HP-UX Mobile IPv6 A.01.00 Administrator's Guide

Chapter 1
Introducing HP-UX Mobile IPv6
Establishing Route Optimization
16
Correspondent Node to Mobile Node Data Path in Route Optimization
In route optimization mode, the Correspondent Node sends data-packets directly to the Mobile Node. The
Correspondent Node uses the Mobile Node’s Care-of Address as the destination IP address and puts the
Mobile Node’s home address in a special IPv6 routing header for Mobile IPv6, a Type 2 routing header. In
effect, the Correspondent Node provides source routing for the data-packet, specifying that data-packets for
the Mobile Node’s home address are routed through the Mobile Node’s Care-of Address, as shown in
Figure 1-10, Data Path: Correspondent Node to Mobile Node in Route Optimization.
Figure 1-10 Data Path: Correspondent Node to Mobile Node in Route Optimization
When the Mobile Node receives the data-packet addressed to its Care-of Address, it processes the IPv6 header
and Type 2 routing header. The data-packet is presented to the upper layers as if it was received on the
Mobile Node’s home address—making Mobile IPv6 transparent to applications using the Mobile Node’s home
address.
Foreign Network
Home Network
Home Agent
Mobile Node
Correspondent
Node
Type 2 Routing Header:
Home Address
Src: Correspondent Node
Dest: Care-of Address