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Enabling Binding Update via access authorization

Enabling Binding Update via access authorization. Charles Perkins, Basavaraj Patil IETF 82 [ netext ] WG / Taipei November 16, 2011. The problem. Mobile devices often have to carry out two separate authentications before receiving packets at from home network

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Enabling Binding Update via access authorization

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  1. Enabling Binding Update via access authorization Charles Perkins, BasavarajPatil IETF 82 [netext] WG / Taipei November 16, 2011

  2. The problem Mobile devices often have to carry out two separate authentications before receiving packets at from home network • Access authorization at local access network • Binding Update to home network This typically makes smooth handovers impossible.

  3. A solution • Enable access authorization to be relayed by the Home Agent which can then perform the Binding Update • For access authorizations using EAP, this can be done very simply by defining a new format for authentication data that is the same as the required EAP authentication data

  4. EAP Authentication Data [EAPAD] • The EAP Authentication Data [EAPAD] subtype has exactly the format defined in RFC 3748 for an EAP message. • This enables the LMA to unwrap the EAP message for delivery to AAA, acting as a simple AAA relay • LMA uses the EAP reply status to determine whether to apply the Binding Update

  5. Binding Acknowledgement Authentication Data • LMA needs to complete the authentication sequence by returning PBAck to the MAG. • The PBAck Authentication Data option uses, similarly to the PBU previously described, data as defined by RFC 3748 • When MAG receives the data, then it can complete the EAP sequence, say according to 802.1x

  6. Combined Auth/Reg in PMIP6 MN LMA AP AR/MAG AAA 802.11 Assoc (Access blocked) EAPOL-Start LMA acts as a AAA proxy/relay EAP-Req/Identity PBU with EAPAD RADIUS Access Req EAP-Method PBA with EAPAD Binding created EAP Success RA or DHCP

  7. Combined Auth/Reg in MIP6 MN HA AP AR AAA 802.11 Assoc (Access blocked) EAPOL-Start HA acts as a AAA proxy/relay (Extract/Process BU) EAP-Req/Identity Include BU inside the EAP message RADIUS Access Req EAP-Method Binding created EAP Success Assumption: MN obtains CoA from AR prior to start of EAP

  8. Role of NAI • The MN should naturally be identified by its NAI, and MN-NAI extension applied to PBU / PBAck. The NAI should identify which home agent / LMA is appropriate for the home address of the mobile node. • If there are thousands of home agent for the same AAA, then a local AAA relay can be configured with this information instead of configuring each MAG separately.

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