Abstract
The goal of Application-Layer Traffic Optimization (ALTO) is to
provide guidance to applications that have to select one or several hosts
from a set of candidates capable of providing a desired resource. ALTO is
realized by a client-server protocol. Before an ALTO client can ask for
guidance, it needs to discover one or more ALTO servers that can provide
suitable guidance.
In some deployment scenarios, in particular if the information about the
network topology is partitioned and distributed over several ALTO servers,
it may be necessary to discover an ALTO server outside of the ALTO
client's own network domain, in order to get appropriate guidance. This
document details applicable scenarios, itemizes requirements, and
specifies a procedure for ALTO cross-domain server discovery.
Technically, the procedure specified in this document takes one IP address
or prefix and a U-NAPTR Service Parameter (typically, ``ALTO:https'') as
parameters. It performs DNS lookups (for NAPTR resource records in the
``in-addr.arpa.'' or ``ip6.arpa.'' trees) and returns one or more URIs of
information resources related to that IP address or prefix.
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