Abstract
Today, most P2P applications do not consider locality
on the underlying network topology when choosing their
neighbors on the P2P routing layer. As a result,
participating peers may experience long delays and
peers' ISPs suffer from a large amount of (costly)
inter-ISP traffic. One potential solution to mitigate
these problems is to have ISPs or third parties convey
information regarding the underlying network topology to
P2P-clients through a dedicated service. Following this
approach, the IETF has recently formed an application
layer traffic optimization (ALTO) working group for
standardizing a protocol to enable P2P applications to
obtain information regarding network layer topology. This
paper comprises the problem space for such an ALTO
approach, taking into account recent developments in the
IETF ALTO Working Group. In particular, we will describe
requirements for an ALTO protocol identified in the IETF,
concrete protocols which have been proposed so far, and the
overall challenges. In addition, we will discuss related
issues such as privacy considerations, the relationship
of an ALTO service with existing caching solutions,
discovery mechanisms for an ALTO service, and security
considerations.
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