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RFC 8686
Title: Application-Layer Traffic Optimization (ALTO)
Cross‑Domain Server Discovery
Author: S. Kiesel,
M. Stiemerling
Status: Standards Track
Stream: IETF
Date: February 2020
Mailbox: [email protected],
[email protected]
Pages: 34
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-alto-xdom-disc-06.txt
URL: https://www.rfc-editor.org/info/rfc8686
DOI: 10.17487/RFC8686
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.
This document is a product of the Application-Layer Traffic Optimization
Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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