WO2012034456A1 - 一种获取dns的方法和隧道网关设备 - Google Patents

一种获取dns的方法和隧道网关设备 Download PDF

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Publication number
WO2012034456A1
WO2012034456A1 PCT/CN2011/077751 CN2011077751W WO2012034456A1 WO 2012034456 A1 WO2012034456 A1 WO 2012034456A1 CN 2011077751 W CN2011077751 W CN 2011077751W WO 2012034456 A1 WO2012034456 A1 WO 2012034456A1
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Prior art keywords
dns
gateway device
entry
client
tunnel gateway
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PCT/CN2011/077751
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English (en)
French (fr)
Inventor
袁立权
秦超
孙鹏
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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 EP11824526.5A priority Critical patent/EP2544402A4/en
Priority to US13/636,489 priority patent/US9300622B2/en
Publication of WO2012034456A1 publication Critical patent/WO2012034456A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/09Mapping addresses
    • H04L61/10Mapping addresses of different types
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46Interconnection of networks
    • H04L12/4633Interconnection of networks using encapsulation techniques, e.g. tunneling
    • 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/02Standardisation; Integration
    • H04L41/0213Standardised network management protocols, e.g. simple network management protocol [SNMP]

Definitions

  • the present invention relates to data communication technologies, and in particular, to a method for acquiring a DNS (Domain Name System, i or a name system) and a tunnel gateway device in a tunnel situation.
  • DNS Domain Name System, i or a name system
  • IPv4 As the mainstream network layer technology of Next-Generation Internet (NGI), is gradually entering its role.
  • the IETF provides tunnel-based technology such as Lightweight Dual Stack (DS-LITE) and IPv6 Rapid Deployment (6rd), both of which use tunneling.
  • DS-LITE Lightweight Dual Stack
  • 6rd IPv6 Rapid Deployment
  • DS-LITE provides a method for carrying IPv4 data services by using an IPv6 tunnel.
  • One end of DS-LITE can be at the home gateway, and the other end is at the boundary of IPv4/IPv6.
  • DS-LITE does not restrict the way of IPv6 connection. It can pass PPPoE. (Point to Point protocol over Ethernet, point-to-point protocol on Ethernet) or IPoE (IP over Ethernet, Internet Protocol over Ethernet).
  • IPv4 tunnels are used to carry IPv6 data services.
  • One end of 6rd can be at the home gateway, and the other end is at the boundary of IPv4/IPv6.
  • IPv6 clients inside the tunnel there are plans to support the protocol by extending DHCPv4.
  • the IPv6 DNS server is configured to configure the IPv6 DNS server corresponding to IPv6.
  • the present invention provides a method for obtaining a DNS and a tunnel gateway device, which implements DNS allocation in a tunnel mode.
  • the present invention provides a tunnel gateway device, where the tunnel gateway device is set to:
  • DNS Domain Name System
  • the device may be further configured to: receive the DNS request of the client, obtain the IP address information corresponding to the DNS request from the local or the DNS server, and return the corresponding IP address information is sent to the client.
  • the tunnel gateway device is configured to obtain IP address information corresponding to a DNS request from a local or the DNS server according to the following manner: after receiving the DNS request, searching for a local save a DNS entry, when the matching DNS entry exists locally, obtaining the corresponding IP address information according to the matched DNS entry; when the matching DNS entry does not exist locally, obtaining the matching from the configured DNS server DNS entry, obtaining the corresponding IP address information according to the matched DNS entry; or, after receiving the DNS request, obtaining a matching DNS entry from the configured DNS server, according to the matched DNS entry Obtaining the corresponding IP address information.
  • the tunnel gateway device is further configured to: save the DNS entry obtained from the DNS server, and, when saving the DNS entry, if a local DNS entry record has been When full, the local DNS entry is deleted according to the storage time and/or frequency of use of the DNS entry.
  • the device may be further configured to: receive the DNS request of the client, transparently forward the DNS request to the DNS server, and return the IP returned by the DNS server.
  • the address information is transparently forwarded to the client.
  • the foregoing device may further have the following features: the tunnel gateway device supports a lightweight dual stack (DS-LITE) and/or an IPv6 fast deployment (6rd) technology.
  • the foregoing device may also have the following features: the management protocol is a TR069 protocol or other terminal control protocol.
  • the present invention also provides a method for obtaining a DNS, including:
  • the automatic control server configures a DNS (Domain Name System) server address of the tunnel inner layer or the outer layer service network on the tunnel gateway device by using a management protocol;
  • DNS Domain Name System
  • the tunnel gateway device sends its own address as the address of the DNS server to the client; or the tunnel gateway device sends the DNS server address to the client.
  • the foregoing method may further include: when the tunnel gateway device sends the address of the DNS server to the client as the address of the DNS server, the method further includes:
  • the client sends a DNS request to the tunnel gateway device
  • the tunnel gateway device obtains the IP address information corresponding to the DNS request from the local or the DNS server, and returns the corresponding IP address information to the client.
