送PPP请求，其中，PPP请求中携带接入网域名配置选项；在PPP服务端为接入网域名配置选项配置好对应的接入网域名后，ALTO客户端接收来自PPP服务端的接入网域名。In this embodiment, step S102 can be implemented as follows: the ALTO client sends a PPP request to the PPP server, wherein the PPP request carries the access network domain name configuration option; After the domain name of the access network, the ALTO client receives the domain name of the access network from the PPP server.
其中，ALTO客户端可以采用以下方式将PPP请求发送给PPP服务端：将PPP请求携带在第一网络控制协议（NCP）报文中发送给PPP服务端。ALTO客户端可以采用以下方式接收来自PPP服务端的接入网域名：接收PPP服务端发送的第二NCP报文，其中，第二NCP报文中携带接入网域名。Wherein, the ALTO client can send the PPP request to the PPP server in the following manner: carry the PPP request in a first network control protocol (NCP) message and send it to the PPP server. The ALTO client may receive the access network domain name from the PPP server in the following manner: receiving the second NCP message sent by the PPP server, wherein the second NCP message carries the access network domain name.
在本实施例中，步骤S104可以这样实施：ALTO客户端根据接入网域名，采用使用通用资源标识符的名称权威指针（U-NAPTRA）查询方式得到ALTO服务器的URL。In this embodiment, step S104 can be implemented as follows: the ALTO client obtains the URL of the ALTO server by using the U-NAPTRA query method according to the domain name of the access network.
通过这种方式，在PPP协议环境下，ALTO客户端同样可以获得PPP服务端的接入网域名。In this way, under the PPP protocol environment, the ALTO client can also obtain the domain name of the access network of the PPP server.
下面结合图2及优选实施例对上述实施例提供的应用层传输优化服务器发现方法进行详细说明。The method for discovering an application layer transmission optimization server provided by the above embodiment will be described in detail below in conjunction with FIG. 2 and the preferred embodiment.
图2是根据本发明优选实施例的ALTO服务器发现方法的流程示意图，如图2所示，该流程包括以下步骤（步骤S202-步骤S206）：Fig. 2 is a schematic flow diagram of an ALTO server discovery method according to a preferred embodiment of the present invention. As shown in Fig. 2, the flow includes the following steps (step S202-step S206):
步骤S202，ALTO客户端发起PPP请求，请求报文（即上述第一NCP报文）中包含了接入网域名配置选项。In step S202, the ALTO client initiates a PPP request, and the request message (that is, the above-mentioned first NCP message) includes the access network domain name configuration options.
其中，ALTO客户端具备PPP配置请求功能的设备，例如：用户终端，它需要执行本身原有功能的基础上还要执行ALTO客户端的功能。Among them, the ALTO client is a device with the PPP configuration request function, such as a user terminal, which needs to perform the functions of the ALTO client in addition to its original functions.
这些设备都要获取ALTO服务器的信息以便使用ALTO服务。在完成正常PPP协商过程中的链路层建链和认证工作之后，是通过NCP报文交互的方式来获取本端网络层的配置信息的，例如：IP地址等。These devices must obtain information from the ALTO server in order to use ALTO services. After the link layer link building and authentication work in the normal PPP negotiation process is completed, the configuration information of the local network layer, such as the IP address, is obtained through the exchange of NCP messages.
不同的配置信息通过不同的NCP报文选项来指定获取，在请求过程中，请求报文包含请求端所需配置的选项，应答报文负责把请求报文中指定选项的结果返回给请求端。Different configuration information is specified and obtained through different NCP message options. During the request process, the request message contains the options that the requester needs to configure, and the response message is responsible for returning the results of the specified options in the request message to the requester.
在本实施例中，需要在PPP请求中携带接入网域名配置选项（即上述接入网域名配置选项）来进一步获取进行U-NAPTR查询所需要的域名信息（即上述接入网域名），需要原有的NCP报文增加接入网域名选项来支持。In this embodiment, it is necessary to carry the access network domain name configuration option (that is, the above-mentioned access network domain name configuration option) in the PPP request to further obtain the domain name information required for U-NAPTR query (that is, the above-mentioned access network domain name), It is necessary to add the access network domain name option to the original NCP message to support it.
步骤S204，PPP服务端发送应答报文（即上述第二NCP报文），其中包含接入网域名选项中携带的请求端（即ALTO客户端）对应的接入网域名信息。In step S204, the PPP server sends a response message (that is, the second NCP message), which includes the access network domain name information corresponding to the requesting end (ie, the ALTO client) carried in the access network domain name option.
其中，PPP服务端可以是网络运营商提供的PPP服务器，负责下发网络配置给终端网络设备。PPP服务端作为PPP配置发送的一端，接收到配置请求报文（即上述第一NCP报文）之后，需要进行识别后处理其中的接入网域名配置选项，把接入网域名包含在应答报文（即上述第二NCP报文）中传送给请求端；Wherein, the PPP server may be a PPP server provided by a network operator, responsible for delivering network configurations to terminal network devices. As the end sending the PPP configuration, the PPP server needs to identify and process the access network domain name configuration option after receiving the configuration request message (that is, the first NCP message), and include the access network domain name in the response message. sent to the requesting end in the above-mentioned second NCP message;
步骤S206，ALTO客户端提取接入网域名，然后用U-NAPTR方式进行查询，获取ALTO服务器的URI。In step S206, the ALTO client extracts the domain name of the access network, and then performs a query using U-NAPTR to obtain the URI of the ALTO server.
