An IP mobility solution for mobile network(s) that combines features of IP multicast
and mobile IPv6. The mobile network defines a mobile router (106) attached
to one or more mobile network hosts (102). Upon movement of the mobile network
from a home network to a foreign network, the mobile router obtains a multicast
care of address on behalf of the attached mobile network hosts and creates a binding
between the mobile subnet prefix and the multicast care of address. The mobile
router communicates the binding information, via binding update messages, to a
home agent (150) and to selected correspondent nodes (152) consistent
with requested privacy attributes of the mobile network hosts. The privacy attributes
allow the mobile network hosts to maintain the privacy of their care of address
(and implicitly, their location) relative to certain correspondent nodes.