Browsing by Author "Hsu, Huai-Wen"

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An Autoblocking Mechanism for Firewall Service
(2017-01-01)
Fu, Shan-Jung
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Hsu, Huai-Wen
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Kao, Yi-Chih
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Tsai, Shi-Chun
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Tseng, Chien-Chao
A distributed denial-of-service (DDoS) attack could cause the incoming connections per second exceeding the capacity of the firewall device and the network system might be paralyzed. By analyzing the syslog of firewall, we design an effective mechanism to block malicious source IPs automatically from the router. We have undergone a field trial on campus for two years. The collected data shows that our approach significantly reduces suspicious traffic and improve the stability of overall network service.
Deploying WLAN service with OpenFlow technology
(2017-05-01)
Hsu, Huai-Wen
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Huang, Kuei-Li
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Kao, Yi-Chih
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Tsai, Shi-Chun
;
Lin, Yi-Bing
In this paper, we proposed a feasible software-defined networking (SDN) wireless local area network (WLAN) solution that leverages OpenFlow technique and provides affordable centralized WLAN service without the proprietary restrictions of centralized thin access point WLAN architecture. On the basis of an SDN-enabled WLAN architecture with fat access points, we implement and deploy a wireless network test bed, where network administrators can exploit the extensibility and flexibility of OpenFlow-based SDN switches and controller. Service providers can develop customized application modules and required features. We build our system with open sources and commercial off-the-shelf hardware and develop a mechanism to control wireless bandwidth. Field experimental results show that our SDN wireless bandwidth control application can effectively manage bandwidth in a dynamic and flexible way via the SDN WLAN.