WO2011143869A1 - 一种提高域名解析效率的方法及终端 - Google Patents

一种提高域名解析效率的方法及终端 Download PDF

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Publication number
WO2011143869A1
WO2011143869A1 PCT/CN2010/076602 CN2010076602W WO2011143869A1 WO 2011143869 A1 WO2011143869 A1 WO 2011143869A1 CN 2010076602 W CN2010076602 W CN 2010076602W WO 2011143869 A1 WO2011143869 A1 WO 2011143869A1
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Prior art keywords
domain name
format
name resolution
resolution request
module
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PCT/CN2010/076602
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English (en)
French (fr)
Inventor
彭凯
高建英
李慧
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US13/505,594 priority Critical patent/US8862778B2/en
Priority to EP10851626.1A priority patent/EP2574011B1/en
Publication of WO2011143869A1 publication Critical patent/WO2011143869A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/45Network directories; Name-to-address mapping
    • H04L61/4505Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
    • H04L61/4511Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00Indexing scheme associated with group H04L61/00
    • H04L2101/60Types of network addresses
    • H04L2101/686Types of network addresses using dual-stack hosts, e.g. in Internet protocol version 4 [IPv4]/Internet protocol version 6 [IPv6] networks

Definitions

  • the present invention relates to a communication network system, and more particularly to a method and terminal for improving domain name resolution efficiency in an Internet Protocol Version 4 (IPv4) / Internet Protocol Version 6 (IPv6) dual stack environment.
  • IPv4 Internet Protocol Version 4
  • IPv6 Internet Protocol Version 6
  • IPv6 has not yet been applied on a large scale, with the rapid shortage of global IP addresses and business needs, the rapid development and gradual popularization of IPv6 has become inevitable. But how to transition is also an important issue.
  • IPv4/IPv6 dual stack approach is a common transition mechanism.
  • the terminal when the terminal initiates the service, it will inevitably involve the selection of the IP mode.
  • the service access is the way of using the domain name, then the domain name resolution becomes a key point.
  • the terminal initiates a domain name request.
  • DNS Domain Name System
  • AAAA Domain Name System resolution request method
  • the A mode corresponds to the IPv4 address format request
  • the AAAA mode corresponds to the IPv6 address format request.
  • the policy for sending a DNS resolution request is generally a fixed continuous use of two methods, first A mode and then AAAA mode, or vice versa.
  • the IP address corresponding to the domain name in the network environment is relatively fixed. In this way, there are always two failures in the two consecutive requests. For example, if the accessed service only supports IPv6 addresses, the domain name server will definitely fail when responding to the first A-mode DNS resolution request, and only when receiving the second AAAA-style DNS resolution request initiated by the dual-stack terminal. The IPv6 format address will be correctly responded, so the efficiency of the dual-stack terminal will be affected when accessing the IPv6 service. Conversely, if the DNS request is always made in the AAAA mode and then in the A mode, the effect is not satisfactory when accessing the IPv4 service. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a method and a terminal for improving the efficiency of domain name resolution, so as to improve the efficiency of domain name request.
  • the present invention provides a method for improving domain name resolution efficiency, which is implemented in a terminal supporting IPv4/IPv6 dual stack, and the method includes
  • the terminal initiates a domain name resolution request to the domain name system server;
  • the first format corresponding to the local domain name resolution request is recorded as the default initiation format of the current domain name resolution request.
  • the method further includes: when the terminal obtains an abnormal response by using the domain name resolution request initiated by the default initiation format, initiating a domain name resolution request in the second format, and changing the default initiation format of the current domain name resolution request to the second format.
  • the first format and the second format are respectively one of an A format and an AAAA format, and the A format corresponds to an IPv4 address format, and the AAAA format corresponds to an IPv6 address format.
  • the present invention further provides a terminal that supports an IPv4/IPv6 dual stack, including:
  • An application module configured to: trigger a domain name parsing module when an application service requiring domain name resolution is enabled;
  • the domain name resolution module is configured to: initiate a domain name resolution request to the domain name system server, and when the normal response is obtained, record the first format corresponding to the current domain name resolution request as the default initiation format of the current domain name resolution request.