本实施例主要针对特殊场景（PPP协议），在没有DHCP服务器的情况下，同样可以通过PPP协议的方式用来发现ALTO服务器，补充了ALTO服务器发现的使用场景和方法。This embodiment is mainly aimed at a special scenario (PPP protocol). In the absence of a DHCP server, the PPP protocol can also be used to discover the ALTO server, supplementing the usage scenario and method of ALTO server discovery.
需要说明的是，因为现有的PPP协议中NCP报文并不支持发送接入网域名配置选项，本实施例扩展NCP协议报文选项，以增加对接入网域名配置选项及其配置好的接入网域名的支持。It should be noted that, because the NCP message in the existing PPP protocol does not support sending the access network domain name configuration option, this embodiment expands the NCP protocol message option to increase the access network domain name configuration option and its configuration. Access network domain name support.
采用上述实施例提供的应用层传输优化服务器发现方法，通过PPP交互方式为ALTO客户端提供接入网域名，ALTO再根据接入网域名确定ALTO服务器的URL，解决了在PPP协议中无法通过DHCP的方式完成ALTO服务器发现的问题，进而达到了在PPP协议中同样发现ALTO服务器的效果。Using the application layer transmission optimization server discovery method provided by the above embodiment, the access network domain name is provided for the ALTO client through the PPP interactive mode, and ALTO determines the URL of the ALTO server according to the access network domain name, which solves the problem that the DHCP cannot be passed in the PPP protocol The problem found by the ALTO server is completed in a way, and then the effect of discovering the ALTO server in the PPP protocol is also achieved.
图3是根据本发明实施例的应用层传输优化服务器发现装置的结构框图，该装置用以实现上述实施例提供的应用层传输优化服务器发现方法，如图3所示，该装置主要包括：交互模块10和获取模块20。其中，交互模块10，用于通过与点对点（PPP）服务端进行PPP协议下的信息交互，获得PPP服务端配置的接入网域名；获取模块20，连接至交互模块10，用于根据接入网域名获取ALTO服务器的通用资源标识符（URL）。Fig. 3 is a structural block diagram of an application layer transmission optimization server discovery device according to an embodiment of the present invention, the device is used to implement the application layer transmission optimization server discovery method provided in the above embodiment, as shown in Fig. 3, the device mainly includes:
图4是根据本发明优选实施例的应用层传输优化服务器发现装置的结构框图，如图4所示，在该优选实施例提供的装置中，交互模块10可以包括：发送单元12，用于向PPP服务端发送PPP请求，其中，PPP请求中携带接入网域名配置选项；接收单元14，连接至发送单元12，用于在PPP服务端为接入网域名配置选项配置好对应的接入网域名后，接收来自PPP服务端的接入网域名。Fig. 4 is a structural block diagram of an application layer transmission optimization server discovery device according to a preferred embodiment of the present invention. As shown in Fig. 4, in the device provided in this preferred embodiment, the
其中，发送单元12可以采用以下方式将PPP请求发送给PPP服务端：将PPP请求携带在第一网络控制协议（NCP）报文中发送给PPP服务端。Wherein, the sending unit 12 may send the PPP request to the PPP server in the following manner: carry the PPP request in a first network control protocol (NCP) message and send it to the PPP server.
接收单元14可以采用以下方式接收来自PPP服务端的接入网域名：接收PPP服务端发送的第二NCP报文，其中，第二NCP报文中携带接入网域名。The receiving unit 14 may receive the access network domain name from the PPP server in the following manner: receiving the second NCP message sent by the PPP server, wherein the second NCP message carries the access network domain name.
在该优选实施例提供的装置中，获取模块20可以包括：查询单元22，用于根据接入网域名，采用使用通用资源标识符的名称权威指针（U-NAPTRA）查询方式得到ALTO服务器的URL。In the device provided in this preferred embodiment, the
采用上述实施例提供的应用层传输优化服务器发现装置，通过PPP交互方式为ALTO客户端提供接入网域名，ALTO再根据接入网域名确定ALTO服务器的URL，解决了在PPP协议中无法通过DHCP的方式完成ALTO服务器发现的问题，进而达到了在PPP协议中同样发现ALTO服务器的效果。Using the application layer transmission optimization server discovery device provided by the above-mentioned embodiment, the access network domain name is provided for the ALTO client through the PPP interactive mode, and ALTO determines the URL of the ALTO server according to the access network domain name, which solves the problem that the DHCP cannot be passed in the PPP protocol The problem found by the ALTO server is completed in a way, and then the effect of discovering the ALTO server in the PPP protocol is also achieved.
从以上的描述中，可以看出，本发明实现了如下技术效果：From the above description, it can be seen that the present invention achieves the following technical effects:
采用PPP交互方式为ALTO客户端提供接入网域名，ALTO根据接入网域名确定ALTO服务器的URL的方式，解决了在PPP协议中无法通过DHCP的方式完成ALTO服务器发现的问题，进而达到了在PPP协议中同样发现ALTO服务器的效果。Using the PPP interactive method to provide the access network domain name for the ALTO client, ALTO determines the URL of the ALTO server according to the access network domain name, which solves the problem that the ALTO server cannot be discovered through the DHCP method in the PPP protocol, and thus achieves The effect of the ALTO server is also found in the PPP protocol.
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
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