1. 1 Network Selection Problem Definition Draft-ietf-eap-netsel-problem-01.txt Jari Arkko Bernard Aboba

2. 2 Outline History and Status The basic problem Issues

3. 3 History and Status Draft -00 created based on EAP WG discussions that started with Farid’s draft Additional work during the last few months: –NAIbis in RADEXT WG –Farid’s 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

4. 4 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.

5. 5 The Basic Problem

6. 6 There’s 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

7. 7 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

8. 8 Yet another alternative decomposition Type of information discovered –Access network identity –Roaming agreements –QoS –Cost –Service parameters –...

9. 9 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

10. 10 Issues

11. 11 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.

12. 12 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@foo.com –Another possible NAI: arkko.com!jari@foo.com Proposal: Document this relationship

13. 13 Issue: Documenting Ongoing Work in Other SDOs Need to add a more up-to-date description of what IEEE work exists in this area Anything else?