Proxy Mobile IPv6 (PMIPv6)

Transcription

1 Proxy Mobile IPv6 (PMIPv6) Youn-Hee Han Korea University of Technology and Education Internet Computing Laboratory

2 Outline Background PMIPv6 (Proxy Mobile IPv6) Overview PMIPv6 Features IPv4 Support for PMIPv6 PMIPv6 and MIPv6 (Mobile IPv6) Interworking Summary 2/25

3 Background 3/25

4 Background Host-based Mobile IPv4/v6 (RFC 3344/3775) has not been yet deployed that much. Why host-based MIP is not deployed yet? Too heavy specification to be implemented at a small terminal RFC 3344 (MIPv4): 99 pages RFC 3775 (MIPv6): 165 pages Battery problem Waste of air resource No Stable MIPv4/v6 stack executed in Microsoft Windows CE OS 4/25

5 Background WLAN switch device starts to provide link specific and proprietary solution for IP handover. No change in MN protocol stack required! The solution works by tunneling traffic from the access point to the WLSM through your Layer 3 core network. No changes to the client devices or the underlying infrastructure are required 5/25

6 Background 3GPP, 3GPP2 and WiMAX operators are now showing their STRONG interests for network-based IP mobility solution They are even now deploying their non-standardized network-based IP mobility solution (not Mobile IPv4/v6!). IETF NetLMM WG started to standardize a network-based mobility management protocol. 63 th IETF (2005.7) The first NetLMM BoF 64 th IETF ( ) The second NetLMM BoF 65 th IETF ( ) The first NetLMM WG 66 th,67 th,68 th IETF ( , , ) The one of very active WGs in IETF meetings Almost 150~200 persons usually participates in the NetLMM WG Proxy Mobile IPv6 adopted as WG item 6/25

7 IETF NetLMM WG History NetLMM DT solution (draft-giaretta-netlmm-dt-protocol) : designed from the scratch Cisco s solution (draft-ietf-netlmm-proxymip6) : Proxy Mobile IPv6 (leverage MIPv6) Motorola s solution (draft-singh-netlmm-protocol) WG Chair (James Kempf, NTT) resigned after 67th meeting Vidya Narayanan (Qualcomm) WG Chair (Phil Roberts, Motorola) resigned after 68th meeting Jonne Soininen (Nokia) 7/25

8 Internet Drafts of PMIPv6 IETF PMIPv6 Drafts History Individual S. Gundavelli (CISCO), K. Leung (CISCO), and V. Devarapalli (Azaire Networks), Proxy Mobile IPv6, draft-sgundave-mipv6-proxymipv6-00, October 16, S. Gundavelli (CISCO), K. Leung (CISCO), and V. Devarapalli (Azaire Networks), K. Chowdhury (Starent Networks), Proxy Mobile IPv6, draftsgundave-mipv6-proxymipv6-01, January 5, S. Gundavelli (CISCO), K. Leung (CISCO), and V. Devarapalli (Azaire Networks), K. Chowdhury (Starent Networks), B. Patil (Nokia), Proxy Mobile IPv6, draft-sgundave-mipv6-proxymipv6-02, March 5, Official WG Item S. Gundavelli (CISCO), K. Leung (CISCO), and V. Devarapalli (Azaire Networks), K. Chowdhury (Starent Networks), B. Patil (Nokia), Proxy Mobile IPv6, draft-ietf-netlmm-proxymip6-00.txt, April 8, /25

9 Goal Goal of PMIPv6 This protocol is for providing mobility support to any IPv6 host within a restricted and topologically localized portion of the network and without requiring the host to participate in any mobility related signaling. registration PMIPv6 Scenario (being extended) 9/25

10 PMIPv6 Overview IP Tunnel A IPinIP tunnel LMA and MAG. LMA: Localized Mobility Agent MAG: Mobile Access Gateway MN s Home Network Prefix (MN-HNP) CAFE:1:/64 MAG1 LMA Home Network MN s Home Network (Topological Anchor Point) Host A MAG2 LMM (Localized Mobility Management) Domain LMA Address (LMAA) That will be the tunnel entrypoint. MN s Home Network Prefix (MN-HNP) CAFE:2:/64 Host B MN Home Address (MN-HoA) MN continues to use it as long as it roams within a same domain Proxy Care of Address (Proxy-CoA) The address of MAG. That will be the tunnel end-point. Proxy Binding Update (PBU) Control message sent out by MAG to LMA to register its correct location 10/25