  • the foregoing method may further include the following steps: the step of the tunnel gateway device acquiring the IP address information corresponding to the DNS request includes:
  • the tunnel gateway device After receiving the DNS request, the tunnel gateway device searches for a locally saved DNS entry. When a matching DNS entry exists locally, the corresponding IP address information is obtained according to the matched DNS entry. Obtaining the matching DNS entry from the DNS server of the inner layer of the tunnel or the outer layer of the service network, and obtaining the corresponding IP address information according to the matched DNS entry; or
  • the tunnel gateway device After receiving the DNS request, the tunnel gateway device obtains a matching DNS entry from the configured DNS server, and obtains the corresponding IP address information according to the matched DNS entry.
  • the foregoing method may further have the following features, the method further includes: the tunnel gateway device saves the DNS entry obtained from the DNS server, and when the DNS entry is saved, if the local DNS entry record has been When full, the local DNS entry is deleted according to the storage time and/or frequency of use of the DNS entry.
  • the method may further include the following feature: when the tunnel gateway device sends the DNS server address to the client, the method further includes: the tunnel gateway device receiving the client The DNS request is transparently forwarded to the DNS server, and the IP address information returned by the DNS server is transparently forwarded to the client.
  • the tunnel gateway device supports a lightweight dual stack (DS-LITE) and/or an IPv6 fast deployment (6rd) technology.
  • D-LITE lightweight dual stack
  • 6rd IPv6 fast deployment
  • the foregoing method may also have the following features, where the management protocol is the TR069 protocol or other terminal control protocol.
  • the embodiment of the present invention provides a method for allocating a DNS server that does not depend on an address protocol and a method for obtaining a DNS by a client.
  • the embodiment of the present invention can configure the address of the DNS server through the management protocol in a unified manner.
  • the gateway caches the corresponding DNS entry and responds to the DNS request sent by the client, thereby reducing the number of requests sent by the client to the remote DNS server.
  • FIG. 1 is a basic network diagram of a tunnel mode sanctioning IPv6 evolution in an embodiment of the present invention
  • FIG. 2 is a flow chart of a gateway device DNS server configuration and a client DNS obtaining process according to an embodiment of the present invention
  • 3 is a DNS server configuration and a client DNS obtaining process of a 6RD tunnel gateway device in an embodiment of the present invention
  • FIG. 4 is a flowchart showing a DNS server configuration and a client DNS obtaining process of a DS-LITE tunnel gateway device according to an embodiment of the present invention. Preferred embodiment of the invention
  • the automatic control server configures the DNS server address of the tunnel inner service network on the tunnel gateway device through the management protocol
  • the tunnel gateway device sends the configured DNS server address to the client.
  • the client sends a DNS request to the DNS server, and the DNS server responds to the DNS The request returns the corresponding IP address information to the client, where the information exchanged between the client and the DNS server is transparently forwarded by the tunnel gateway device.
  • the management protocol is the TR069 protocol or other terminal control protocol.
  • the tunnel gateway device supports a lightweight dual stack (DS-LITE) and/or an IPv6 fast deployment (6rd) technology.
  • the tunnel gateway device sends the DNS server address to the client when assigning an IP address to the client.
  • the automatic control server configures the DNS server address of the inner layer of the tunnel or the outer layer of the service network on the tunnel gateway device through the management protocol;
  • the tunnel gateway device sends its own address as the address of the DNS server to the client.
  • the tunnel gateway device receives the DNS request of the client, and obtains corresponding IP address information from the local or DNS server in response to the DNS request, and returns the corresponding IP address information to the client.
  • the tunnel gateway device obtains corresponding IP address information from the local or the DNS server according to the following manner:
  • the matching DNS entries obtained from the DNS server include: The tunnel gateway device initiates a DNS request to the DNS server, and the DNS server returns a DNS response, and the response carries the IP address information.
  • the gateway device obtains a matching DNS entry from the DNS server, and obtains the corresponding IP address information according to the matched DNS entry.
  • the management protocol is the TR069 protocol or other terminal control protocol, and the tunnel includes an IPv6 and an IPv4 tunnel.
  • the outer layer of the tunnel is an IPv6 encapsulation, and the inner layer is an IPv4 data.
  • the outer layer of the tunnel is IPv4 encapsulated, and the inner layer is IPv6 data.
  • the tunnel gateway device sends its own address as the DNS server address to the client when assigning an IP address to the client.
  • the tunnel gateway device further saves the DNS entry obtained from the DNS server, and when the DNS entry is saved, if the local DNS entry record is full, some DNS entries may be pre-stored according to the tunnel gateway device. , used to respond to DNS requests from clients.
  • the tunnel gateway device supports a lightweight dual stack (DS-LITE) and/or an IPv6 fast deployment (6rd) technology.
  • the two ends of the tunnel shown in Figure 1 include a tunnel gateway device and a tunnel network side device.
  • the automatic control server manages the tunnel gateway device and is connected through the Internet.
  • the tunnel gateway device can be connected to the IPv6 or IPv4 network. (DNS server) is located on an IPv6 or IPv4 network.
  • the tunneling technology includes DS-LITE and 6rd.
