Update on the Internet Research Task Force

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Update on the Internet Research Task Force

• Aaron Falk
• IRTF Chair
• IETF-73 Minneapolis

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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
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2 minute intro to theDelay-Tolerant Networking
Research GroupDTNRG

• Slides courtesy of
• Kevin Fall, Intel Research
• Stephen Farrell, Trinity College Dublin
• Lloyd Wood, Cisco

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Delay Tolerant Networking
RECEIVER APP
SENDER APP
DTNAgent
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
Non-IP Internet
IP Internet
Custody Transfer Storage helps to tolerate e2e
disruption
Application
Bundle
Transport
Network
Data Link
Physical
Intermittent Link
Conventional Router
Host
DTN Router
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 Thursdays DTNRG
session.
15-25 million km
700 km
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 thePeer-to-Peer Research
GroupP2PRG

• Slides courtesy of
• Volker Hilt, Bell Labs
• Stefano Previdi, Cisco

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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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