Network Monitor để kiểm tra các giá trị DSCP trong tiêu đề IP. Trong hình, thông báo rằng IPv4 chọn gói tin có giá trị DSCP 10 (số lượng lớn lưu lượng truy cập). Vì vậy, bạn có thể sử dụng Network Monitor để xác minh rằng các giá trị DSCP đang được áp dụng và thực hiện xử lý sự cố chi tiết. | 142 Windows Server 2008 Networking and Network Access Protection NAP Network Monitor to examine the DSCP values in the IP header. In the figure notice that the selected IPv4 packet has a DSCP value of 10 bulk traffic . Therefore you can use Network Monitor to verify that DSCP values are being applied and to perform detailed troubleshooting. Figure 5-8 Viewing the DSCP value in Network Monitor You can also use Network Monitor to determine the TCP receive window being used which you can configure by following the instructions in How to Configure System-Wide QoS Settings earlier in this chapter. After capturing traffic examine the Window value in the TCP header as shown in Figure 5-9. Windows will dynamically adjust this value but it should always be below the value shown in Table 5-3 for the configured setting. To download Network Monitor visit http downloads and search for Network Monitor. For detailed instructions on how to use Network Monitor to capture and analyze network communications refer to the Help site. Third-Party Monitoring Tools Monitoring individual computers can provide some useful information about how QoS policies are being applied. However only by monitoring your network infrastructure can you develop a comprehensive view of your network performance and the impact of QoS policies. Contact your network infrastructure provider for information about monitoring tools that provide insight into QoS performance. You can also use third-party tools to monitor the performance of specific applications. For example several developers including Agilent and NetIQ offer software that monitors VoIP performance. If you are implementing QoS to provide VoIP use monitoring tools such as these to verify that you are meeting your performance requirements. If performance is low increase bandwidth reduce the amount of network traffic that QoS policies label as high priority or both. Chapter 5 Policy-Based Quality of Service 143 Figure 5-9 Viewing the TCP
