Curelan Tech. Co., Ltd. established in June, 1999. We created our own netflow calculation method with unique mathematical algorithms and use the Linux Embedded Firmware as the mainly technology skill on our products. Our product: Flowviewer can receive the Netflow/sFlow with the sample rate 1:1 and does not need to use signatures to analyze or filter the amount of packets. It can detect the cyber-intrusions, such as port scan, SSH, RDP and worm ; It can also detect the cyber-attacks, such as UDP flood attack, DoS attack, DNS attack and NTP attack. The main technology of Flowviewer is the mathematical algorithms that we developed. It can sort those random packets according by the IP address. The Flowviewer will analyze the collective Netflow every five minute and can distinguish it is cyber-attack or not within 1 second. If it is anomalous traffic, the Flowviewer will automatically start the blocking function.