Transcript PMIPv6 Features - LINK@KoreaTech

Proxy MIPv6 구현기술 및 전망
Youn-Hee Han
[email protected]
Korea University of Technology and Education
Internet Computing Laboratory
http://icl.kut.ac.kr
Outline
 Background
 PMIPv6 (Proxy Mobile IPv6) Overview
 PMIPv6 Features
 69th IETF NetLMM WG Report
 PMIPv6 Handover Latency
 Implementation Report
 Conclusions & Discussion
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Background - IP Mobility
What is IP Mobility?
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Handles changes to the IP point of presence
Provides transparent session continuity to upper layers (TCP, UDP,
Applications)
Forwards packets destined for an “original (home)” IP address to a
“transient (care-of)” IP address
Preserve IP Session continuity
출처: 유비유넷
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Background - IP Mobility
Network-based Mobility
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Mobility handled by the network, often transparent to the mobile node
Directly or indirectly triggered by the mobile node
Host-based Mobility
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Mobility handled by the mobile node
Full involvement of the mobile node
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Background – Why Network-based?
Host-based Mobile IPv4/v6 (RFC 3344/3775) has not been yet
deployed that much.
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Why host-based MIP is not deployed yet?
 Too heavy specification to be implemented at a small terminal
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RFC 3344 (MIPv4): 99 pages
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RFC 3775 (MIPv6): 165 pages
 Battery problem
 Waste of air resource
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No Stable MIPv4/v6 stack executed in Microsoft Windows OS
3GPP, 3GPP2 and WiMAX operators are now showing their STRONG
interests for network-based IP mobility solution
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They are even now deploying their non-standardized network-based IP
mobility solution (not Mobile IPv4/v6!).
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IETF NetLMM WG
IETF NetLMM WG started to standardize a network-based mobility
management protocol.
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63th IETF (2005.7)
 The first NetLMM BoF
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64th IETF (2005.11)
 The second NetLMM BoF
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65th IETF (2006.03)
 The first NetLMM WG
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66th,67th,68th IETF (2006.07, 2006.11, 2007.03)
 The one of very active WGs in IETF meetings
 Almost 150~200 persons usually participates in the NetLMM WG
 Proxy Mobile IPv6 (PMIPv6) adopted as WG item
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69th IETF (2007.07)
 PMIPv6-01 introduced
 Other issues brought up
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Route optimization, Fast Handover, MIPv6 interaction, Multi-homing, etc.
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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)
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Internet Drafts of PMIPv6
IETF PMIPv6 Drafts History
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Individual
 S. Gundavelli (CISCO), K. Leung (CISCO), and V. Devarapalli (Azaire Networks), “Proxy
Mobile IPv6,” draft-sgundave-mipv6-proxymipv6-00, October 16, 2006.
 S. Gundavelli (CISCO), K. Leung (CISCO), and V. Devarapalli (Azaire Networks), K.
Chowdhury (Starent Networks), “Proxy Mobile IPv6,” draft-sgundave-mipv6-proxymipv601, January 5, 2007.
 S. Gundavelli (CISCO), K. Leung (CISCO), and V. Devarapalli (Azaire Networks), K.
Chowdhury (Starent Networks), B. Patil (Nokia), “Proxy Mobile IPv6,” draft-sgundavemipv6-proxymipv6-02, March 5, 2007.
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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, 2007.
 S. Gundavelli (CISCO), K. Leung (CISCO), and V. Devarapalli (Azaire
Networks), K. Chowdhury (Starent Networks), B. Patil (Nokia), “Proxy Mobile
IPv6,” draft-ietf-netlmm-proxymip6-01.txt, June 18, 2007.
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Goal of PMIPv6
Goal
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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
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PMIPv6 Scenario
(being extended)
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PMIPv6 Overview
LMA: Localized Mobility Agent
MAG: Mobile Access Gateway
IP Tunnel
IP-in-IP tunnel between LMA and MAG
LMA
Home Network
MN’s Home Network
(Topological Anchor Point)
MAG
LMA Address (LMAA)
movement
MN’s Home Network Prefix (MN-HNP)
CAFE:2:/64
MN’ Home Address (MN-HoA)
MN continues to use it as long as
it roams within a same domain
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MAG
That will be the tunnel entry-point
LMM
(Localized Mobility Management)
Domain
Proxy Binding Update (PBU)
Control message sent by MAG to LMA
to establish a binding between MN-HoA
and Proxy-CoA
Proxy Care of Address (Proxy-CoA)
The address of MAG
That will be the tunnel end-point
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PMIPv6 Overview
New entities
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LMA (Local Mobility Anchor)
 Home Agent for the mobile node in the PMIPv6 domain
 Assigns MN's home prefix and manages the MN's reachability state
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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)
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Link between MN and MAG is a point-to-point link (not shared link)
 Logically exclusive layer 3 link between MN and MAG
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Per-MN Prefix model
 unique home network prefix is assigned to MN
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Support both Steteless and Stateful address configuration modes
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PMIPv6 Operation Flow
PBU: Proxy Binding Update
PBA: Proxy Binding Ack.
