1. IETF Network Discovery and Selection Overview
September 2004
IETF Network Discovery and Selection Overview
Eleanor Hepworth, Andrew McDonald
Siemens Roke Manor
E. Hepworth/A. McDonald, Siemens Roke Manor

2. IETF Network Discovery and Selection Overview
September 2004
IETF Network Discovery and Selection Overview
We have been requested to review two Internet Drafts
Network Discovery and Selection Problem (draft-ietf-eap-netsel-problem-01.txt)
Identity selection hints for EAP (draft-adrangi-eap-network-discovery-03.txt)
E. Hepworth/A. McDonald, Siemens Roke Manor

3. Network Discovery and Selection Problem Internet Draft
September 2004
Network Discovery and Selection Problem Internet Draft
Provides a problem definition
Specifies design constraints
Identifies existing work
E. Hepworth/A. McDonald, Siemens Roke Manor

4. Problem Definition Three different ways to view the problem:
September 2004
Problem Definition
Three different ways to view the problem:
Access network discovery, Identity selection, AAA routing, Payload routing
Discovery, Decision, and Selection
Type of Information
access network identification, roaming agreements, authentication mechanisms, QoS, cost, etc
E. Hepworth/A. McDonald, Siemens Roke Manor

5. Design Constraints Constraints relating to AAA routing and protocols
September 2004
Design Constraints
Constraints relating to AAA routing and protocols
Must be Compatible with future AAA or access network features
Must not consume significant resources
Must not cause problems with limited packet sizes
Should not require changes to installed base of APs, clients, network access servers
Should allow interoperability with devices not modified to support network discovery and selection
E. Hepworth/A. McDonald, Siemens Roke Manor

6. Existing Work Provides overview of work from IETF IEEE 3GPP
September 2004
Existing Work
Provides overview of work from
IETF
IEEE
3GPP
Others (WWRF, Intel)
E. Hepworth/A. McDonald, Siemens Roke Manor

7. Conclusions A solution is needed
September 2004
Conclusions
A solution is needed
Alternative views/solutions coming from IETF/IEEE/3GPP
New link layers should have support for providing network advertisement information
May not be possible to solve all problems with current link layers – may need phased approach
E. Hepworth/A. McDonald, Siemens Roke Manor

8. Identity selection hints for EAP Internet Draft
September 2004
Identity selection hints for EAP Internet Draft
Provides a solution to part of the problem described in the netsel-problem draft
Allows a network to advertise the NAI realms it supports in an EAP Identity Request
E. Hepworth/A. McDonald, Siemens Roke Manor

9. September 2004
Background
Developed from previous draft (draft-adrangi-eap-network-discovery-and-selection-01.txt) which covered both discovery and selection
Network selection (NAI decoration) moved to draft RFC2486bis
This draft covers only the discovery aspect
Tried to present the concept in much shorter text and a more generic way so that it can be applied for mediating network discovery (required by 3gpp) and identity selection
Adapted from an from Farid Adrangi
E. Hepworth/A. McDonald, Siemens Roke Manor

10. September 2004
Proposed Solution
Add identity hint information after displayable string in EAP Identity Request
Example:
identity-request-data = [ displayable-string ]
[ %x00 "NAIRealms=" realm-list ]
displayable-string = *OCTET
realm-list = realm /
( realm-list ";" realm )
"Hello\0NAIRealms=example.com;mnc014.mcc310.3gppnetwork.org"
E. Hepworth/A. McDonald, Siemens Roke Manor

11. Alternative Candidate Solutions
September 2004
Alternative Candidate Solutions
The previous discovery-and-selection draft selected this option from a number of candidates
Network information included in SSID
AP broadcasts (e.g. beacon frames)
Probe request/response
Client-side mapping of SSID to mediating network names
EAP
E. Hepworth/A. McDonald, Siemens Roke Manor