News for and about the Internet2 community

["Lauren Rotman" <>]

New Internet2 Land Speed Records Set 

International Team Lead by the University of Tokyo Sets Two New Consecutive
IPv6 Records; Latest Record Surpasses IPv4 Performance

Arlington, VA - April 24, 2007 - Internet2 today at its annual Spring Member
Meeting announced that an international team led by the University of Tokyo
has set two consecutive new Internet2 Land Speed Records (I2-LSR) in the
IPv6 single and multi-stream categories. These records mark the ninth and
tenth time a University of Tokyo-lead team has achieved an Internet2 Land
Speed record. As an open and ongoing competition for the highest-bandwidth,
end-to-end networks, Internet2 LSR awards represent the fastest rate at
which data is transferred multiplied by the distance traveled.

For the first set of IPv6 records, a team from the University of Tokyo, WIDE
Project, NTT Communications, JGN2, SURFnet, CANARIE, Pacific Northwest
Gigapop and other institutions collaborated to create a network path over
30,000 kilometers in distance, crossing 6 international networks - over 3/4
the circumference of the Earth. In doing so, the team successfully
transferred data in the single and multi-stream categories at a rate of 7.67
Gbps which is equal to 230,100 terabit-meters per second (Tb-m/s).  This
record setting attempt leveraged standard TCP to achieve the new mark. 

The next day, the team used a modified version of TCP to achieve an even
greater record. Using the same 30,000 km path, the network was able to
achieve a throughput of 9.08 Gbps which is equal to 272,400 Tb-m/s for both
the IPv6 multi and single stream categories. In doing so, the team surpassed
the current IPv4 records, proving that IPv6 networks are able to provide the
same, if not better, performance as IPv4.

Dr. Kei Hiraki, professor at the University of Tokyo and LSR team leader
said, "These records are final for the 10Gbps network era because they
represent more than 98% of the upper limit of network capacity. Through
collaboration by a number of institutions, we have demonstrated the ability
to overcome the distance and achieve this newest mark."

For more information about these record-setting attempt, see 
http://data-reservoir.adm.s.u-tokyo.ac.jp/lsr-200612-01/
and
http://data-reservoir.adm.s.u-tokyo.ac.jp/lsr-200612-02/

Details of past winning entries, complete rules, submission guidelines, and
additional details are available at: http://lsr.internet2.edu/

Media Contact:
Lauren Rotman
Internet2