  • the client is an IPv4 terminal, and the Internet is an IPv6 network.
  • the tunnel gateway device completes the encapsulation and delivery of IPv4 services, and the tunnel network device decapsulates the IPv4 service to IPv4.
  • the client is an IPv6 terminal, and the Internet is an IPv4 network.
  • the tunnel gateway device completes the encapsulation and delivery of the IPv6 service, and the tunnel network device decapsulates the IPv6 service to the IPv6 network.
  • the client When the client connects to the Internet, it needs to send a DNS request to obtain the correspondence between the domain name and the IP address.
  • the DNS server is generally statically configured or dynamically assigned.
  • the tunnel gateway device can serve as a DNS server and provide a domain name service. After the DNS request, the tunnel gateway device responds to the DNS request. Because the device capacity of the tunnel gateway device is limited, it must interact with other network-side DNS servers to meet the DNS request initiated by the client. Therefore, the tunnel gateway device needs to obtain the address of the network-side DNS server.
  • the present invention uses the automatic control server to provide the address configuration of the DNS server.
  • the same configuration mode is used to complete the address of the network side DNS server. Configuration.
  • the method for obtaining DNS includes:
  • the corresponding network side DNS server address is configured on the tunnel gateway device through the management protocol, and the address is the destination address of the DNS request issued by the tunnel gateway device.
  • the tunnel gateway device receives a DNS request initiated by the client
  • the tunnel gateway device first checks the local DNS entry. If there is no matching DNS entry, the tunnel gateway device initiates a DNS request to the DNS server, the DNS server responds to the DNS request, and returns a DNS entry to the tunnel gateway device; the tunnel gateway device obtains the DNS entry, the DNS Entries can be cached locally and responded to the client. Since the tunnel gateway device has a limited cache size, after the local cache record is full, if a new DNS entry is reached, it needs to be able to save the new DNS entry and delete the local related DNS entry. Deleting a DNS entry can be performed in accordance with the time interval in which the DNS entry is saved, or based on the frequency of use of the DNS entry, or a combination of frequency and time as a condition for deletion.
  • the gateway device obtains a matching DNS entry from the DNS server, and obtains the corresponding IP address information according to the matched DNS entry.
  • the gateway device first checks the local DNS entry. If there is no matching DNS entry, the tunnel gateway device initiates an IPv6 DNS request with its own IPv6 or IPv4 address.
  • the IPv6 or IPv4 DNS server sent to the network side if sent through the IPv6 address, the DNS request sent is the data encapsulated by IPv4, and the Internet transparently transmits the relevant data.
  • the 6rd gateway obtains the IPv6 DNS record, it responds to the IPv6 DNS of the client. The request, if sent through an IPv4 address, does not need to be encapsulated when sending the DNS request, and directly reaches the IPv4 DNS server through the IPv4 network.
  • the tunnel gateway device first checks the local DNS entry. If there is no matching record, the tunnel gateway device An IPv4 DNS request is sent to the IPv4 or IPv6 DNS server on the network side by its own IPv4 or IPv6 address. If it is sent through an IPv4 address, the sent DNS request is data encapsulated by IPv6, and the Internet transparently transmits relevant data. After obtaining the IPv4 DNS record, the LITE gateway responds to the client's IPv4 DNS request. If it is sent through an IPv4 address, the DNS request sent is not encapsulated and reaches the IPv4 DNS server directly through the IPv4 network.
  • the address configuration of the DNS server is provided by using the automatic control server.
  • the address configuration of the network side DNS server is completed by using the same configuration mode.
  • the DS-LITE or 6rd tunnel gateway device allocates the network DNS server address of the tunnel inner-layer service through the management protocol.
  • the management protocol includes the TR069 protocol.
  • the tunnel gateway device After the tunnel gateway device obtains the corresponding network DNS server address of the tunnel inner-layer service, the tunnel gateway device will The DNS server address of the network in the inner layer of the tunnel is sent to the client. Generally, in the process of negotiating the IP address, the tunnel gateway device brings the relevant DNS Server address information to the client.
  • the tunnel gateway device After the client initiates the DNS request, the tunnel gateway device is reached.
  • the tunnel gateway device does not recognize the DNS request, and directly encapsulates the packet into the outer tunnel.
  • the DNS request sent by the client is transparently transmitted to the remote DNS server, and the DNS response returned by the DNS server is transparent.
  • the gateway gateway device does not participate in the interactive control of DNS information and only transparently forwards it to the client.
  • the outer layer of the tunnel is IPv6 encapsulation, and the inner layer is IPv4 data.
  • the outer layer of the tunnel is in IPv4 encapsulation and the inner layer is IPv6 data.
  • the network DNS server address of the inner-layer service of the tunnel is IPv4; in the case of 6rd, the network DNS server address of the inner-layer service of the tunnel is IPv6.
  • the embodiment of the present invention further provides a tunnel gateway device, where the tunnel gateway device is configured to: receive a DNS server address of a tunnel inner service network configured by an automatic control server through a management protocol;
  • the tunnel gateway device is further configured to: receive a DNS request from the client, obtain corresponding IP address information from the local or the DNS server, and return the corresponding IP address information to the client.