MN
MAG
MN Attachment
RA*
AAA&Policy Store
LMA
CN
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
Tunnel Setup
Optional
DHCP Request
DHCP Server
DHCP Request
DHCP Response
DHCP Response
[Proxy-CoA:LMAA][MN-HoA:CN](data)
[MN-HoA:CN](data)
[MN-HoA:CN](data)
RA*: MN의 Prefix를 Policy Store에서 수신한 경우의 Router Advertisement
RA**: MN의 Prefix를 LMA에서 수신한 경우의 Router Advertisement
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PMIPv6 Features
Home in Any Place
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MAG sends the RA (Router Advertisement) messages advertising MN’s home
network prefix and other parameters
MAG will emulate the home link on its access link.
 MN always obtain its “home network prefix”, any where in the network.
 It will ensure that MN believes it is at its home.
M:1 Tunnel
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LMA-MAG tunnel is a shared tunnel among many MNs.
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One tunnel is associated to multiple MNs’ Binding Caches.
RA Unicast
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RA should be UNICASTed to an MN
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It will contain MN’s Home Network Prefix
 Per-MN Prefix
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PMIPv6 Features
Proxy Registration
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LMA needs to understand the Proxy Registration
RFC 3775 MIPv6 BU/BAck Reuse
PBU (Proxy Binding Update)
PBA (Proxy Binding Acknowledgement)
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PMIPv6 Features
LMA’s Prefix-based Routing
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LMA will add prefix routes to MN’s home network prefix over the tunnel.
Routing State for a MN
stored in LMA
MAG establishes IPv6 in IPv6 tunnel with LMA
Routing State for a MN
stored in MAG
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PMIPv6 Features
Any MN is just a IPv6 host
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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)
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69th IETF NetLMM WG Report
Base protocol and IPv4 support reasonably stable
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More reviews and updates needed before the documents can be sent
to last call
PMIP6-MIP6 interactions work in progress
Next steps to be discussed after current work progress to last call
IETF NetLMM WG Milestones
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Done Initial version of the Protocol draft submitted
Done Initial version of the IPv4 support document
Aug 07 Initial version of the PMIP6-MIP6 interactions document
Aug 07 WG LC on MN-AR document
Aug 07 WG LC on the Protocol document
Sep 07 WG LC on the IPv4 support document
Oct 07 WG LC on the PMIP6-MIP6 Interactions document
Oct 07 Submit Protocol, IPv4 support and MN-AR documents for AD
review
Nov 07 Submit PMIP6-MIP6 Interactions document for AD review
Dec 07 Re-charter
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PMIPv6 Handover Latency Comparison
Reference Models and Parameters
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PMIPv6 Handover Latency Comparison
Mobile IPv6
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PMIPv6 Handover Latency Comparison
Hierarchical Mobile IPv6 (Intra-domain)
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PMIPv6 Handover Latency Comparison
Proxy Mobile IPv6
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PMIPv6 Handover Latency Comparison
Comparison Results
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MIPv6
HMIPv6
PMIPv6
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Implementation Report
System Block Diagram
HostAP
daemon
(WLAN AP
functionality)
PMIPv6 MAG
daemon
(MIPv6-MN)
Netlink
RtNetlink
PMIPv6 LMA
daemon
(MIPv6-HA)
App.
<User>
<Kernel>
<Kernel>
control
Link-Up
Event
App.
