WO2023040366A1 - 一种基于icmp的vpn加速通道网络质量探测系统 - Google Patents

一种基于icmp的vpn加速通道网络质量探测系统 Download PDF

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WO2023040366A1
WO2023040366A1 PCT/CN2022/097342 CN2022097342W WO2023040366A1 WO 2023040366 A1 WO2023040366 A1 WO 2023040366A1 CN 2022097342 W CN2022097342 W CN 2022097342W WO 2023040366 A1 WO2023040366 A1 WO 2023040366A1
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acceleration
network quality
channel
icmp echo
icmp
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PCT/CN2022/097342
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French (fr)
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宋歌
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天翼数字生活科技有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/5003—Managing SLA; Interaction between SLA and QoS
    • H04L41/5009—Determining service level performance parameters or violations of service level contracts, e.g. violations of agreed response time or mean time between failures [MTBF]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/12—Network monitoring probes

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  • the invention relates to the field of the Internet, in particular to a system and method for detecting the network quality of a VPN acceleration channel based on the Internet control message protocol ICMP.
  • Acceleration service providers that provide application acceleration services often need to detect and monitor the network quality of the acceleration channel, and users also need to know the network quality of the acceleration channel.
  • the network quality detection in the prior art usually adopts the packet capture method of the TCP protocol stack, which is only for the detection of the traffic actually used by the user, and cannot detect the packet loss rate and average jitter data of the channel. Such network quality detection is incomplete and inaccurate.
  • VPN acceleration channel network quality detection system and method which can detect more network quality parameters such as delay, packet loss rate, and average jitter in time, and help acceleration service providers discover network abnormalities of the acceleration channel in time and guide capacity expansion. , and at the same time display comprehensive information on the network quality of the acceleration channel to the user in real time.
  • the present invention can detect more network quality parameters such as time delay, packet loss rate, average jitter, etc. by actively sending ICMP packets to the VPN service node by the gateway.
  • the present invention can avoid the influence of other network factors on the detection result, compared with sending two packets to the accelerated channel and the non-accelerated channel successively.
  • the invention can detect the network quality between the real-time gateway and the VPN node server, help the acceleration service provider to discover the network abnormality of the acceleration channel in time and guide the acceleration service provider to expand the VPN channel in time, and on the other hand, can improve the network quality of the acceleration channel in real time Displayed to the user, thereby enhancing the user's perception of the network quality of the acceleration channel.
  • the management platform sends the detection start instruction information to the gateway acceleration plug-in.
  • the gateway uses the iptables tool to perform TOS settings on the two ICMP Echo Request messages, and the routing management module periodically routes the two ICMP Echo Request requests according to policy routing The message is forwarded to the accelerated channel and the non-accelerated channel at the same time, and the delay, packet loss rate, and average jitter of the accelerated channel and the non-accelerated channel are calculated through the ICMP Echo Response response message.
  • the gateway acceleration plug-in reports the delay, packet loss rate, and average jitter data of the acceleration channel and non-acceleration channel to the management platform.
  • the data is forwarded to the user APP, and the network quality of the acceleration channel is displayed to the user in real time.
  • An ICMP-based VPN acceleration channel network quality detection method of the present invention includes: sending a start detection instruction, the instruction includes two ICMP Echo Request request messages, a time period t1 for sending ICMP data packets, and a time period t2 for calculating network quality , the time period t3 for the gateway acceleration plug-in to report data to the management platform; set the IP headers of the two ICMP Echo Request request messages to different TOS fields; based on policy routing, periodically set the two ICMP Echo Request The Request message is sent to the accelerated channel and the non-accelerated channel at the same time; the ICMP Echo Response response message returned through the accelerated channel and the non-accelerated channel is received respectively; the delay of the accelerated channel and the non-accelerated channel is calculated based on the ICMP Echo Response response message.
  • Packet loss rate and average jitter where the delay is the time difference between sending the ICMP Echo Request request message and receiving the ICMP Echo Response response message, and the packet loss rate is timed out or not delivered in the time period t2 for calculating the network quality
  • the ratio of the number of ICMP Echo Response response packets to the total number of ICMP Echo Request packets, the average jitter is the average value of all packet jitters, and the jitter of each packet is the difference between the delay of the packet in the current detection cycle and the previous detection The difference between the delays of the packets in the cycle; and monitoring the network quality of the acceleration channel based on the calculation results.
