INTERNET-DRAFT "Network Working Group" G. Chanteau Y. Codaccioni V. Faineant Document: draft-ietf-udlr-pppoe-00.txt France Telecom Expires: April 2002 November 2001 Using PPPoE with LLTM Mechanism Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. Abstract This memo describes the use and the configuration of the PPPoE over a UniDirectionnal Link such as satellite network. This document explains the advantages of the PPPoE and LLTM in such architecture. Table of Contents Status of this Memo .............................................. 1 Abstract ......................................................... 1 1. Introduction ................................................... 2 2. Network architecture ........................................... 2 2.1 Equipments description ......................................... 3 2.2 Connections description ........................................ 3 2.3 Multicast....................................................... 3 3. Advantages ..................................................... 4 4. Evolutions .................................................... 5 4.1 Multi-receiver connectivity .................................... 5 5. References .................................................... 6 6. Author's Addresses ............................................ 6 7. Full copyright statement ...................................... 7 Chanteau & Codaccioni & Faineant [Page 1] INTERNET-DRAFT Using PPPoE with LLTM November 2001 1. Introduction The initial idea was to create a real satellite local loop where a satellite broadband Internet access can replace a terrestrial one in areas that are non covered by terrestrial high speed Internet access such as ADSL. This architecture remains open and in order to provide the same type of services than in ADSL networks, an interconnection with a Broadband Access Server (BAS) is needed. This interconnection uses the PPPoE (PPP over Ethernet). This document explains the advantages of the PPPoE and LLTM [RFC 3077] in such a satellite Local Loop : compatibility with all IP world and performances equivalent to ADSL. It also shows the possible evolutions of this architecture. 2. Network architecture Unidirectional Link -------------<----------- | | | | | | | | | | \|/ . . /|\ | | --------- --------- -------- Ethernet | PPPoE/| IP Networks | LLTM | PPPoE | BAS | -------| LLTM |-------->------|Server |---------| | | Router| | | | | | --------- --------- -------- | ____ | |--|PC| | | ---- -------- | ____ LAN | ISP | |--|PC| -------- | ---- Figure 1 : Connectivity to a BAS via PPPoE/LLTM In the Figure 1, the Connections without any arrow are bidirectionnal. Chanteau & Codaccioni & Faineant [Page 2] INTERNET-DRAFT Using PPPoE with LLTM November 2001 2.1. Equipments description Here are the description of the main equipments of this architecture : - the end user is a PC on a LAN. It integrates an Ethernet card. - the satellite terminal is a router with an LLTM client (implementing the RFC 3077). It integrates one satellite reception card, one Ethernet card and one bidirectional interface connected to the Internet. Firstly, it transports the traffic from the end users to the Internet via the return channel which can be either satellite or terrestrial. Secondly, it receives traffic from the DVB channel (previously coming from the Internet) via its DVB interface and deliver it to the end users. - the LLTM server (implementing the RFC 3077) is acting as an Ethernet bridge. This is the endpoint of the GRE tunnel where traffic is encapsulated and decapsulated. The LLTM server is directly connected to a BAS. - the BAS (Broadband Access Server) manages the PPPoE connection. The PPPoE can end into the BAS (open model) or continue and end into the RADIUS server of an ISP (closed model). The PPPoE authentication is done where the PPPoE tunnel ends. 2.2 Connections description (Unicast) Here are the different steps of a connection to Internet : - when an end user tries to go on the Internet, the satellite terminal implements the LLTM : it initiates first a GRE tunnel between its DVB interface and the LLTM server. Now a LAN has been emulated and all the Ethernet frames can be directed to the LLTM server and therefore to the BAS. Chanteau & Codaccioni & Faineant [Page 3] INTERNET-DRAFT Using PPPoE with LLTM November 2001 - the satellite terminal exchanges pieces of information with the BAS (initiation session) in order to initiate the PPPoE session. - In case of cloded model the BAS redirect the PPP connection to the right ISP through a L2TP tunnel. - the end user can connect to a distant server of the Internet. 2.3 Multicast It is important to notice that PPPoE supports only PPP connection for Unicast flows. The multicast is provided directly by the ASP using IP over LLTM. In this configuration, the ASP can offer n to m multicast services. There is also possibility to offer the Mbone connectity through the BAS without using PPPoE. 3. Advantages The Local Satellite Loop architecture offers the following advantages : - a return channel flexibility : the use of LLTM allows to define an access network wether with a satellite return channel or with a terrestrial return channel. Besides a standby terrestrial link can be used automatically in case of failure of the satellite return channel. - a multi-ISP configuration for the Internet access. - a difference is made between the ASP and the ISP - complementarity with the ADSL network : * performances : more than 128 kbps for the return channel and up to 40 Mbps for a gateway throughput * client segmentation : corporate or residential * interconnection with the terrestrial network * reduction of the access costs * re-use of the ADSL management system (accounting, billing, etc.) - interactif Multicast support (m to m) Chanteau & Codaccioni & Faineant [Page 4] INTERNET-DRAFT Using PPPoE with LLTM November 2001 4. Conclusion The Local Satellite Loopb architecture has been already validated in laboratory. A real experimentation will begin on the fourth quarter of 2001 with a few tens of satellite terminals. Different evolutions are studied on multicast and security aspects. 5. References [UDLR] E. Duros, W. Dabbous, H. Izumiyama, N. Fujii, Y. Zhang, "A Link-Layer Tunneling Mechanism for Unidirectional Links", RFC 3077, March 2001 [PPPoE] L. Mamakos, K. Lidl, J. Evarts, D. Carrel, D. Simone, R. Wheeler, "A Method for Transmitting PPP Over Ethernet (PPPoE)", RFC 2516, February 1999 [GRE] D. Farinacci, T. Li, S. Hanks, D. Meyer, P. Traina, "Generic Routing Encapsulation (GRE)", RFC 2784, March 2000 6. Author's Addresses Gilles Chanteau France Telecom R&D 38/40 rue du G‰n‰ral Leclerc 92131 Issy-Les-Moulineaux Cedex France Phone: (+33) 1 45 29 58 67 EMail : gilles.chanteau@rd.francetelecom.com Yann Codaccioni France Telecom R&D 38/40 rue du G‰n‰ral Leclerc 92131 Issy-Les-Moulineaux Cedex France Phone: (+33) 1 45 29 64 67 EMail : yann.codaccioni@rd.francetelecom.com Virginie Fain‰ant France Telecom R&D 38/40 rue du G‰n‰ral Leclerc 92131 Issy-Les-Moulineaux Cedex France Phone: (+33) 1 45 29 EMail : virginie.faineant@rd.francetelecom.com Chanteau & Codaccioni & Faineant [Page 5] INTERNET-DRAFT Using PPPoE with LLTM November 2001 7. Full copyright statement Copyright (C) The Internet Society (1999). All Rights Reserved. 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