<User>
IPv6 Networking
(MIPv6 patched)
WLAN Driver
IEEE 802.11
MAC Control
LMA
MAG
data
Link-Up Event
Processing
Address
Configuration
Netlink
RtNetlink
IPv6 Networking
(MIPv6 patched)
control
LAN Driver
PBU/PBAck
IPv6 ND
Message
Exchange
data
Data
Packets
IP Routing
Processing
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Implementation Report
System Block Diagram
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HostAP daemon
 WLAN driver와 연동하여 AP의 본 기능과 WPA 인증 기능 수행
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PMIP MAG/LMA daemon
 MIPv6 daemon을 수정하여 PMIP 기능 수행
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NetLink/RtNetLink
 라우팅 테이블, 터널링, IP 주소 관리, Link Up/Down 관련 기능 수행
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IPv6 Networking
 IPv6 networking kernel part, MIPv6를 위한 patch가 적용됨
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Implementation Report
Testbed Setup
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MAG (MAG1, MAG2)
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CPU: Intel Pentium 4, 3.00GHz
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802.11 NIC: Linksys Dual-Band Wireless A+G
PCI Adapter WMP-55AG (Atheros Chipset)
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OS: Debian 3.1 sarge, kernel 2.6.10
LMA
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CPU: Intel Pentium 4, 1.80GHz
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OS: Debian 3.1 sarge,
kernel 2.6.10
CN
CN, MN
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CPU: Intel Pentium 4,
1.80GHz, 1.6 GHz
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OS: Windows XP, SP2
eth0) 192.168.2.1
3ffe:2::1/64
CN: VLC media server
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MN: VLC media player
eth2) 163.152.45.236
eth0) 192.168.1.3
3ffe:1::3/64
VoD Streaming Software
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eth0) 192.168.2.3
3ffe:2::3/64
MAG1
eth0) 192.168.1.1
3ffe:1::1/64
eth0) 192.168.1.2
3ffe:1::2/64
HUB
MAG2
Prefix Pool to be allocated
to MN by LMA
Test Results
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ra0) 192.168.101.1
3ffe:1:1::1/64
3ffe:1:3:1::/64
~
3ffe:1:3:ffff::/64
ra0) 192.168.102.1
3ffe:1:2::1/64
http://icl.kut.ac.kr/lab/pmip6_test.wmv
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PMIPv6 over WiBro
IPv6 Link Model in WiBro
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IP Link
 An ACR
 Multiple RASs attached to the ACR
IP Link 1
PSS 1
RAS 1
 Multiple PSSs attached to these RASs
PSS 2
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ACR is the first hop access router of a
PSS.
ACR/MAG 1
PSS 3
RAS 2
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Even from IP perspective, an PSS
cannot communicate with another PSS
directly. All traffic go through an AR.
 It implies that an PSS's on-link neighbor
is only an AR.
 Peer-to-peer Model
PSS 4
PSS 5
RAS 3
PSS 6
ACR/MAG 2
IP Link 2
Ref.] S. Madanapalli, “Analysis of IPv6 Link Models for IEEE 802.16 Based Networks,” RFC4968, Aug. 2007
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PMIPv6 over WiBro
Prefix Model Selection
Current
Should be changed to…
Shared Prefix Model
Unique Prefix Model
PSS 1
PSS 1
L3
IPv6 (Shared Prefix Model)
L2
RAS
L3
GRE Tunnel
PSS 2
GRE Tunnel
L2
RAS
L3
IPv6 (Shared Prefix Model)
RAS
L2
ACR/
MAG
Wireless Peer-to-Peer Connection
IPv6 (Unique Prefix Model)
GRE Tunnel
ACR/
MAG
Wireless Peer-to-Peer Connection
PSS 2
L2
L3
RAS
GRE Tunnel
IPv6 (Unique Prefix Model)
Ref.] S. Madanapalli, “Analysis of IPv6 Link Models for IEEE 802.16 Based Networks,” RFC4968, Aug. 2007
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Conclusions & Discussion
PMIPv6 can be a way to facilitate the deployment of IP mobility
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Favorable to ISPs
PMIPv6 is New Idea?
 Absolutely No!, but new trend!. It’s a turn for the better!
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In the handover latency aspect, PMIPv6 is very good protocol!
More Study and Standardization Needed
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Route Optimization in PMIPv6
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Fast Handover in PMIPv6
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Multihoming
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Cross-layering Issues
 PMIPv6 over IEEE 802.16/WiBro
 Fast Handover with leverage of IEEE 802.21
New Research Areas
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Network-based Global Mobility
PMIPv6-based NeMo (MANEMO)
PMIPv6-based 6LowPAN Sensor Node Mobility
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