  • the method of the present invention further includes sending an instruction to start detection after receiving the user's self-service detection request, and displaying the network quality of the acceleration channel to the user in real time.
  • the ICMP-based VPN acceleration channel network quality detection system of the present invention includes a management platform, a gateway acceleration plug-in, and a VPN node server, and an acceleration channel is established between the gateway acceleration plug-in and the VPN node server, wherein:
  • the management platform is communicatively connected with the gateway acceleration plug-in, and is used to send to the gateway acceleration plug-in an instruction to start detection including two ICMP Echo Request request messages, and receive the calculated acceleration channel and non-acceleration channel delay from the gateway acceleration plug-in , packet loss rate, average jitter, used to monitor network quality;
  • the gateway acceleration plug-in further includes a TOS setting module, a routing management module, and a network quality parameter calculation module, wherein: the TOS setting module is used to set the IP headers of two ICMP Echo Request request messages to different TOS fields; The module periodically sends two set ICMP Echo Request request messages to the VPN node server through the accelerated channel and the non-accelerated channel at the same time; and the network quality parameter calculation module is based on the VPN node server through the accelerated channel and the non-accelerated channel respectively.
  • the two returned ICMP Echo Response response messages calculate the delay, packet loss rate, and average jitter of the accelerated channel and the non-accelerated channel.
  • the system of the present invention further includes a client connected to the management platform and communication ground, which is used for initiating a self-service detection request to the management platform and receiving network quality monitoring information of the acceleration channel from the management platform.
  • Fig. 1 is the flow chart of the VPN acceleration channel network quality detection method based on Internet Control Message Protocol ICMP of the present invention
  • Fig. 2 is a block diagram of the ICMP-based VPN acceleration channel network quality detection system of the present invention.
  • each block in a flowchart or block diagram may represent a module, program segment, or part of code that includes one or more Executable instructions.
  • Fig. 1 is a flow chart of the method for detecting the network quality of the VPN acceleration channel of the present invention.
  • step S110 start the network quality detection.
  • This start can be initiated by the management platform, or the user initiates a self-service detection request through the client APP, and after sending the request to the management platform, the management platform starts it.
  • step S120 the management platform sends an instruction to start detection to the gateway acceleration plug-in.
  • the instruction includes the time period t1 for sending ICMP data packets, the time period t2 for calculating delay, packet loss rate, and average jitter, and the time period t3 for the gateway acceleration plug-in to report data to the management platform.
  • the command includes two ICMP Echo Request request messages.
  • step S130 the gateway acceleration plug-in sets the TOS field of the ICMP Echo Request message.
  • the routing management module judges the TOS field of the IP header of the ICMP Echo Request request message through policy routing (a more flexible packet routing and forwarding mechanism than routing based on the target network), and periodically changes the TOS field of the IP header Two different ICMP Echo Request request messages are sent to the VPN node server through the accelerated channel and the non-accelerated channel at the same time.
  • the two ICMP Echo Response response messages returned by the VPN node server via the accelerated channel and the non-accelerated channel are returned to the gateway acceleration plug-in.
  • the gateway acceleration plug-in calculates the delay, packet loss rate, and average jitter of the acceleration channel and the non-acceleration channel through the ICMP Echo Request message and the ICMP Echo Response message. details as follows:
  • Latency the time difference between sending the ICMP Echo Request request message and receiving the ICMP Echo Response response message
  • Packet loss rate R lost In the time period t2, the ratio of the number of overtime or undelivered ICMP Echo Response response messages P error to the total number of ICMP Echo Request request messages P all , the calculation formula is:
  • Average jitter J avg the jitter J i is the difference between the delay D i of the packet in the current detection period and the delay D i-1 of the packet in the previous detection period.
  • the average jitter is the average value of all packet jitters, and the calculation formula is:
  • n is an integer, indicating the number of detection periods
  • i is an integer ranging from 1 to n, indicating the ith detection period.
  • the gateway acceleration plug-in reports the calculated delay, packet loss rate, and average jitter of the accelerated channel and the non-accelerated channel to the management platform.
  • the management platform monitors the network quality of the acceleration channel according to the delay, packet loss rate, and average jitter of the acceleration channel and non-acceleration channel, and detects abnormalities in time. At the same time, the information is forwarded to the user APP for display to the user, so as to enhance user experience. The perception of the network quality of the accelerated channel.
  • Fig. 2 is a block diagram of the VPN acceleration channel network quality detection system of the present invention.
