Delay Tolerant Network Endpoint ID Discussion

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Delay Tolerant NetworkEndpoint ID Discussion

• David Young - Ohio University IRG
  david.a.young_at_gmail.com
• Joerg Ott - TKK Netlab
• jo_at_netlab.tkk.fi

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Current EID Conventions

• Bundle Protocol Specification
• ltschemegt ltscheme-specific partgt
• both fields limited to 1023 bytes
• dtnnone  -- null endpoint
• DTN2
• dtn lthostnamegt.dtn / ltappnamegt .ltidgt
• ltidgt used is the OS PID (see dtnping)
• multihoming unsupported
• ION
• ipn ltelement_numbergt ltservice_numbergt
• ltservice_numbergt 0 reserved for admin bundles
• multihoming unsupported

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Current Routing Conventions

• DTN2
• Route aggregation via wildcard
• ltprefixgt
• route add dtn//mybox.dtn/ link_tcp
• dtn//mybox.dtn/dtnping  ?match
• dtn//mybox.dtn/dtnsend.43233 ?match
• ION
• Implicit aggregation of service_number
• Only element_number considered.
• a plan 2 router x tcp/amroc.jpl.nasa.gov5001
• ipn2.0 ?match
• ipn2.10 ?match

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EID issues

• Multiple Implementations
• ion, dtn2 ...
• Different schemes
• Naming Collisions
• dtn//linksys.dtn
• Crossing Dumb(er) Nodes
• Intermediate nodes don't understand your scheme
• Application Context
• How much application context goes in the EID?
• Where else could it go?

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Some Solutions

• New schemes for every application
• mailto ftp ...
• Allows routing/load balancing by application
• Demux at bundle layer, not application
• Explicit nature avoids indirection/lookups
• Application-hints extension block

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Some (more) Suggestions

• Disclaimer
• Modify dtn// for more general use
• Use FQDNs if dns is possible
• Reduces likelihood of collision
• Makes routing easier on terrestrial internet
• Continue notation, but reverse order of FQDN
• dtn//edu.ohiou.cs.myhost
• allows more aggregation, especially at gateway
• New scheme for general use.
• Lowest common denominator of EID on all platforms
• No application data/optional application data
• Multiple schemes in same EID for interoperability
• dtn//dtnnetwork.ohiou.edu.dtn/ipn1.0
• Networks that do not understand each other's
  schemes

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References

• Application Conventions for Bundle-based
  Communications
• draft-ott-dtnrg-appl-00
• Architectural Considerations for the use of
  Endpoint Identifiers in Delay Tolerant Networking
• draft-eddy-dtnrg-eid-00
• Bundle Protocol Specification
• rfc5050