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SUBHARTHI PAUL ET AL.
© 2010 Taylor & Francis Group, LLC
unicast) and different traffic engineering policies optimizing different
parameters, such as energy efficiency, congestion, latency, etc.
OpenADN Concepts
In this section, we explain some of the concepts required to under-
stand the OpenADN extensions that are described in the next section.
Waypoints
As previously discussed, the path between the user and the server may
consist of multiple segments connecting intermediate middleboxes,
proxies, or ADCs. Some of the middleboxes terminate TCP, and some
do not. We use the term waypoint to indicate all such intermediate
nodes. If a service is composed of multiple services, the packets may be
forwarded to multiple servers, with intermediate nodes bet ...