  • the above terminal also has the following features:
  • the domain name resolution module is further configured to: when the domain name resolution request initiated by the default initiation format is abnormally responded, initiate a domain name resolution request in a second format, and change a default initiation format of the current domain name resolution request to the The second format.
  • the terminal has the following features:
  • the domain name resolution module includes:
  • the message processing sub-module is configured to: after receiving the trigger message of the application module, obtain a domain name resolution request format from the policy control sub-module, and encapsulate the domain name resolution request message by using the obtained domain name resolution request format, and then send the domain name resolution request message to the domain name And receiving, by the system server, a normal response message returned by the domain name system server, parsing the corresponding IP address from the normal response message, sending the IP address to the application module, and notifying the policy control Submodule; and a policy control sub-module, configured to: maintain a domain name resolution request policy, provide a format of the currently used domain name resolution request to the packet processing sub-module; and, after receiving the notification, corresponding to the domain name resolution request A format record is the default originating format for the current domain name resolution request.
  • the above terminal also has the following features:
  • the packet processing sub-module is further configured to: if the abnormal response message returned by the domain name system server is received, obtain the second format from the policy control sub-module, and encapsulate the domain name in the second format Parsing the request message and sending it to the domain name system server;
  • the policy control sub-module is further configured to: after providing the second format to the packet processing sub-module, change a default initiation format of the current domain name resolution request to the second format.
  • the above terminal also has the following features:
  • the first format and the second format are respectively one of an A format and an AAAA format, and the A format corresponds to an IPv4 address format, and the AAAA format corresponds to an IPv6 address format.
  • the method and terminal for improving the efficiency of domain name resolution play a role of dynamically adapting to the network environment to a certain extent, and can improve the efficiency of domain name request, thereby improving the fluency of the entire service access.
  • Figure 2 is a schematic illustration of a terminal of the present invention
  • FIG. 3 is a flow chart of a method for improving domain name resolution efficiency of the present invention.
  • FIG. 1 is a network diagram of an application of the present invention. As shown in the figure, the terminal supports IPv4/IPv6 dual stack. You can access the IPv4 server through domain name resolution through the DNS server, or access the IPv6 server.
  • the present invention provides a terminal that supports IPv4/IPv6 dual stack, as shown in FIG. 2, the terminal Includes:
  • the application module is used to trigger the domain name resolution module when the application service that requires domain name resolution is enabled.
  • the application module When the application module triggers the domain name resolution module, it passes the domain name address that needs to be accessed to the domain name resolution module.
  • the domain name resolution module is configured to initiate a domain name resolution request.
  • the domain name resolution request is received, the first format corresponding to the domain name resolution request is recorded as the default initiation format of the current domain name resolution request.
  • the domain name resolution module initiates the domain name resolution request in the second format when the domain name resolution request initiated by the default initiation format is abnormally responded, and changes the default initiation format of the current domain name resolution request to the second format. .
  • the first format and the second format are respectively: one of an A format and an AAAA format,
  • the A format corresponds to an IPv4 address format
  • the AAAA format corresponds to an IPv6 address format. If the first format is A format, the second format is AAAA format; if the first format is AAAA format, the second format is A format.
  • the domain name resolution module may include: a message processing submodule and a policy control submodule.
  • the message processing sub-module is configured to: after receiving the trigger message of the application module, obtain a domain name resolution request format from the policy control sub-module, and encapsulate the domain name resolution request message by using the obtained domain name resolution request format, and then send the domain name resolution request message to the DNS server; If the normal response message returned by the DNS server is received, the corresponding IP address is parsed from the normal response message, and the IP address is sent to the Applying a module, and notifying the policy control submodule; and
  • a policy control sub-module configured to maintain a domain name resolution request policy, and provide the currently used domain name resolution request format to the message processing sub-module; and after receiving the notification, the method corresponding to the current domain name resolution request is initiated.
  • the first format is recorded as the default originating format of the current domain name resolution request.
  • the packet processing submodule is further configured to: if the abnormal response message returned by the DNS server is received, acquire the second format from the policy control submodule, and encapsulate the domain name in the second format. Parsing the request packet and sending it to the DNS server;
  • the policy control sub-module is further configured to: after the second format is provided to the packet processing sub-module, change a default initiation format of the current domain name resolution request to the second format.
