性能测试工具操作技能(高级)_LoadRunner技术分析.ppt

* * * * * * * * * * Some systems employ load balancing configurations to maximize overall speed and efficiency. Such systems typically use the IP address of the originating client to distribute a request. * Every IP packet is forwarded by hubs, routers, and web servers by means of a routing table. * Routers, like hubs and web servers, know where to send a packet of information by referencing the final destination in its internal routing table and retrieving the IP address of the packet’s next step. * The results of a web query must be forwarded by the web server back to the querys originator. The clients IP address is indexed in the web servers routing table. In the example above, the client at 00 sent a request to the web server (), and the request was passed along to the appropriate application and database servers. Their results were sent back to the web server, which looked up the originating clients IP address, 00, in its routing table. Here the web server found that packets to that client should be sent to router 3. * Load balancing systems also use the client IP address to direct queries. * Each request is sorted by IP address to a backend destination. In this example, requests from the three browsers were distributed to three different database servers based on their IP addresses. 路由器 数据库服务器 应用服务器 Web 服务器 Web服务器使用客户端的IP地址返回结果 客户端 00 3 22 5 10 91 00 3 9 91 12 98.2.2. 22 目标地址 下一节点 WEB服务器 路由表 这个数据包是来自于00 请求的相应包，下一节点应该送往哪儿？ 下一节点地址为3! 路由表和负载均衡系统如何使用IP地址？ 路由表 路由表通过查看目标IP地址，确定数据包的下一步 根据发送请求的IP地址，将某些请求指向特定的后台服务器 负载均衡系统 负载均衡系统依赖于客户端的IP地址 应用了IP欺骗的虚拟用户 8 00 来自于的请求要到到DB服务器1 来自于8的请求要到达DB服务器3 来自于00的请求要到达DB 服务器2 负载均衡系统 路由器 数据库服务器 应用服务器 Web服务器 虚拟用户一般来讲来源于一个IP地址 虚拟用户 在一个IP地址上的虚拟用户，不会对后台的路由器、应用服务器和数据库产生真实的压力。 负载均衡系统 路由器 数据库服务器 应用服务器 Web服务器 不太均衡的负载模型会引起不太确定的测试结果 示 例 Some response results may be exaggerated 虚拟用户会意想不到的失败很多 结合LoadRunenr实施IP欺骗 我是否需要 IP欺骗 IP欺骗的几个观点 需要，如果你的系统使用了IP依赖的负载均衡系统 我如何才能实施IP欺骗? IP欺骗的几个观点 我是否需要IP 欺骗? 需要，如果你的系统使用了IP依赖的负载均衡