Mobile Ad Hoc Networks are generally considered as
stand-alone networks. However, in most practical cases of ad-hoc
networking, connectivity to the wider Internet may be possible via
some members of the ad-hoc network. If that connectivity is made
available to other members of the ad-hoc network, an interesting case
of ad-hoc network interconnected with Internet via multiple gateways
emerges. Such scenario gives raise to a number of challenges that
require solutions involving extensions to Mobile IP and ad-hoc routing
procedures, as well as careful planning of the scenarios under which
the use of Internet connectivity will be made. The paper discusses the
issues of Mobile IP agent registration, routing, and smooth gateway
handoff. A network architecture framework for supporting IP mobility
and communication across the boundary between adhoc network and the
wider Internet is proposed and discussed.