  • the present invention further provides a method for improving the efficiency of domain name resolution by using the foregoing terminal. As shown in FIG. 3, the following steps may be included:
  • the terminal initiates a domain name resolution request to the DNS server.
  • the terminal when the terminal starts a specific application service, it will initiate a domain name resolution request to the DNS server.
  • the domain name resolution request format for initiating the domain name resolution request is recorded as the default initiation format of the current domain name resolution request.
  • the format of the domain name resolution request for initiating the domain name resolution request may be A format or AAAA format.
  • the default initiating format is preferentially used when a new request is initiated next time, rather than in a fixed order in two consecutive formats.
  • a certain domain name resolution request does not respond normally, another type of request is initiated, and at the same time, the domain name is requested to request a new default launch format.
  • the policy of the domain name request initiation mode is dynamically adjusted, instead of being fixed in a certain order, which plays a role of dynamically adapting to the network environment to a certain extent, can improve the efficiency of the domain name request, thereby improving the fluency of the entire service access.
  • the domain name resolution of the current terminal is in the A mode, and the domain name of the accessed service is in the IPv6 network.
  • the implementation steps are as follows:
  • the dual-stack terminal initiates an A-type domain name resolution request packet, and requests to resolve the IP address of the domain name 1;
  • S20 The DNS server queries that there is no corresponding record, and responds to the terminal with no IPv4 address;
  • the dual-stack terminal initiates an AAAA-type domain name resolution request, and requests to resolve the IP address of the domain name 1;
  • the DNS server finds the corresponding record, and if the parsing is successful, responds to the IPv6 address to the terminal; S50.
  • the dual-stack terminal accesses the service by using the IPv6 address;
  • the dual-stack terminal saves the AAAA mode as the priority domain name request format.
