This book constitutes the refereed proceedings of the 9th International IFIP TC6 Networking Conference, NETWORKING 2010, held in Chennai, India, in May 2010. The 24 revised full papers and 9 work in progress papers were carefully reviewed and selected from 101 submissions for inclusion in the book. The papers cover a variety of research topics in the area of P2P and overlay networks; performance measurement; quality of service; ad hoc and sensor networks; wireless networks, addressing and routing; and applications and services.