With a tremendous increase of Internet users, the Internet computing environments are getting more complicated along with the network management structure in order to support diverse traffic characteristics. A successful end-to-end realization of Grid services presumes well-defined QoS measuring framework in the service provider’s and customer’s networks. Most traditional network performance management systems utilize a passive measuring method based on SNMP, allowing an administrator to understand only network conditions. However, it is difficult for network managing systems that are based on a passive measuring method to accurately understand the situations surrounding time-varying networks. Our objective in this paper is to describes a Grid monitoring architecture based practical measuring framework for network performance measurement. It includes concepts as well as step-by-step procedures of an active measuring method for measuring performance of any section at any time.