  • AAAA method is used to initiate a domain name resolution request.
  • the dual-stack terminal will initiate an A-mode request, and the A-type switching mode is the priority domain name request format.
  • the method for improving the efficiency of the domain name resolution provided by the present invention has the following advantages:
  • the domain name is used for the service access, and the performance of the domain name resolution is improved to improve the access efficiency of the entire service;
  • the dynamic DNS request mode can be flexibly adapted to different networks.
  • Business access; strategy is simple and practical, low cost.
  • the method and the terminal for improving the efficiency of domain name resolution provided by the present invention play a role of adapting to the network environment to a certain extent, and can improve the efficiency of the domain name request, thereby improving the fluency of the entire service access.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Description

一种提高域名解析效率的方法及终端
技术领域
本发明涉及通信网络系统, 特别是涉及, 在互联网协议第四版(IPv4 ) / 互联网协议第六版( IPv6 )双栈环境中提高域名解析效率的方法及终端。 背景技术
虽然 IPv6 目前还未大规模应用, 但随着全球 IP地址的快速匮乏和业务 需求, IPv6的快速发展、 逐步普及已经成为必然。 但这其中如何过渡也是一 个重要课题, IPv4/IPv6双栈的方式就是一种常见的过渡机制。
对于双栈方式, 终端发起业务的时候必然会涉及到 IP方式的选择, 并且 一般而言, 业务访问都是釆用域名的方式, 那么域名解析就成为了关键点。
在 IPv4和 IPv6双栈的场景下, 终端发起域名请求会有两种 DNS (域名 系统 )解析请求方式: A和 AAAA。 其中 A方式对应 IPv4地址格式请求, AAAA方式对应 IPv6地址格式请求。
这个前提下, 对于双栈的终端访问一个域名时, 发送 DNS解析请求的策 略一般是固定连续使用两种方式请求, 先 A方式再 AAAA方式, 或者相反。 现实场景中网络环境下的域名对应的 IP地址方式比较固定, 那么这样连续的 两种方式请求,一般总会有一个失败。比如访问的服务是仅支持 IPv6地址的, 域名服务器在响应第一个 A方式的 DNS解析请求时肯定会失败,只会在收到 双栈终端发起的第二个以 AAAA方式的 DNS解析请求时会正确响应 IPv6格 式地址, 那么双栈终端在访问 IPv6服务时, 效率会受到影响。 相反地, 如果 总是先以 AAAA方式,再以 A方式进行 DNS请求,那么在访问 IPv4服务时, 效果又不理想了。 发明内容
本发明要解决的技术问题是提供一种提高域名解析效率的方法及终端, 以提高域名请求的效率。 为了解决上述技术问题, 本发明提供了一种提高域名解析效率的方法, 在支持 IPv4/IPv6双栈的终端中实现的, 该方法包括,
终端向域名系统服务器发起域名解析请求;
当终端得到正常响应时, 将对应本次发起域名解析请求的第一格式记录 为当前域名解析请求的默认发起格式。
上述方法还包括: 当终端以所述默认发起格式发起的域名解析请求得到 非正常响应时, 以第二格式发起域名解析请求, 并将当前域名解析请求的默 认发起格式更改为第二格式。
上述方法还具有下面特点:
所述第一格式和所述第二格式分别为: A格式和 AAAA格式中的一种, 所述 A格式对应 IPv4地址格式, 所述 AAAA格式对应 IPv6地址格式。
为了解决上述技术问题,本发明还提供了一种终端,支持 IPv4/IPv6双栈, 包括:
应用模块, 其设置为: 在需要域名解析的应用业务开启时, 触发域名解 析模块; 及
域名解析模块, 其设置为: 向域名系统服务器发起域名解析请求, 当得 到正常响应时, 将对应本次发起域名解析请求的第一格式记录为当前域名解 析请求的默认发起格式。
