26-07-2012, 11:56 AM
Introduction to IPv6
Introduction to IPv6.pptx (Size: 1.45 MB / Downloads: 31)
Introduction
Mobile IPv6 is intended to enable IPv6 nodes to move from one IP subnet to another
While a mobile node is away from home
It sends information about its current location to a home agent
The home agent intercepts packets addressed to the mobile node and tunnels them to the mobile node’s present location
Relevant Features of IPv6
Larger Address Space
Aggregation-based address hierarchy
– Efficient backbone routing
Efficient and Extensible IP datagram
Stateless Address Autoconfiguration
Security (IPsec mandatory)
Mobility
Mobile IPv6 Operation
Home Agent Registration
An MN performs address autoconfiguration (stateful or stateless) to get its care-of address
The MN registers its care-of address with its home agent on the home link
Use “Binding Update” Destination Option
The HA uses proxy Neighbor Discovery and also replies to Neighbor Solicitations on behalf of the MN
Movement Detection
While away from home, an MN selects one router and one subnet prefix advertised by that router to use as the subnet prefix in its primary care-of address
To wait for the periodically sent Router Advertisements
IP Micro-mobility support
Micro-mobility support:
Efficient local handover inside a foreign domainwithout involving a home agent
Reduces control traffic on backbone
Especially needed in case of route optimization
Example approaches:
Cellular IP
HAWAII
Hierarchical Mobile IP (HMIP)
Important criteria: Security Efficiency, Scalability, Transparency, Manageability
Cellular IP
Operation:
„CIP Nodes“ maintain routing entries (soft state) for MNs
Multiple entries possible
Routing entries updated based on packets sent by MN
CIP Gateway:
Mobile IP tunnel endpoint
Initial registration processing
Security provisions:
all CIP Nodes share„network key“
MN key: MD5(net key, IP addr)
MN gets key upon registration