HP-UX IPv6 Transport Administrator's Guide for TOUR 2.0 (April 2004, rev 2)

Configuration
Stateless Autoconfiguration
Chapter 322
Again, in the above example, the address is automatically assigned. Note
that autoconfiguration is not mandatory, manual specification of the
address is also allowed and is described below.
Configuring Secondary Interfaces
If an IPv6 router that advertises network prefixes resides on the LAN, a
secondary interface is automatically configured after the primary
interface comes up. IPv6 builds additional secondary interfaces for each
network prefix advertised.
If you manually configure a link-local address for the primary interface,
then autoconfigured secondary addresses are derived from the interface
identifier part of the manually configured address for the primary
interface.
For example, if an IPv6 router on the LAN advertises two prefixes (such
as 3ffe::/64 and 2000::/64), HP-UX 11i v2 IPv6 configures two
secondary interfaces.
Configuring Route Information
HP-UX 11i v2 IPv6 automatically configures network routes based on
the prefix information received from an IPv6 router. HP-UX 11i v2 IPv6
automatically adds the router to its list of default gateways if the router
advertises a non-zero router-lifetime value.