  • the tunnel gateway device is configured to obtain corresponding IP address information from a local or the DNS server according to the following manner:
  • the tunnel gateway device obtains a matching DNS entry from the DNS server after receiving the DNS request, and obtains the corresponding IP address information according to the matched DNS entry.
  • the tunnel gateway device is further configured to: save the DNS entry obtained from the DNS server, and, when saving the DNS entry, if the local DNS entry record is full, where the tunnel gateway device further The method is configured to: receive the DNS request of the client, transparently forward the DNS request to the DNS server, and transparently forward the IP address information returned by the DNS server to the client.
  • the tunnel gateway device supports a lightweight dual stack (DS-LITE) and/or an IPv6 fast deployment (6rd) technology.
  • the management protocol is the TR069 protocol or other terminal control protocol.
  • the foregoing embodiment provides a method for allocating a DNS server that does not depend on an address protocol and a method for obtaining a DNS by a client.
  • the address of the DNS server can be uniformly configured through a management protocol, and the gateway caches the corresponding DNS entry and responds to the client. DNS requests reduce the number of requests the client sends to the remote DNS server.

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  • Computer Networks & Wireless Communication (AREA)
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  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

本发明提供一种隧道网关设备,所述隧道网关设备用于:接收自动控制服务器通过管理协议配置的隧道内层或外层业务网络的DNS(域名系统)服务器地址;以及,将自身地址作为DNS服务器的地址发送给客户端,或者,将所述DNS服务器地址发送给客户端。本发明还提供一种获取DNS的方法,本发明不依赖于地址协议实现DNS服务器分配和获取DNS。

Description

一种获取 DNS的方法和隧道网关设备
技术领域
本发明涉及数据通信技术, 具体涉及一种在隧道情况下获取 DNS ( Domain Name System , i或名系统) 的方法和隧道网关设备。
背景技术
随着 Internet互联网的蓬勃发展,在可预计的不远未来,全球互联网用户 当前使用的 IPv4 全球单播地址将会逐步消耗殆尽; 同时全球范围内泛在网 ( Ubiquitous Network )的 4既念和物联网( Internet of Things )建设需求的兴起, IPv6作为下一代互联网( Next-Generation Internet , 简称 NGI )的主流网络层 技术正在逐步进入角色。
为了在向 IPv6演进过程中能够快速部署, IETF提供了基于隧道的技术轻 量级双栈 ( DS-LITE )和 IPv6快速部署( 6rd ) , 两种技术都使用了隧道技术。