  • the system includes a management platform 220 , a gateway acceleration plug-in 230 and a VPN node server 240 .
  • the management platform 220 is communicatively connected with the gateway acceleration plug-in 230, and is used to send an instruction to start detection to the gateway acceleration plug-in 230, and receive the calculated delay, packet loss rate, and average Network quality parameters such as jitter.
  • the gateway acceleration plug-in 230 includes a TOS setting module 231 , a route management module 233 , and a network quality parameter calculation module 232 .
  • the gateway acceleration plug-in 230 is communicatively connected with the VPN node server 240, and an acceleration channel is established therebetween.
  • the TOS setting module 231 in the gateway acceleration plug-in 230 carries out TOS field setting to two ICMP Echo Request request messages.
  • the route management module 233 periodically sends two ICMP Echo Request request messages after TOS setting to the VPN node server via the accelerated channel and the non-accelerated channel respectively according to the policy routing.
  • the network quality parameter calculation module 232 is based on the two ICMP Echo Response response messages returned by the VPN node server respectively via the server acceleration channel and the non-acceleration channel to calculate the time delay, packet loss rate, and average jitter of the acceleration channel and the non-acceleration channel. quality parameters.
  • the system may also include a client 210 for the user.
  • the user initiates a self-service detection request to the management platform 220 through the APP of the client 210 , and also receives network quality monitoring information of the acceleration channel from the management platform 220 .
  • the invention actively sends ICMP packets to the VPN service node through the gateway acceleration plug-in, and can detect more network quality parameters such as time delay, packet loss rate, and average jitter; by simultaneously sending two ICMP packets to the acceleration channel and the non-acceleration channel The channel can avoid the impact of other network factors on the detection results.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