11 New entities LMA (Local Mobility Anchor) Home Agent for the mobile node in the PMIPv6 domain PMIPv6 Overview Assigns MN's home prefix and manages the MN's reachability state MAG (Mobile Access Gateway) Manages the mobility related signaling for a mobile node Tracking the mobile node's attachment to the link and for signaling the MN's LMA Assumptions (or Restrictions) Link between MN and MAG is a point-to-point link (not shared link) Logically exclusive layer 3 link between MN and MAG Per-MN Prefix model unique home network prefix is assigned to MN Support both Steteless and Stateful address configuration modes 11/25

12 PMIPv6 Operation Flow PBU: Proxy Binding Update PBA: Proxy Binding Ack. MN MAG AAA&Policy Store LMA CN MN Attachment RA* AAA Query with MN-ID AAA Reply with Profile PBU with MN-ID, Home Network Prefix option, Timestamp option RA** PBA with MN-ID, Home Network Prefix option Optional Tunnel Setup DHCP Request DHCP Response [MN-HoA:CN](data) DHCP Server DHCP Request DHCP Response [Proxy-CoA:LMAA][MN-HoA:CN](data) [MN-HoA:CN](data) 12/25 RA*: MN 의 Prefix 를 Policy Store 에서수신한경우의 Router Advertisement RA**: MN 의 Prefix 를 LMA 에서수신한경우의 Router Advertisement

13 PMIPv6 Features Home in Any Place Network Entry (or Handover) Procedures After MN attachment, MAG gets MN s profile MN-Identity LMA address and other configuration parameters Obtain MN s home network prefix information Static Scheme Get it from Profile Dynamic Scheme Get it from LMA via PBU/PBA Now MAG have enough information to emulate MN s home link Send the RA (Router Advertisement) messages advertising MN s home network prefix and other parameters MN will always obtain its home network prefix, any where in the network. MAG runs on the access router will emulate the home link on its access link. It will ensure that MN believes it is at its home. 13/25

14 Proxy Registration LMA needs to understand the Proxy Registration RFC 3775 MIPv6 BU/Back Reuse PMIPv6 Features PBU (Proxy Binding Update) PBA (Proxy Binding Acknowledgement) 14/25

15 M:1 Tunnel LMA-MAG tunnel is a shared tunnel among many MNs. 1:1 relation m:1 relation PMIPv6 Features One tunnel is associated to multiple MNs Binding Caches. Life-time of a tunnel should not be dependent on the life time of any single BCE. LMA s Prefix-based Routing LMA will add prefix routes to MN s home network prefix over the tunnel. Routing State for a MN stored in LMA 15/25

16 MAG establishes IPv6 in IPv6 tunnel with LMA PMIPv6 Features Routing State for a MN stored in MAG RA (Router Advertisement) should be UNICASTed to an MN It will contain MN s Home Network Prefix 16/25

17 Any MN is just a IPv6 host PMIPv6 Features Any MN is just a IPv6 host with its protocol operation consistent with the base IPv6 specification. All aspects of Neighbor Discovery Protocol will not change. IPv6 protocol parameter consideration Lower default-router list cache timeout LLA: Link Local Address (e.g., MAC Address) 17/25

18 IPv4 Support for PMIPv6 Two functions supported IPv4 Transport Network Support IPv6 in IPv4 tunnel, IPv4 in IPv4 tunnel, NAT Traversal IPv4 Home Address Mobility An IPv4-only or dual-stack MN will be able to obtain an IPv4 address (IPv4- MN-HoA) and will be able to roam in that PMIPv6 domain using that address. The signaling protocol is based on Proxy Mobile IP6. 18/25

19 Leveraging the existing Dual Stack Mobile IPv6 (DSMIPv6) protocol Hesham Soliman (Ed.), Mobile IPv6 support for dual stack Hosts and Routers (DSMIPv6), draft-ietf-mip6-nemo-v4traversal-04.txt, March, 2007 CN IPv4 Support for PMIPv6 CN IPv4 Packet v4 Network IPv6 Packet v6 Network v4 Network The new WG draft for IPv4 support for PMIPv6 R. Wakikawa (Keio Univ.), S. Gundavelli (Cisco), IPv4 Support for Proxy Mobile IPv6, draft-ietf-netlmm-pmip6-ipv4-support-00.txt, May 2007 HA NAT Tunneled to private IPv4 CoA Tunneled to IPv6 CoA Private v4 Network v6 Network Tunneled to IPv4 CoA Movement Movement 19/25

