Update on the Internet Research Task Force
Aaron FalkIRTF Chair
IETF-73 – Minneapolis
IETF-73 -- Minneapolis 2
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)
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
IETF-73 -- Minneapolis 3
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 ResearchStephen Farrell, Trinity College DublinLloyd Wood, Cisco
Multi-path
USBUSB
Delay Tolerant Networking
NET( DSL )
DTNAgent
NET
NETwireless
SENDER APP
RECEIVER APP
Network
Store-carry-forward of messages
Multi-party comms modelFeatures
Extensible (URI-based) naming Supports multi-path routing and
caching with e2e disruptions6
DTNAgent
NETCACHE
DTNAgent
IETF-73 -- Minneapolis
Internet Stack
7
RouterHost Host
Application
Transport
Network
Data Link
Physical
No significant buffering here
Hosts always run IP and up
Needs each type of physical linkLoss of link loss of path (and possibly loss of useful work)
IETF-73 -- Minneapolis
DTN Stack
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DTN RouterHost Non-IPHost
Application
Transport
Network
Data Link
Bundle
Physical
Intermittent LinkConventionalRouter
Custody Transfer Storage: helps to tolerate e2e disruption
Non-IP InternetIP Internet
IETF-73 -- Minneapolis
Delay-Tolerant Networking RG: Bundle Protocol now tested in spaceCode 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
15-25 million km
700 km
IETF-73 -- Minneapolis 9
2 minute intro to the
Peer-to-Peer Research GroupP2PRG
Slides courtesy of:Volker Hilt, Bell LabsStefano 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
IETF-73 -- Minneapolis 11
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. 13IETF-73 -- Minneapolis
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www.irtf.org
IETF-73 -- Minneapolis
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