HP-UX IPSec version A.02.00 Administrator's Guide

HP-UX IPSec and HP-UX Mobile IPv6
Introduction
Chapter 7206
Prefix Discovery Packets Between the Home Agent and Mobile
Node
RFC 3776 specifies that you should use ESP to secure ICMPv6 Mobile
Prefix Solicitation and Mobile Prefix Advertisement messages
between the Home Agent and Mobile Node. (See Appendix A, “RFC 3776
Mandatory Support” on page 279 for the RFC 3776 extract.)
Prefix Discovery allows a Mobile Node to get network prefix information
about its Home Network and to configure its Home Address if needed.
The Home Agent monitors prefix information from Router
Advertisement messages on the Home Network. The Mobile Node can
request prefix information by sending a Mobile Prefix Solicitation
message to the Home Agent.
Payload Packets Routed Through the Home Agent
RFC 3776 specifies that you may use ESP to secure payload (data)
packets between Mobile Nodes and Correspondent Nodes when these
packets are forwarded through the Home Agent. (See Appendix A, “RFC
3776 Mandatory Support” on page 279 for the RFC 3776 extract.) Data
packets between the Mobile Node and the Correspondent Nodes are
forwarded through the Home Agent in Basic Operation, which is used
when Route Optimization is not established.
RFC 3776 also specifies that if the Home Agent supports stateful address
autoconfiguration (such as DHCPv6) for the Mobile Nodes, or supports
multicast group membership control protocols, the IPSec
implementation must support payload protection, but using it is not
mandatory.