本发明公开了一种基于ICMP的VPN加速通道网络质量探测系统和方法。该系统中的管理平台发送包括两个ICMP Echo Request请求报文的开始探测的指令，经由TOS设置模块将这两个请求报文的IP头部设置为不同的TOS字段后，由路由管理模块周期性地将它们同时分别经由加速通道和非加速通道发送到VPN节点服务器，网络质量参数计算模块基于VPN节点服务器分别经由加速通道和非加速通道返回的两个ICMP Echo Response回应报文计算加速通道和非加速通道的时延、丢包率、平均抖动，用于监控网络质量。本发明的网络质量探测系统和方法，能够更准确及时地探测到更为全面的网络质量参数，有助于及时发现网络异常。

Description

一种基于ICMP的VPN加速通道网络质量探测系统 技术领域
本发明涉及互联网领域，尤其涉及一种基于因特网控制报文协议ICMP的VPN加速通道网络质量探测系统和方法。
背景技术
在互联网实时应用中，经常会发生网络时延、丢包、抖动等问题。大部分应用对此类问题非常敏感，若频繁发生会影响系统的正常运行和业务的正常开展，导致用户体验较差。为此，应用加速技术开始被广泛使用。其中主要的方式是通过VPN技术建立加速通道来保障网络质量，实现低时延、零丢包、低抖动的应用要求。
提供应用加速业务的加速服务提供商往往需要对加速通道网络质量进行探测、监控，用户也需要了解加速通道网络质量。目前现有技术中的网络质量探测通常采用TCP协议栈抓包方式，这仅仅是针对用户实际使用的流量进行的探测，无法探测通道的丢包率和平均抖动数据。这样的网络质量探测不全面、不准确。
因此，需要有一种VPN加速通道网络质量探测系统和方法，能够及时探测到时延、丢包率、平均抖动等更多的网络质量参数，帮助加速服务商及时发现加速通道的网络异常并指导扩容，同时实时向用户展示加速通道网络质量的全面的信息。
发明内容
提供本发明内容以便以简化形式介绍将在以下详细描述中进一步描述的一些概念。本发明内容并不旨在标识出所要求保护的主题的关键特征或必要特征；也不旨在用于确定或限制所要求保护的主题的范围。
本发明通过由网关主动向VPN服务节点发送ICMP包的方式，能够 探测到时延、丢包率、平均抖动等更多的网络质量参数。此外，本发明通过同时发送两个ICMP包至加速通道和非加速通道，较之先后发送两个包到加速通道和非加速通道，能够避免其他网络因素影响对探测结果的影响。本发明能够检测实时网关至VPN节点服务器间的网络质量，帮助加速服务商及时发现加速通道的网络异常并指导加速服务商及时对VPN通道进行扩容，另一方面能够将加速通道的网络质量实时地展示给用户，从而增强用户对加速通道网络质量的感知。
具体而言，在通过用户使用其APP或通过在管理平台启动VPN通道网络质量探测后，管理平台向网关加速插件发送开始探测指令信息。为提供给用户更直观的对比，同时避免其他网络因素影响，网关通过iptables工具对两个ICMP Echo Request请求报文进行TOS设置，路由管理模块根据策略路由，周期性地将两个ICMP Echo Request请求报文同时分别转发至加速通道和非加速通道，并通过ICMP Echo Response回应报文来计算加速通道和非加速通道的时延、丢包率、平均抖动。网关加速插件将加速通道和非加速通道的时延、丢包率、平均抖动数据上报给管理平台，管理平台依据此数据来监控加速通道的网络质量，及时发现加速通道的网络异常；同时管理平台将数据转发至用户APP，将加速通道的网络质量实时地展示给用户。
本发明的一种基于ICMP的VPN加速通道网络质量探测方法，包括：发送开始探测指令，指令包括两个ICMP Echo Request请求报文、发送ICMP数据包的时间周期t1、计算网络质量的时间周期t2、网关加速插件向管理平台上报数据的时间周期t3；将两个ICMP Echo Request请求报文的IP头部设置为不同的TOS字段；是基于策略路由周期性地将经设置后的两个ICMP Echo Request请求报文同时分别发送到加速通道和非加速通道；接收分别通过加速通道和非加速通道返回的ICMP Echo Response回应报文；基于ICMP Echo Response回应报文计算加速通道和非加速通道时延、丢包率、平均抖动，其中，时延为发送ICMP Echo Request请求报文至收到ICMP Echo Response回应报文的时间差，丢包率为在计算网络质量的时间周期t2中，超时或未送达的ICMP Echo Response回应报文数量在总的 ICMP Echo Request请求报文数量中占的比率，平均抖动为所有包抖动的平均值，每个包抖动为当前探测周期里包的时延与上一个探测周期里包的时延之间的差值；以及基于计算结果监控加速通道的网络质量。
本发明的方法进一步包括在接收到用户的自助探测请求后发送开始探测指令，以及将加速通道的网络质量实时向用户展示。
本发明的基于ICMP的VPN加速通道网络质量探测系统，包括管理平台、网关加速插件、和VPN节点服务器，网关加速插件和VPN节点服务器之间建立有加速通道，其中：
管理平台和网关加速插件通信地连接，用于向网关加速插件发送包括两个ICMP Echo Request请求报文的开始探测的指令，并从网关加速插件接收计算所得的加速通道和非加速通道的时延、丢包率、平均抖动，用于监控网络质量；
网关加速插件中进一步包括TOS设置模块、路由管理模块、和网络质量参数计算模块，其中：TOS设置模块用于将两个ICMP Echo Request请求报文的IP头部设置为不同的TOS字段；路由管理模块周期性地将经设置后的两个ICMP Echo Request请求报文同时分别经由加速通道和非加速通道发送到VPN节点服务器；以及网络质量参数计算模块基于VPN节点服务器分别经由加速通道和非加速通道返回的两个ICMP Echo Response回应报文计算加速通道和非加速通道的时延、丢包率、平均抖动。