DS-LITE提供了使用 IPv6隧道承载 IPv4数据业务的方法, DS-LITE的一 端可以在家庭网关处,另外一端在 IPv4/IPv6的边界处, DS-LITE并不限制 IPv6 连接的方式, 可以通过 PPPoE ( Point to Point protocol over Ethernet , 在以太网 上的点到点协议)或者 IPoE ( IP over Ethernet, 在以太网上互联网协议)等 方式接入, 对于隧道内部的 IPv4客户端, 如何获得 DNS还没有规定。 对于 6rd, 使用 IPv4的隧道承载 IPv6的数据业务, 6rd的一端可以在家庭网关处, 另外一端在 IPv4/IPv6的边界处, 对于隧道内部的 IPv6客户端, 现在有方案 通过扩展 DHCPv4的协议来支持携带 IPv6 的 DNS Server,从而配置 6rd的对 应 IPv6 的 DNS server。
使用 DHCP ( Dynamic Host Configuration Protocol, 动态主机配置协议 ) 来获得 DNS server, 必须支持 DHCP协议, 如果在不支持 DHCP协议的情况 下, 基于隧道方式的家庭网关则无法获得 DNS server。 发明内容 本发明提供一种获取 DNS的方法和隧道网关设备,实现隧道方式下 DNS 的分配。
为了解决上述问题, 本发明提供了一种隧道网关设备, 所述隧道网关设 备设置为:
接收自动控制服务器通过管理协议配置的隧道内层或外层业务网络的
DNS (域名系统)服务器地址; 以及,
将自身地址作为 DNS服务器的地址发送给客户端, 或者, 将所述 DNS 服务器地址发送给客户端。
可选地, 上述设备还可具有以下特点, 所述隧道网关设备还设置为: 接 收所述客户端的 DNS请求,从本地或者所述 DNS服务器获取 DNS请求对应 的 IP地址信息, 返回所述对应的 IP地址信息给所述客户端。
可选地, 上述设备还可具有以下特点, 所述隧道网关设备是设置为根据 如下方式从本地或者所述 DNS服务器获取 DNS请求对应的 IP地址信息: 接收到所述 DNS请求后, 查找本地保存的 DNS条目, 当本地存在匹配 的 DNS条目时, 根据所述匹配的 DNS条目获取所述对应的 IP地址信息; 当 本地不存在匹配的 DNS条目时, 从配置的所述 DNS服务器获取所述匹配的 DNS条目, 根据所述匹配的 DNS条目获取所述对应的 IP地址信息; 或者, 接收到所述 DNS请求后,从配置的所述 DNS服务器获取匹配的 DNS条 目, 根据所述匹配的 DNS条目获取所述对应的 IP地址信息。
可选地, 上述设备还可具有以下特点, 所述隧道网关设备还设置为: 保 存从所述 DNS服务器获取的所述 DNS条目,以及,在保存所述 DNS条目时, 如果本地 DNS条目记录已满, 则根据 DNS条目的存储时间和 /或使用频度删 除本地 DNS条目。
可选地, 上述设备还可具有以下特点, 所述隧道网关设备还设置为: 接 收所述客户端的 DNS请求, 将所述 DNS请求透明转发给所述 DNS服务器, 将所述 DNS服务器返回的 IP地址信息透明转发给所述客户端。
可选地, 上述设备还可具有以下特点, 所述隧道网关设备支持轻量级双 栈(DS-LITE )和 /或 IPv6快速部署(6rd )技术。 可选地, 上述设备还可具有以下特点, 所述管理协议为 TR069协议或其 他终端控制协议。
本发明还提供一种获取 DNS的方法, 包括:
自动控制服务器通过管理协议在所述隧道网关设备上配置隧道内层或外 层业务网络的 DNS (域名系统)服务器地址;
隧道网关设备将自身地址作为 DNS服务器的地址发送给客户端; 或者, 隧道网关设备将所述 DNS服务器地址发送给所述客户端。
可选地, 上述方法还可具有以下特点, 当隧道网关设备将自身地址作为 DNS服务器的地址发送给客户端时, 所述方法还包括:
所述客户端向所述隧道网关设备发送 DNS请求;
所述隧道网关设备从本地或者所述 DNS服务器获取所述 DNS请求对应 的 IP地址信息, 返回所述对应的 IP地址信息给所述客户端。
可选地, 上述方法还可具有以下特点, 所述隧道网关设备获取所述 DNS 请求对应的 IP地址信息的步骤包括:
所述隧道网关设备接收到所述 DNS请求后,查找本地保存的 DNS条目, 当本地存在匹配的 DNS条目时, 根据所述匹配的 DNS条目获取所述对应的 IP地址信息; 当本地不存在匹配的 DNS条目时,从配置的所述隧道内层或外 层业务网络的 DNS服务器获取所述匹配的 DNS条目, 根据所述匹配的 DNS 条目获取所述对应的 IP地址信息; 或者,
所述隧道网关设备接收到所述 DNS请求后, 从配置的所述 DNS服务器 获取匹配的 DNS条目, 根据所述匹配的 DNS条目获取所述对应的 IP地址信 息。
可选地, 上述方法还可具有以下特点, 所述方法还包括: 所述隧道网关 设备保存从所述 DNS服务器获取的所述 DNS条目,在保存所述 DNS条目时, 如果本地 DNS条目记录已满, 则根据 DNS条目的存储时间和 /或使用频度删 除本地 DNS条目。
可选地, 上述方法还可具有以下特点, 当隧道网关设备将所述 DNS服务 器地址发送给客户端时, 所述方法还包括, 所述隧道网关设备接收所述客户 端的 DNS请求,将所述 DNS请求透明转发给所述 DNS服务器,将所述 DNS 服务器返回的 IP地址信息透明转发给所述客户端。
可选地, 上述方法还可具有以下特点, 所述隧道网关设备支持轻量级双 栈(DS-LITE )和 /或 IPv6快速部署(6rd )技术。