上述终端还具有下面特点:
所述域名解析模块还设置为: 当以所述默认发起格式发起的域名解析请 求得到非正常响应时, 以第二格式发起域名解析请求, 并将当前域名解析请 求的默认发起格式更改为所述第二格式。
上述终端还具有下面特点: 所述域名解析模块包括:
报文处理子模块, 其设置为: 接收到所述应用模块的触发消息后, 从策 略控制子模块获取域名解析请求格式, 利用获取到的域名解析请求格式封装 域名解析请求报文后发送给域名系统服务器; 若接收到所述域名系统服务器 返回的正常响应报文, 从所述正常响应报文中解析出相应的 IP地址, 将该 IP 地址发送给所述应用模块, 并通知所述策略控制子模块; 及 策略控制子模块, 其设置为: 维护域名解析请求策略, 向所述报文处理 子模块提供当前使用的域名解析请求格式; 以及接收到所述通知后, 将对应 本次发起域名解析请求的第一格式记录为当前域名解析请求的默认发起格 式。
上述终端还具有下面特点:
所述报文处理子模块还设置为: 若接收到所述域名系统服务器返回的非 正常响应报文, 则向所述策略控制子模块获取所述第二格式, 以所述第二格 式封装域名解析请求报文后发送给域名系统服务器;
所述策略控制子模块还设置为: 向所述报文处理子模块提供所述第二格 式后, 将当前域名解析请求的默认发起格式更改为所述第二格式。
上述终端还具有下面特点:
所述第一格式和所述第二格式分别为: A格式和 AAAA格式中的一种, 所述 A格式对应 IPv4地址格式, 所述 AAAA格式对应 IPv6地址格式。
综上, 本发明提供的提高域名解析效率的方法及终端, 在一定程度上起 到了动态适应网络环境的作用, 可以提高域名请求的效率, 从而提高整个业 务访问的流畅度。 附图概述
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:
图 1是本发明的应用组网图;
图 2是本发明的终端的示意图;
图 3是本发明的提高域名解析效率的方法的流程图;
图 4是本发明的提高域名解析效率的方法实施例的流程图。 本发明的较佳实施方式
下面结合附图及实施例对本发明的技术方案进行更详细的说明。
图 1是本发明的应用组网图。 如图所示, 终端支持 IPv4/IPv6双栈, 可以 通过 DNS服务器进行域名解析后访问 IPv4服务器, 或者访问 IPv6服务器。
在该 IPv4/IPv6双栈环境下, 为了在终端接入网络进行业务访问时, 提高 其域名解析的效率,本发明提供一种终端,支持 IPv4/IPv6双栈,如图 2所示, 该终端包括:
应用模块, 用于在需要域名解析的应用业务开启时, 触发域名解析模块; 需要域名解析的应用业务有很多, 例如 SNTP (时间服务) , VOIP (语 音电话) , TR069 (网管) , IPTV (组播点播)等等, 每种应用跟服务器的 交互都可能是域名的方式。
应用模块触发域名解析模块时, 向域名解析模块传递需要访问的域名地 址。
域名解析模块, 用于发起的域名解析请求, 当得到正常响应时, 将对应 本次发起域名解析请求的第一格式记录为当前域名解析请求的默认发起格 式。
进一步地, 域名解析模块当以所述默认发起格式发起的域名解析请求得 到非正常响应时, 以第二格式发起域名解析请求, 并将当前域名解析请求的 默认发起格式更改为所述第二格式。
所述第一格式和第二格式分别为: A格式和 AAAA格式中的一种, 所述
A格式对应 IPv4地址格式, 所述 AAAA格式对应 IPv6地址格式。 若第一格 式为 A格式, 则第二格式为 AAAA格式; 若第一格式为 AAAA格式, 则第 二格式为 A格式。
其中, 域名解析模块可以包括: 报文处理子模块和策略控制子模块。 报文处理子模块, 用于接收到所述应用模块的触发消息后, 从策略控制 子模块获取域名解析请求格式, 利用获取到的域名解析请求格式封装域名解 析请求报文后发送给 DNS服务器; 若接收到 DNS服务器返回的正常响应报 文, 从所述正常响应 ^艮文中解析出相应的 IP地址, 将该 IP地址发送给所述 应用模块, 并通知所述策略控制子模块; 及
策略控制子模块, 用于维护域名解析请求策略, 向所述报文处理子模块 提供当前使用的域名解析请求格式; 用于接收到所述通知后, 将对应本次发 起域名解析请求的所述第一格式记录为当前域名解析请求的默认发起格式。
进一步地, 所述报文处理子模块, 还用于若接收到 DNS服务器返回的非 正常响应报文, 则向所述策略控制子模块获取所述第二格式, 以所述第二格 式封装域名解析请求报文后发送给 DNS服务器;
策略控制子模块, 还用于向所述报文处理子模块提供所述第二格式后, 将当前域名解析请求的默认发起格式更改为所述第二格式。
本发明还提供利用上述终端提高域名解析效率的方法, 如图 3所示, 可 以包括下面步骤:
511、 终端向 DNS服务器发起域名解析请求;
例如, 终端在开启某具体应用业务时, 将向 DNS服务器发起域名解析请 求。
512、 当终端得到正常响应时,将本次发起域名解析请求的域名解析请求 格式记录为当前域名解析请求的默认发起格式。
本次发起域名解析请求的域名解析请求格式可以是 A格式, 也可以是 AAAA格式。
