Yen-Chieh Wang joined Chunghwa Telecom Data Communications Business Group since 2009 and is the member of TWNOG. Currently, he is the senior IP operations engineer, responsible for the maintenance of Taiwan Internet Exchange service(TWIX) and HiNet international backbone. In the past few years, he has been dedicated himself to the development of TWIX and the improvement of backbone security such as the issues of RPKI , DDoS traffic mitigation, Routes Hijacking detection, and ect. He has excellent ISP backbone maintenance experience and the domain knowledge of IPv4 and IPv6 related affairs including peering negotiation, dual-stack network operation and network security. He is delighted to share his experience and interests of the IP network operation with people to promote the Internet development.