可选地, 上述方法还可具有以下特点, 所述管理协议为 TR069协议或其 他终端控制协议。
本发明实施方式给出了不依赖于地址协议的 DNS server的分配方法和客 户端获得 DNS的方法。 本发明实施方式通过管理协议配置 DNS Server的地 址可以统一配置方式, 网关緩存相应的 DNS条目并回应客户端发出的 DNS 请求, 减少了客户端发给远端 DNS server的请求数量。 附图概述
图 1是本发明实施方式中隧道方式制裁 IPv6演进的基本网络图; 图 2是本发明实施方式中网关设备 DNS服务器配置和客户端 DNS获得 流程;
图 3是本发明实施方式中 6RD隧道网关设备 DNS服务器配置和客户端 DNS获得流程;
图 4是本发明实施方式中 DS-LITE隧道网关设备 DNS服务器配置和客户 端 DNS获得流程。 本发明的较佳实施方式
本发明实施方式提供的获取 DNS的方法有两种:
方法一:
自动控制服务器通过管理协议在隧道网关设备上配置隧道内层业务网络 的 DNS服务器地址;
隧道网关设备将配置的 DNS服务器地址发送给客户端。
可选地, 客户端发送 DNS请求给 DNS服务器, DNS服务器响应该 DNS 请求, 返回对应的 IP地址信息给客户端, 其中, 客户端和 DNS服务器之间 交互的信息由隧道网关设备透明转发。
其中, 所述管理协议为 TR069 协议或其他终端控制协议。
其中, 所述隧道网关设备支持轻量级双栈 ( DS-LITE )和 /或 IPv6快速部 署(6rd )技术。
其中, 隧道网关设备在给客户端分配 IP地址时把 DNS服务器地址发给 客户端。
方法二:
自动控制服务器通过管理协议在隧道网关设备上配置隧道内层或外层业 务网络的 DNS服务器地址;
隧道网关设备将自身地址作为 DNS服务器的地址发送给客户端。
进一步地, 隧道网关设备接收客户端的 DNS请求, 响应该 DNS请求, 从本地或者 DNS服务器获取对应的 IP地址信息, 返回所述对应的 IP地址信 息给所述客户端。
其中,所述隧道网关设备根据如下方式从本地或者所述 DNS服务器获取 对应的 IP地址信息:
接收到所述 DNS请求后, 查找本地保存的 DNS条目, 当本地存在匹配 的 DNS条目时, 根据所述匹配的 DNS条目获取所述对应的 IP地址信息; 当 本地不存在匹配的 DNS 条目时, 从配置的所述隧道内层或外层业务网络的 DNS服务器获取所述匹配的 DNS条目, 根据所述匹配的 DNS条目获取所述 对应的 IP地址信息。 其中, 从 DNS服务器获取匹配的 DNS条目包括: 隧道 网关设备发起 DNS请求至 DNS服务器, DNS服务器返回 DNS响应,响应中 携带 IP地址信息。
如果隧道网关设备本地不保存 DNS条目, 网关设备向 DNS服务器获取 匹配的 DNS条目, 根据匹配的 DNS条目获取所述对应的 IP地址信息。
其中,所述管理协议为 TR069协议或其他终端控制协议, 隧道包括 IPv6 和 IPv4隧道, 对于 DS-LITE, 隧道外层是 IPv6封装, 内层是 IPv4数据; 对 于 6rd, 隧道外层是 IPv4封装, 内层是 IPv6数据。
其中, 隧道网关设备在给客户端分配 IP地址时把自身地址作为 DNS服 务器地址发给客户端。
其中, 所述隧道网关设备还保存从所述 DNS服务器获取的所述 DNS条 目, 以及, 在保存所述 DNS条目时, 如果本地 DNS条目记录已满, 则根据 隧道网关设备上可以预存一些 DNS条目, 用于回应客户端发出的 DNS 请求。
其中, 所述隧道网关设备支持轻量级双栈 ( DS-LITE )和 /或 IPv6快速部 署(6rd )技术。
图 1所示的隧道两端包括隧道网关设备和隧道网络侧设备, 自动控制服 务器管理隧道网关设备, 通过互联网络相连, 隧道网关设备可 IPv6或者 IPv4 网络相连, 用于隧道内层业务的域名服务器 ( DNS服务器)位于 IPv6或 IPv4 网络中。
隧道技术包括 DS-LITE、 6rd, 对于 DS-LITE, 客户端是 IPv4终端, 互联 网络是 IPv6网络,隧道网关设备完成对于 IPv4业务的封装传递, 隧道网络侧 设备解封装后把 IPv4业务传递到 IPv4网络中。对于 6rd,客户端是 IPv6终端, 互联网络是 IPv4网络,隧道网关设备完成对于 IPv6业务的封装传递, 隧道网 络侧设备解封装后把 IPv6业务传递到 IPv6网络中。
客户端在连接因特网时, 需要发送 DNS请求, 获取域名和 IP地址的对 应关系, 而 DNS server—般是静态设置或动态分配的, 隧道网关设备可以作 为 DNS Server, 提供域名服务, 在客户端发起 DNS请求后, 隧道网关设备回 应 DNS请求。 由于隧道网关设备的设备能力有限, 它必须和其他的网络侧 DNS Server进行交互才能满足客户端发起的 DNS请求,所以隧道网关设备需 要获得网络侧 DNS server的地址。
本发明使用自动控制服务器提供 DNS Server的地址配置, 对于 DS-LITE 或 6rd的隧道网关设备,使用相同的配置方式完成网络侧 DNS服务器的地址 配置。
根据图 2所示, 本发明提供的获取 DNS的方法包括:
首先通过管理协议在隧道网关设备配置对应的网络侧 DNS服务器地址, 这个地址是隧道网关设备用于发出的 DNS请求的目的地址。
隧道网关设备接收客户端发起的 DNS请求;
隧道网关设备首先查看本地的 DNS条目, 如果没有匹配的 DNS条目, 隧道网关设备发起 DNS请求给 DNS服务器, DNS服务器回应 DNS请求, 返回 DNS条目给隧道网关设备; 隧道网关设备获得 DNS条目, 这个 DNS条 目可以緩存在本地, 并回应给客户端。 由于隧道网关设备的緩存大小有限, 在本地緩存记录记满后, 如果新的 DNS条目达到, 需要能保存新的 DNS条 目, 删除本地相关的 DNS条目。 删除 DNS条目可以依照保存 DNS条目的时 间先后进行删除, 也可以根据 DNS条目使用频度高低进行判断, 或者混合使 用频度和时间作为删除的条件。
如果隧道网关设备本地不保存 DNS条目, 网关设备向 DNS服务器获取 匹配的 DNS条目, 根据所述匹配的 DNS条目获取所述对应的 IP地址信息。
实施例 1
如图 3所示, 对于 6rd网关, 在客户端发起 IPv6 DNS请求后, 网关设备 首先查看本地的 DNS条目, 如果没有匹配的 DNS条目, 隧道网关设备发起 IPv6 DNS请求,以自身的 IPv6或 IPv4地址发送给网络侧的 IPv6或 IPv4 DNS 服务器, 如果通过 IPv6地址发送, 发送的 DNS请求是通过 IPv4封装过的数 据, 互联网络透明传递相关数据, 6rd网关获得 IPv6的 DNS记录后, 回应客 户端的 IPv6 DNS请求, 如果是通过 IPv4地址发送, 则发送的 DNS请求时不 用进行封装, 直接通过 IPv4网络达到 IPv4 DNS服务器。
实施例 2
如图 4所示, 对于 DS-LITE网关, 在客户端发起 IPv4 DNS请求后, 隧 道网关设备首先查看本地的 DNS条目, 如果没有匹配的记录, 隧道网关设备 发起 IPv4 DNS请求,以自身的 IPv4或 IPv6地址发送给网络侧的 IPv4或 IPv6 DNS服务器,如果通过 IPv4地址发送,发送的 DNS请求是通过 IPv6封装过 的数据, 互联网络透明传递相关数据, DS-LITE网关获得 IPv4的 DNS记录 后,回应客户端的 IPv4 DNS请求。如果是通过 IPv4地址发送,则发送的 DNS 请求时不用进行封装, 直接通过 IPv4网络达到 IPv4 DNS服务器。
实施例 3
本实施例中, 使用自动控制服务器提供 DNS Server 的地址配置, 对于 DS-LITE或 6rd的隧道网关设备, 使用相同的配置方式完成网络侧 DNS服 务器的地址配置。
DS-LITE 或 6rd 隧道网关设备通过管理协议分配隧道内层业务的网络 DNS server地址, 管理协议包括 TR069协议, 隧道网关设备获得了相应的隧 道内层业务的网络 DNS server地址后, 隧道网关设备将隧道内层业务的网络 的 DNS server地址发送给客户端, 一般是在协商 IP地址的过程中, 隧道网关 设备将相关的 DNS Server地址信息带给客户端。
客户端发起 DNS请求后,达到隧道网关设备,隧道网关设备不识别 DNS 请求, 直接封装进外层隧道, 透传客户端发出的 DNS请求给远端的 DNS server, 将 DNS server返回的 DNS响应透传给客户端, 隧道网关设备不参与 DNS信息的交互控制, 只进行透明转发。
对于 DS-LITE, 隧道外层是 IPv6封装, 内层是 IPv4数据;
对于 6rd, 隧道外层是 IPv4封装, 内层是 IPv6数据。
DS-LITE的情况下,隧道内层业务的网络 DNS server地址是 IPv4的; 6rd 的情况下, 隧道内层业务的网络 DNS server地址是 IPv6的。
本发明实施方式还提供一种隧道网关设备, 所述隧道网关设备设置为: 接收自动控制服务器通过管理协议配置的隧道内层业务网络的 DNS服 务器地址; 以及,
将自身地址作为 DNS (域名系统)服务器的地址发送给客户端, 或者, 将所述 DNS服务器地址发送给客户端。
其中, 所述隧道网关设备还设置为: 接收所述客户端的 DNS请求, 从本 地或者所述 DNS服务器获取对应的 IP地址信息, 返回所述对应的 IP地址信 息给所述客户端。
其中,所述隧道网关设备设置为根据如下方式从本地或者所述 DNS服务 器获取对应的 IP地址信息:
接收到所述 DNS请求后, 查找本地保存的 DNS条目, 当本地存在匹配 的 DNS条目时, 根据所述匹配的 DNS条目获取所述对应的 IP地址信息; 当 本地不存在匹配的 DNS条目时, 从配置的所述隧道内层业务网络的 DNS服 务器获取所述匹配的 DNS条目, 根据所述匹配的 DNS条目获取所述对应的 IP地址信息。
如果隧道网关设备本地不保存 DNS条目, 隧道网关设备在收到 DNS请 求后即向 DNS服务器获取匹配的 DNS条目, 根据所述匹配的 DNS条目获 取所述对应的 IP地址信息。
其中, 所述隧道网关设备还设置为: 保存从所述 DNS服务器获取的所述 DNS条目, 以及, 在保存所述 DNS条目时, 如果本地 DNS条目记录已满, 其中, 所述隧道网关设备还设置为: 接收所述客户端的 DNS请求, 将所 述 DNS请求透明转发给所述 DNS服务器, 将 DNS服务器返回的 IP地址信 息透明转发给所述客户端。
