PREFILLING A CACHE: A SATELLITE OVERVIEW

PREFILLING A CACHE: A SATELLITE OVERVIEW

1. Introduction

The topics detailed here follow the first experiments that were conducted in 1998 related to cache prefilling in a satellite context [1]. This work has already been presented during the IETF 44th meeting in the working groups UniDirectional Link Routing (UDLR) and Web Replication and Caching (WREC).
This document describes the multicast cache content delivery service designed and currently under test at France Telecom. This service works on an intranet and uses a network infrastructure that now associates terrestrial and satellite nodes. It also uses the cache prefilling module previously developed.
The first goal of the work was to extend the previously created satellite platform by associating it with a terrestrial Internet Protocol (IP) multicast network. The multicast diffusion of a predefined content to be prefilled within a cache was then tested on this platform using the reliable multicast protocol MFTP [2] over a heterogeneous network.
Afterwards, the work consisted of designing and testing the multicast cache content delivery service based on the following components:
• The multicast diffusion platform.
• TOP 100: Automatic cache feeding service of up-to-date web pages targeted for specific communities of interest.
• Cache content diffusion to users with mobility constraints.
• Security features when delivering cache content over satellite links.
For complete efficiency, this service needs to be easily integrated into a company’s information data system. For this reason, integration tests with the Tivoli software distribution framework were performed.