这样, 在下次再发起新的请求时优先使用此默认发起格式, 而不是以固 定的顺序连续两种格式的方式发起请求。 而当某一次的域名解析请求无正常 响应时, 则发起另外一种方式的请求, 同时切换其域名请求新的默认发起格 式。 这样动态调整域名请求发起方式的策略, 而不是固定以某一顺序去请求, 在一定程度上起到了动态适应网络环境的作用, 可以提高域名请求的效率, 从而提高整个业务访问的流畅度。
下面参考图 4, 详细说明本发明的提高域名解析效率的方法的具体实施 方式。 以一个终端接入网络, 灵活动态选择域名请求方式, 以达到业务访问 效率提升的效果为实施例。
设定一下前提: 当前终端的域名解析优先以 A方式, 被访问业务的域名 对应处于 IPv6网络中, 实施步骤如下:
S10、 双栈终端发起 A方式的域名解析请求报文, 请求解析域名 1的 IP 地址;
S20、 DNS服务器查询无对应记录, 则向终端响应无 IPv4地址;
S30、 双栈终端发起 AAAA方式的域名解析请求 文, 请求解析域名 1 的 IP地址;
S40、 DNS服务器找到对应记录, 解析成功, 则向终端响应 IPv6地址; S50、 双栈终端使用 IPv6地址访问业务;
S60、 双栈终端保存 AAAA方式为优先域名请求格式;
S70、 下一次需要域名解析请求时, 优先使用 AAAA方式发起域名解析 请求;
S80、 当某一次 AAAA方式的域名请求不能正确解析时, 双栈终端将发 起 A方式请求, 同时切换 A方式为优先域名请求格式。
本发明提供的提高域名解析效率的方法具有以下优点: 业务访问多以域 名方式, 提高域名解析的性能对整个业务访问效率的提升具有普适性; 动态 调整 DNS请求方式, 可以灵活适应不同网络的业务访问; 策略简单实用, 成 本低廉。
尽管为示例目的, 已经公开了本发明的优选实施例, 本领域的技术人员 将意识到各种改进、 增加和取代也是可能的, 因此, 本发明的范围应当不限 于上述实施例。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 所述程序可以存储于计算机可读存储介质中, 如只读 存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
工业实用性
本发明提供的提高域名解析效率的方法及终端, 在一定程度上起到了动 态适应网络环境的作用, 可以提高域名请求的效率, 从而提高整个业务访问 的流畅度。

Claims

权 利 要 求 书
1、 一种提高域名解析效率的方法, 在支持互联网协议第四版(IPv4 ) / 互联网协议第六版( IPv6 )双栈的终端中实现的, 该方法包括,
终端向域名系统服务器发起域名解析请求;
当终端得到正常响应时, 将对应本次发起域名解析请求的第一格式记录 为当前域名解析请求的默认发起格式。
2、 如权利要求 1所述的方法, 该方法还包括:
当终端以所述默认发起格式发起的域名解析请求得到非正常响应时, 以 第二格式发起域名解析请求, 并将当前域名解析请求的默认发起格式更改为 第二格式。
3、 如权利要求 2所述的方法, 其中,
所述第一格式和所述第二格式分别为: A格式和 AAAA格式中的一种, 所述 A格式对应 IPv4地址格式, 所述 AAAA格式对应 IPv6地址格式。
4、一种终端, 支持互联网协议第四版( IPv4 ) /互联网协议第六版( IPv6 ) 双栈, 其包括:
应用模块, 其设置为: 在需要域名解析的应用业务开启时, 触发域名解 析模块; 及
域名解析模块, 其设置为: 向域名系统服务器发起域名解析请求, 当得 到正常响应时, 将对应本次发起域名解析请求的第一格式记录为当前域名解 析请求的默认发起格式。
5、 根据权利要求 4所述的终端, 其中,
所述域名解析模块还设置为: 当以所述默认发起格式发起的域名解析请 求得到非正常响应时, 以第二格式发起域名解析请求, 并将当前域名解析请 求的默认发起格式更改为所述第二格式。
6、 根据权利要求 4或 5所述的终端, 其中, 所述域名解析模块包括: 报文处理子模块, 其设置为: 接收到所述应用模块的触发消息后, 从策 略控制子模块获取域名解析请求格式, 利用获取到的域名解析请求格式封装 域名解析请求报文后发送给域名系统服务器; 若接收到所述域名系统服务器 返回的正常响应报文, 从所述正常响应报文中解析出相应的互联网协议(IP ) 地址, 将该 IP地址发送给所述应用模块, 并通知所述策略控制子模块; 及 策略控制子模块, 其设置为: 维护域名解析请求策略, 向所述报文处理 子模块提供当前使用的域名解析请求格式; 以及接收到所述通知后, 将对应 本次发起域名解析请求的第一格式记录为当前域名解析请求的默认发起格 式。
7、 根据权利要求 6所述的终端, 其中,
所述报文处理子模块, 还设置为: 若接收到所述域名系统服务器返回的 非正常响应报文, 则向所述策略控制子模块获取所述第二格式, 以所述第二 格式封装域名解析请求报文后发送给域名系统服务器;
所述策略控制子模块, 还设置为: 向所述报文处理子模块提供所述第二 格式后, 将当前域名解析请求的默认发起格式更改为所述第二格式。
8、 根据权利要求 5所述的终端, 其中,
所述第一格式和所述第二格式分别为: A格式和 AAAA格式中的一种, 所述 A格式对应 IPv4地址格式, 所述 AAAA格式对应 IPv6地址格式。
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