1. Improving the eduroam experience with Interworking (802.11u)
Scott Armitage
#tnc2013

2. Introduction What is IEEE 802.11u / HS20 /Passpoint?
How can eduroam benefit from u?
Interworking in action

3. IEEE 802.11-2012 Interworking (11u)
Previously known as u
Provides pre-association information to client
Two-way communication
Uses Access Network Query Protocol (ANQP)
Use Generic Advertisement Service (GAS)
2 Way
Provides Layer 2 transport for ANQP

4. IEEE 802.11-2012 Interworking Cont.
Provides standardised information to client
Access Network Type (Private, Guest Access, etc.)
Internet Available
Captive portal (ASRA)
Emergency Services Reachable (ESR) and (UESA)
Venue Information (Group and Type) e.g. Education / University
Venue Name (eng:Loughborough University Library)
HESSID

5. IEEE 802.11-2012 Interworking cont.
Roaming Consortium ID
Identifies a roaming network e.g. eduroam
TERENA OUI – 001bc50460
Domain Name
Identifies WLAN operators home domain(s)
e.g. lboro.ac.uk
NAI Realm
List of realms which can use the WLAN
Vendor Specific Attributes
e.g. 50-6f-9a (WiFi Alliance Hotspot 2.0)

6. Hotspot 2.0 / Passpoint
Hotspot 2.0 Specification published by Wi-Fi Alliance
Hotspot 2.0 Task Group
Passpoint Device certification program
Devices which implement HS20 can be Passpoint certified

7. Use Case for eduroam Clients prefer home eduroam service over roaming
Useful in crowded cities like London
Providing users with information about the eduroam Service Provider
Including support information for reporting problems
Better load balancing between Service Providers
HS20 Connection metrics
Easier client configuration

8. Testing TERENA OUI - 001bc50460 Cisco Unified Wireless Hostapd
Ubuntu / wpa_supplicant
Samsung Galaxy S3
Samsung Galaxy S4

9. Cisco u Configuration

10. Cisco Hotspot 2.0 Configuration

11. Samsung Galaxy S3 / S4 Galaxy S3 Passpoint menu options enabled
*# # (*#hotspot20#)
cred.conf in the root storage
Galaxy S4
Passpoint menus available ‘out of the box’

12. Samsung S3 / S4 cred.conf

13. Samsung Galaxy S3 / S4

14. Samsung S4 Scan

15. Samsung S4 Home / Roaming

16. Samsung S4 Debug

17. Samsung S4 Debug

18. Problems Requirement for (NAI) Realm Attribute
Lack of GAS/ANQP server implementation to lookup eduroam realms
Client implementations may not support lookup
Lack of support in Client devices and APs
Standard being driven by commercial hotspot operators and mobile phone carriers.
Different priorities to eduroam

19. Questions?
@armitasp