Welcome to i-Path Project

About i-Path

i-Path project explores how to provide a visibility inside the Internet to end systems.

The goal of i-Path is to realize visibility between an end-to-end Internet path with "hop-by-hop" granularity, and also, to satisfy disclosure policies among all stake holders along the path, i.e., sender, access network providers, backbones, and receiver.

i-Path project is supported as a part of the NeW Generation Network research and development funded by NICT, Japan.

Background and Motivation

Objective of Project

i-Path project is developing a protocol stack implementation to provide the visibility of end-to-end network path. We evaluate the feasibility of our approach using the implementation on R&D testbed networks, such as, JGN2+. And, with releasing our implementation, we would like to facilitate other research activities sharing the similar cross-layer ideas.

Project Members

* Waseda University

  • Shigeki Goto/Ichiro Murase/Akihiro Shimoda


  • Katsushi Kobayashi (now moved to U-Tokyo.)

i-Path resources

* i-Path implementation is working on FreeBSD, Mac OS X, and Linux. Kernel APIs and sample applications are available

  • You can access the latest source from gitgub as:
    git clone https://github.com/ikob/i-Path.git

i-Path related handouts and presentations

* i-Path: toward visibility into what is happening inside networks, 2009

* Geographical trace snapshot of our i-Path testbed


i-Path related papers

* D. Mochinaga, K. Kobayashi, R. Yamada, S. Goto, A. Shimoda, and I. Murase, “i-Path: Improving Path Visibility for the Future Internet” , 12th IEEE/IPSJ International Symposium on Applications and the Internet, July, 2012

* D. Mochinaga, K. Kobayashi, S. Goto, A. Shimoda and I. Murase, Collecting Information to Visualize Network Status, p1-4, 28th APAN Network Research Workshop, Kuala Lumpur, Malaysia, 2009

* K. Kobayashi, Better End-to-End Visibility Leads Better Networks, in proc. 3rd International Conference on Future Internet Technologies (CFI08), Seoul, Korea, 2008

* K. Nakauchi and K. Kobayashi, An explicit router feedback framework for high bandwidth-delay product networks, Computer Networks, 51, 1833-1846, Elsevier, 2007

Videos (Speaking in Japanese)

* MacOSX / Java demo

* Android demo