Transcript plenaryt-5 - Internet Engineering Task Force

Update on the
Internet Research Task Force
Aaron Falk
IRTF Chair
IETF-73 – Minneapolis
IRTF Status
• Four Research Groups (RGs) are meeting this week
– Internet Congestion Control RG
– Delay Tolerant Networking RG
– Routing RG (Fri)
– Host Identity Payload RG (Fri)
– Mobility Optimizations RG
• Reviewing a rebooting Peer-to-Peer RG with the IAB
(tomorrow)
• IRSG composition is now public (on IRTF Chair
page)
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IRTF Status
• Finalized definition of the IRTF RFC Stream
– Enqueued at the RFC Editor
• 4 IRTF RFCs published
– 3 from DTNRG on Licklider Transmission Protocol
– NMRG on SNMP Measurements
• draft-irtf-asrg-dnsbl
– Lengthy thread on IETF list
– To be published as an IRTF RFC on current practice
– Will include Security Considerations reflecting IETF last call
comments
– Interest in IETF work on reputation services will be raised in
DKIM tomorrow
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A brief diversion into something
other than status…
2 minute intro to the
Delay-Tolerant Networking
Research Group
DTNRG
Slides courtesy of:
Kevin Fall, Intel Research
Stephen Farrell, Trinity College Dublin
Lloyd Wood, Cisco
Delay Tolerant Networking
RECEIVER APP
SENDER APP
USB
USB
NET
wireless
DTNAgent
NET
NET
CACHE
DTNAgent
Network
DTNAgent
NET
( DSL )
Multipath
Features
 Multi-party comms model
 Store-carry-forward of messages
 Extensible (URI-based) naming
 Supports multi-path routing and
caching with e2e disruptions
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Internet Stack
No significant
buffering here
Application
Hosts
always run
IP and up
Transport
Network
Data Link
Physical
Host
Router
Host
Needs each type of physical link
Loss of link  loss of path
(and possibly loss of useful work)
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DTN Stack
IP Internet
Non-IP Internet
Custody Transfer Storage:
helps to tolerate e2e disruption
Application
Bundle
Transport
Network
Data Link
Physical
Host
Conventional
Router
DTN Router
Intermittent Link Non-IP
Host
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Delay-Tolerant Networking RG: Bundle
Protocol now tested in space
Code uploaded to the UK-DMC Disaster Monitoring
Constellation satellite operated by Surrey Satellite Technology
Ltd (SSTL). SSTL, Cisco Systems and NASA Glenn tested this
by downloading a 150MB fragmented image of the Earth using
the Bundle Protocol (BP).
NASA JPL have also just done an experiment with DTN that
involved using the BP and the Licklider Transmission Protocol
(LTP) out to a distance of 15-25 million km! They'll be reporting
results on that at Thursday’s DTNRG session.
TIME Magazine call DTN one of the
best inventions of the year.
The image transfer testing was
cited in that article.
(#9 Orbital Internet,
10 November 2008 issue.)
Internet
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2 minute intro to the
Peer-to-Peer Research Group
P2PRG
Slides courtesy of:
Volker Hilt, Bell Labs
Stefano Previdi, Cisco
Peer-to-Peer Networks
• Symmetric relationship between hosts
– Either can be client or server (seem familiar?)
•
•
•
•
Distributed
Scales to large numbers of nodes & users
Autonomous
Support anonymity
• Old P2P systems: USENET, BGP
• New P2P systems: BitTorrent, Skype
• New uses
– Realtime video, OS update distro
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P2P Research Questions
• Consideration of network structure (beyond ALTO)
• Security, privacy, anonymity and trust.
• Improving interoperation between different P2P
systems
• Information storage, reliability, and retrieval in P2P
systems.
• Better understand P2P system performance and user
behavior “in the wild”
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Practical Example
•
•
•
Localization techniques for peer selection optimization (ALTO)
Different approaches on how to compute and provide localization information
are currently explored.
ALTO charter being focused on the protocol, P2PRG proposes a forum where
localization techniques can be discussed and documented
Source: Vinay Aggarwal, Anja Feldmann, Christian Scheideler.
Can ISPs and P2P systems co-operate for improved performance?
ACM SIGCOMM Computer Communications Review, Volume 37,
Number 3, July 2007.
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www.irtf.org
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