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Novel Internet applications demand for global availability of
complex services that can adapt dynamically to application
requirements. At the same time, pervasive Internet usage and
heterogeneous access technologies impose new challenges for service
deployment. We present {Spontaneous Virtual Networks (SpoVNet)}, a
methodology that enables easy development of new services with
transparent support for mobility, multi-homing, and heterogeneous
environments. This article presents the overlay-based architecture
of SpoVNet that supports the spontaneous deployment of new services
as well as a seamless transition towards future networks.
SpoVNet's architecture offers support for the underlay aware
adaptation of overlays by the use of cross-layer information. In the
context of two exemplary services like a group communication service
and an event service as well as two demanding applications -- a
realtime online game and a video streaming application -- we
illustrate how SpoVNet is of value in establishing services and
applications for the Next Generation Internet.
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