20 IPv4 Support for PMIPv6 PMIPv6 s IPv4 Support Dual Stack MN or IPv4 MN PBU (V6 Addr., Proxy CoA v6, V4 Addr.) IPv6 Tunnel (LMAAv6->Proxy CoAv6) [Mobility Binding] V4 Addr. and V6 Addr. Proxy CoAv6 IPv4 traffic CNv4 V4 Addr. Dual Stack MAG <MN in IPv6 domain> Dual Stack LMA IPv6 traffic CNv6->V6 Addr. [Mobility Binding] Dual Stack MN or IPv4 MN PBU (V6 Addr., Proxy CoA v6, V4 Addr.) V4 Addr. and V6 Addr. Proxy CoAv4 IPv4 traffic CNv4 V4 Addr. IPv4 Tunnel (LMAAv4->Proxy CoAv4) Dual Stack MAG <MN in IPv4 domain> Dual Stack LMA IPv6 traffic CNv6->V6 Addr. 20/25

21 PMIPv6 and MIPv6 Interworking V. Devarapalli (Azaire Network), S. Gundavelli (Cisco), K. Chowdhury (Starent Networks), A. Muhanna (Nortel), Proxy Mobile IPv6 and Mobile IPv6 Interworking, draft-devarapalli-netlmm-pmipv6-mipv6-00.txt, April PMIPv6 is typically used for localized mobility management and MIPv6 is applied for global mobility management. In case of intra-domain movement the MN and MIPv6 HA are not aware of the movement. In case of inter-domain movement It acquires a new MN-HoA in the new domain It treats the new MN-HoA as the CoA of MIPv6. It treats the previous MN-HoA as the HoA of MIPv6. MN sends MIPv6 binding update with the pair (New MN-HoA, Prev. MN-HoA). 21/25

22 PMIPv6 and MIPv6 Interworking Case #1. MN in a Home Domain PMIPv6 Domain #2 PMIPv6 Domain #3 HoA Binding Cache CoA MIPv6-Home Agent = LMA #1 Proxy Flag MAG #1-1 MAG #1-2 MN-HoA #1 MAG#1-1 s Addr. 1 Proxy BU PMIPv6 Domain #1 (Mobile IPv6 Home Domain) 22/25 In the interior of MN, MIPv6-CoA is not needed since all MAGs will emulate the home link. MIPv6-HoA = MN-HoA #1

23 PMIPv6 and MIPv6 Interworking Case #2. Movement in a Home Domain PMIPv6 Domain #2 Non-PMIPv6 Domain HoA Binding Cache CoA MIPv6-Home Agent = LMA #1 Proxy Flag MAG #1-1 MAG #1-2 MN-HoA #1 MAG#1-2 s Addr. 1 PMIPv6 Domain #1 (Mobile IPv6 Home Domain) 23/25 Proxy BU In the interior of MN, MIPv6-CoA is still not needed since all MAGs will emulate the home link. PMIPv6 is operated! Still MIPv6-HoA = MN-HoA #1

24 PMIPv6 and MIPv6 Interworking Case #3. MN moves to a new domain MAG #2-1 Binding Cache Proxy BU MIPv6 BU MAG #2-2 LMA #2 HoA CoA Proxy Flag MN-HoA #2 MAG#2-1 s Addr. 1 PMIPv6 Domain #2 Non-PMIPv6 Domain Binding Cache MIPv6-Home Agent = LMA #1 HoA PMIPv6 Domain #1 (Mobile IPv6 Home Domain) 24/25 CoA Proxy Flag MN-HoA #1 MN-HoA #2 0 Both MIPv6 and PMIPv6 are operated! MN obtains MN-HoA #2 MN maintains two addresses - MIPv6-HoA = MN-HoA #1 - MIPv6-CoA = MN-HoA #2

25 PMIPv6 can be a way to facilitate the deployment of IP mobility Reuse deployed infrastructure & Mobile IPv6 functionality Favorable to ISPs PMIPv6 is New Idea? Absolutely No!, but new trend!. It s a turn for the better! PMIP is a good example of compromise Until now, long confrontation Telecommunication Operators Internet Developers and Users It is still RFC 3775 MIP-based one. But, it follows telco s favoritism! More Studies Needed Route Optimization in PMIPv6 Fast Handover in PMIPv6 PMIPv6 over IEEE /WiBro (Cross-layering Issues) New Research Areas using PMIPv6 Network-based Global Mobility PMIPv6-based NeMo (MANEMO) PMIPv6-based 6LowPAN Sensor Node Mobility Summary 25/25