其中, 所述隧道网关设备支持轻量级双栈 ( DS-LITE )和 /或 IPv6快速部 署(6rd )技术。
其中, 所述管理协议为 TR069 协议或其他终端控制协议。
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。
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。
工业实用性
上述实施方式给出了不依赖于地址协议的 DNS server的分配方法和客户 端获得 DNS的方法, 通过管理协议配置 DNS Server的地址可以统一配置方 式, 网关緩存相应的 DNS条目并回应客户端发出的 DNS请求, 减少了客户 端发给远端 DNS server的请求数量。

Claims

权 利 要 求 书
1、 一种隧道网关设备, 所述隧道网关设备设置为:
接收自动控制服务器通过管理协议配置的隧道内层或外层业务网络的域 名系统 ( DNS )服务器地址; 以及,
将自身地址作为 DNS服务器的地址发送给客户端, 或者, 将所述 DNS 服务器地址发送给客户端。
2、 如权利要求 1所述的设备, 其中, 所述隧道网关设备还设置为: 接收 所述客户端的 DNS请求,从本地或者所述 DNS服务器获取所述 DNS请求对 应的 IP地址信息, 返回所述对应的 IP地址信息给所述客户端。
3、 如权利要求 2所述的设备, 其中,
所述隧道网关设备是设置为根据如下方式从本地或者所述 DNS服务器 获取所述 DNS请求对应的 IP地址信息:
接收到所述 DNS请求后, 查找本地保存的 DNS条目, 当本地存在匹配 的 DNS条目时, 根据所述匹配的 DNS条目获取所述对应的 IP地址信息; 当 本地不存在匹配的 DNS条目时, 从配置的所述 DNS服务器获取所述匹配的 DNS条目, 根据所述匹配的 DNS条目获取所述对应的 IP地址信息; 或者, 接收到所述 DNS请求后,从配置的所述 DNS服务器获取匹配的 DNS条 目, 根据所述匹配的 DNS条目获取所述对应的 IP地址信息。
4、 如权利要求 3所述的设备, 其中,
所述隧道网关设备还设置为: 保存从所述 DNS服务器获取的所述 DNS 条目, 以及, 在保存所述 DNS条目时, 如果本地 DNS条目记录已满, 则根
5、 如权利要求 1所述的设备, 其中, 所述隧道网关设备还设置为: 接收 所述客户端的 DNS请求, 将所述 DNS请求透明转发给所述 DNS服务器, 将 所述 DNS服务器返回的 IP地址信息透明转发给所述客户端。
6、 如权利要求 1至 5任一所述的设备, 其中,
所述隧道网关设备支持轻量级双栈( DS-LITE )和 /或 IPv6快速部署( 6rd ) 技术。
7、 如权利要求 1至 5任一所述的设备, 其中,
所述管理协议为 TR069 协议或其他终端控制协议。
8、 一种获取域名系统(DNS ) 的方法, 包括:
自动控制服务器通过管理协议在所述隧道网关设备上配置隧道内层或外 层业务网络的 DNS服务器地址;
隧道网关设备将自身地址作为 DNS服务器的地址发送给客户端; 或者, 隧道网关设备将所述 DNS服务器地址发送给所述客户端。
9、 如权利要求 8 所述的方法, 其中, 当隧道网关设备将自身地址作为 DNS服务器的地址发送给客户端时, 所述方法还包括:
所述客户端向所述隧道网关设备发送 DNS请求;
所述隧道网关设备从本地或者所述 DNS服务器获取所述 DNS请求对应 的 IP地址信息, 返回所述对应的 IP地址信息给所述客户端。
10、 如权利要求 9所述的方法, 其中,
所述隧道网关设备获取所述 DNS请求对应的 IP地址信息的步骤包括: 所述隧道网关设备接收到所述 DNS请求后,查找本地保存的 DNS条目, 当本地存在匹配的 DNS条目时, 根据所述匹配的 DNS条目获取所述对应的 IP地址信息; 当本地不存在匹配的 DNS条目时,从配置的所述隧道内层或外 层业务网络的 DNS服务器获取所述匹配的 DNS条目, 根据所述匹配的 DNS 条目获取所述对应的 IP地址信息; 或者,
所述隧道网关设备接收到所述 DNS请求后, 从配置的所述 DNS服务器 获取匹配的 DNS条目, 根据所述匹配的 DNS条目获取所述对应的 IP地址信 息。
11、 如权利要求 10所述的方法, 所述方法还包括:
所述隧道网关设备保存从所述 DNS服务器获取的所述 DNS条目, 在保 存所述 DNS条目时, 如果本地 DNS条目记录已满, 则根据 DNS条目的存储 时间和 /或使用频度删除本地 DNS条目。
12、 如权利要求 8所述的方法, 其中, 当隧道网关设备将所述 DNS服务 器地址发送给客户端时, 所述方法还包括, 所述隧道网关设备接收所述客户 端的 DNS请求,将所述 DNS请求透明转发给所述 DNS服务器,将所述 DNS 服务器返回的 IP地址信息透明转发给所述客户端。
13、 如权利要求 8至 12任一所述的方法, 其中,
所述隧道网关设备支持轻量级双栈( DS-LITE )和 /或 IPv6快速部署( 6rd ) 技术。
14、 如权利要求 8至 12任一所述的方法, 其中,
所述管理协议为 TR069 协议或其他终端控制协议。
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