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2.5.8 UniDirectional Link Routing (udlr)

NOTE: This charter is a snapshot of the 55th IETF Meeting in Altanta, Georgia USA. It may now be out-of-date.

Last Modifield: 06/24/2002

Emmanuel Duros <>
Hidetaka Izumiyama <>
Routing Area Director(s):
Bill Fenner <>
Alex Zinin <>
Routing Area Advisor:
Bill Fenner <>
Mailing Lists:
General Discussion:
To Subscribe:
Description of Working Group:
Note: An alternate site for UDLR's files is:

The UDLR working group issued the RFC 3077 in March 2001. This RFC describes a link-layer tunneling mechanism (LLTM) for supporting unidirectional links (UDL) in the Internet.

During the design of this mechanism by the UDLR working group, several implementations evolved. These implementations are fully interoperable and are currently being used in several operational environments.

As of the publication of RFC 3077, the working group has decided to further their work by issuing the following objectives:

1. Produce informational rfc's that describe in detail the requirements of example case study scenarios as listed below. Note that these scenarios relate to field experiments that are being undertaken based on the LLTM mechanism:

a) configuration of multicast routing protocols over a unidirectional link

b) configuration of unicast routing protocols over a unidirectional link

c) securing operation of a UDLR network

2. Identify security holes

3. Push the current document (RFC 3077) status to Draft Standard.

Goals and Milestones:
DEC 01  Submit I-D on the configuration of multicast routing protocols over a UDL
DEC 01  Submit I-D on the configuration of unicast routing protocols over a UDL
DEC 01  Submit I-D on securing operation of a UDLR network
MAR 02  Submit the Link Layer Tunneling Mechanism to the IESG for consideration as a Draft Standard
JUL 02  Submit Internet-drafts as Informational RFCs
  • - draft-ietf-udlr-dvmrp-conf-03.txt
  • - draft-ietf-udlr-multicast-issues-00.txt
  • Request For Comments:
    RFC3077 PS A Link Layer Tunneling Mechanism for Unidirectional Links

    Current Meeting Report

    Minutes of the UDLR WG at the 55th IETF
    Security implication draft (E. Duros)
    The security implication draft which is now obsolete will be submitted 
    again. Since the first submission of the draft, UDcast has been working on a 
    securing mechanism for UDLR and performed some experiments. New inputs 
    should be provided to the draft.
    Experiment draft (E. Duros & H. Izumiyama)
    A new draft is now available which describes the use of layer 2/3 
    protocols over UDLR in a satellite environment. It integrates previous 
    drafts (PPPoE over UDLR, PIM SM over UDLR, DVMRP over UDLR) as well as 
    describes new experiments (ARP over UDLR, DHCP over UDLR, PIM DM over 
    UDLR). This new draft obsoletes the previous ones. Limitations and issues 
    for each of the protocols are also described.
    Some sections are missing (e.g. DVMRP and PPPeE) are missing but should be 
    available soon in the next version of the draft.
    Document direction (G. Fairhurst) 
    Gorry raised several issue regarding the new draft:
     - should it be an experiment or a recommendation doccument ?
     - Could we have two documents instead ? E.g. one on unicast and one 
    mulitcast issues ? 
    We could not get the answers during the session, to be discussed on the 
    mailing list...


    Experiment Draft
    Security Implication Draft
    'Experiments with RFC 3077'