Network Selection Problem Definition Draft-ietf-eap-netsel-problem-01.txt

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Network Selection Problem DefinitionDraft-ietf-ea
p-netsel-problem-01.txt

• Jari Arkko
• Bernard Aboba

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Outline

• History and Status
• The basic problem
• Issues

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History and Status

• Draft -00 created based on EAP WG discussions
  that started with Farids draft
• Additional work during the last few months
• NAIbis in RADEXT WG
• Farids EAP network discovery draft
• The Groeting draft and implementation results
• IEEE WIEN network selection work
• 3GPP network selection work
• Draft -01 updates the problem definition based on
  discussions and external events

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Recent Developments

• IEEE 802.11 WIEN study group formed.
• Liaison letter received from 802.11 Chair,
  requesting review of network discovery documents.
  
• Plan
• Request feedback on problem selection document
  from 802.11.
• Update problem statement document to incorporate
  feedback.
• EAP WG last call.

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The Basic Problem
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Theres actually multiple problems

• Access Network Discovery
• Which access point to attach to?
• Typically based on lower layer information.
• Identifier Selection
• Which identity and credentials to use for this
  AP?
• An NAI issue which affects EAP.
• Selection of roaming intermediaries
• How to route the AAA conversation to the home
  network?
• Payload Routing
• How to route payload traffic in the right way
• Filters and mandatory tunnels

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An alternative decomposition

• Discovery
• Access networks and access points
• Home networks available through these
• Mediating networks
• Decision
• Manual or automatic
• Automatic is preferred
• Most likely needs some pre-provisioned preference
  information
• Indicating the selected network
• Attach to the chosen network and access point
• Provide the chosen identity and home domain
• Possibly provide some hints about mediating
  networks

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Yet another alternative decomposition

• Type of information discovered
• Access network identity
• Roaming agreements
• QoS
• Cost
• Service parameters
• ...

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Some Earlier Findings...

• All the problems are relevant, and new solutions
  are needed
• The problems are very hard if you consider them
  with large number of networks, fast handoffs,
  security, and automatic decisions
• The proliferation of multiple network selection
  technologies within IEEE 802, IETF, and 3GPP
  would be bad
• Need to produce some early, simple solutions and
  wait for more full-blown schemes later

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Issues
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Issue Scope of Information

• A larger amount of information may be necessary
  for (ideal) network selection
• Service parameters, middlebox existence
• QoS, Cost
• EAP is an unlikely carrier for this information
• What about the verification of this information
  vs channel bindings?
• Proposal just discuss the problem without
  talking about where the information is carried.
  Point out possible connection with channel
  bindings to verify the information.

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Issue Relationship between mediating network and
identifier selection

• Observation both mediating networks and
  identifiers are represented in the same data item
  (NAI)
• Would an EAP network discovery advertisement work
  rather as a general identity hint than
  mediating-network-only hint?
• Hint foo.com
• Possible NAI to use jari_at_foo.com
• Another possible NAI arkko.com!jari_at_foo.com
• Proposal Document this relationship

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Issue Documenting Ongoing Work in Other SDOs

• Need to add a more up-to-date description of what
  IEEE 802.11 WIEN is working on
• Anything else?