本发明的系统进一步包括与管理平台和通信地连接的客户端，用于向管理平台发起自助探测请求，同时也从管理平台接收加速通道的网络质量监控信息。
通过阅读下面的详细描述并参考相关联的附图，这些及其他特点和优点将变得显而易见。应该理解，前面的概括说明和下面的详细描述只是说明性的，不会对所要求保护的各方面形成限制。
附图说明
以下将通过参考附图中示出的具体实施例来对本发明进行更具体描述。
图1是本发明的基于因特网控制报文协议ICMP的VPN加速通道网络质量探测方法的流程图；
图2是本发明的基于因特网控制报文协议ICMP的VPN加速通道网络质量探测系统的框图。
附图中的流程图和框图显示了根据本申请的实施例的系统、方法可能实现的体系架构、功能和操作。在这点上，流程图或框图中的每个方框可以代表一个模块、程序段或代码的一部分，所述模块、程序段或代码的一部分包含一个或多个用于实现规定的逻辑功能的可执行指令。
具体实施方式
以下将通过参考附图中示出的具体实施例来对本发明进行更具体描述。通过阅读下文具体实施方式的详细描述，本发明的各种优点和益处对于本领域普通技术人员将变得清楚明了。然而应当理解，可以以各种形式实现本发明而不应被这里阐述的各实施方式所限制。提供以下实施方式是为了能够更透彻地理解本发明。除非另有说明，本申请使用的技术术语或者科学术语应当为本申请所属领域技术人员所理解的通常意义。
图1是本发明的VPN加速通道网络质量探测方法的流程图。
在步骤S110，启动网络质量探测，这个启动可以是管理平台发起的，也可以是用户通过其客户端APP发起自助探测请求，将该请求发送给管理平台后，再由管理平台启动。
在步骤S120，管理平台将开始探测的指令发送到网关加速插件。指令中包含发送ICMP数据包的时间周期t1，计算时延、丢包率、平均抖动的时间周期t2，网关加速插件向管理平台上报数据的时间周期t3。指令包括两个ICMP Echo Request请求报文。
在步骤S130，网关加速插件对ICMP Echo Request报文进行服务类型字段TOS设置。
为提供更直观的对比，同时避免其他网络因素影响，网关加速插件通过iptables工具将两个ICMP Echo Request请求报文的IP头部设置为不同的TOS字段(setsockopt(sockfd，IPPROTO_IP，IP_TOS，(char*)&tos， sizeof(tos)))。例如将其中一个ICMP Echo Request报文IP头部的TOS字段设置为0X08(int tos＝0x08)，另一个ICMP Echo Request报文IP头部的TOS字段设置为0X09(int tos＝0x09)。
在S140，路由管理模块通过策略路由(比基于目标网络进行路由更加灵活的数据包路由转发机制)，判断ICMP Echo Request请求报文IP头部的TOS字段，周期性地将IP头部的TOS字段不同的两个ICMP Echo Request请求报文同时分别经由加速通道和非加速通道发送到VPN节点服务器。例如将IP头部的TOS字段为0X08的ICMP Echo Request请求报文经由加速通道发送到VPN节点服务器(ip ru add from all tos 0x08 loopup main ip ru add from all lookup****)，将IP头部的TOS字段为0X09的ICMP Echo Request请求报文经由非加速通道发送到VPN节点服务器。
在S150，VPN节点服务器分别经由加速通道和非加速通道返回的两个ICMP Echo Response回应报文返回给网关加速插件。
在S160，网关加速插件通过ICMP Echo Request请求报文、ICMP Echo Response回应报文计算加速通道和非加速通道的时延、丢包率、平均抖动等。具体如下：
时延：发送ICMP Echo Request请求报文至收到ICMP Echo Response回应报文的时间差；
丢包率R lost：在时间周期t2中，超时或未送达的ICMP Echo Response回应报文数量P error在总的ICMP Echo Request请求报文数量P all中占的比率，计算公式为：
Figure PCTCN2022097342-appb-000001
平均抖动J avg：抖动J i为当前探测周期里包的时延D i与上一个探测周期里包的时延D i-1之间的差值。平均抖动为所有包抖动的平均值，计算公式为：
Figure PCTCN2022097342-appb-000002
其中n为整数，表示探测周期的数量，i为1～n的整数，表示第i 个探测周期。
在S170，网关加速插件将计算所得的加速通道和非加速通道的时延、丢包率、平均抖动等上报给管理平台。
在S180，管理平台根据加速通道和非加速通道的时延、丢包率、平均抖动等监控加速通道的网络质量，及时发现异常，同时也将这些信息转发到用户APP向用户展示，以增强用户对加速通道网络质量的感知。
图2是本发明的VPN加速通道网络质量探测系统的框图。
该系统包括管理平台220、网关加速插件230和VPN节点服务器240。
管理平台220和网关加速插件230通信地连接，用于向网关加速插件230发送开始探测的指令，并从网关加速插件230接收计算所得的加速通道和非加速通道的时延、丢包率、平均抖动等网络质量参数。
网关加速插件230中包括TOS设置模块231、路由管理模块233、和网络质量参数计算模块232。网关加速插件230与VPN节点服务器240通信地连接，其间建立了加速通道。
网关加速插件230中的TOS设置模块231对两个ICMP Echo Request请求报文进行TOS字段设置。
路由管理模块233根据策略路由，周期性地将经TOS设置后的两个ICMP Echo Request请求报文同时分别经由加速通道和非加速通道发送到VPN节点服务器。
网络质量参数计算模块232，基于VPN节点服务器分别经由服务器加速通道和非加速通道分别返回的两个ICMP Echo Response回应报文计算加速通道和非加速通道的时延、丢包率、平均抖动等网络质量参数。
该系统还可以包括用户的客户端210。用户通过该客户端210的APP向管理平台220发起自助探测请求，同时也从管理平台220接收加速通道的网络质量监控信息。
本发明通过网关加速插件主动向VPN服务节点发送ICMP包，能够探测到时延、丢包率、平均抖动等更多的网络质量参数；通过同时将两个ICMP分别发送包至加速通道和非加速通道，能够避免其他网络因素影响 对探测结果的影响。
以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围，其均应涵盖在本申请的权利要求和说明书的范围当中。

Claims (10)

  1. 一种基于ICMP的VPN加速通道网络质量探测方法，包括：
    发送开始探测指令，所述指令包括两个ICMP Echo Request请求报文；
    将所述两个ICMP Echo Request请求报文的IP头部设置为不同的TOS字段；
    周期性地将经设置后的两个ICMP Echo Request请求报文同时分别发送到加速通道和非加速通道；
    接收分别通过所述加速通道和所述非加速通道返回的ICMP Echo Response回应报文；
    基于所述ICMP Echo Response回应报文计算所述加速通道和所述非加速通道时延、丢包率、平均抖动；以及
    基于计算结果监控所述加速通道的网络质量。
  2. 如权利要求1所述的方法，其特征在于，所述指令包括发送ICMP数据包的时间周期t1，计算网络质量的时间周期t2，网关加速插件向管理平台上报数据的时间周期t3。
  3. 如权利要求1所述的方法，其特征在于，所述时延为发送ICMP Echo Request请求报文至收到ICMP Echo Response回应报文的时间差。
  4. 如权利要求1所述的方法，其特征在于，所述丢包率为在计算网络质量的时间周期t2中，超时或未送达的ICMP Echo Response回应报文数量在总的ICMP Echo Request请求报文数量中占的比率。
  5. 如权利要求1所述的方法，其特征在于，所述平均抖动为所有包抖动的平均值，每个包抖动为当前探测周期里包的时延与上一个探测周期里包的时延之间的差值。
  6. 如权利要求1所述的方法，其特征在于，周期性地将两个ICMP Echo Request请求报文同时分别发送到加速通道和非加速通道是基于策略路由进行的。
  7. 如权利要求1所述的方法，其特征在于，所述方法进一步包括在接收到用户的自助探测请求后发送开始探测指令，以及将所述加速通道的网络质量实时向所述用户展示。
  8. 一种基于ICMP的VPN加速通道网络质量探测系统，包括管理平台、网关加速插件、和VPN节点服务器，所述网关加速插件和所述VPN节点服务器之间建立有加速通道，其中：
    所述管理平台和所述网关加速插件通信地连接，用于向所述网关加速插件发送包括两个ICMP Echo Request请求报文的开始探测的指令，并从所述网关加速插件接收计算所得的加速通道和非加速通道的时延、丢包率、平均抖动，用于监控网络质量；
    所述网关加速插件中进一步包括TOS设置模块、路由管理模块、和网络质量参数计算模块，其中：
    所述TOS设置模块用于将所述两个ICMP Echo Request请求报文的IP头部设置为不同的TOS字段；
    所述路由管理模块周期性地将经设置后的两个ICMP Echo Request请求报文同时分别经由加速通道和非加速通道发送到所述VPN节点服务器；以及
    所述网络质量参数计算模块分别经由所述服务器加速通道和所述非加速通道分别返回的两个ICMP Echo Response回应报文计算所述加速通道和所述非加速通道的时延、丢包率、平均抖动。
  9. 如权利要求8所述的系统，其特征在于，进一步包括与所述管理平台和通信地连接的客户端，用于向所述管理平台发起自助探测请求，同时也从所述管理平台接收所述加速通道的网络质量监控信息。
  10. 如权利要求8所述的系统，其特征在于，
    所述时延为发送ICMP Echo Request请求报文至收到ICMP Echo Response回应报文的时间差；
    所述丢包率为在计算网络质量的时间周期中，超时或未送达的ICMP Echo Response回应报文数量在总的ICMP Echo Request请求报文数量中占的比率；以及
    所述平均抖动为所有包抖动的平均值，每个包抖动为当前探测周期里包的时延与上一个探测周期里包的时延之间的差值。
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