rfc3145.txt

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RFC 3145           L2TP Disconnect Cause Information           July 2001


   19   NCP failure: failed to converge on acceptable addresses.

        Valid Direction values are:

           1: Too many Configure-Naks received from peer.
           2: Too many Configure-Naks sent to peer.

   20   NCP failure: user not permitted to use any addresses.

        Valid Direction values are:

           1: Local link address not acceptable to peer.
           2: Remote link address not acceptable to local system.

4.  Notes

   This AVP MAY may be sent by either the LNS or LAC.  It is generally
   expected that this AVP will be most useful in sending notification
   from the LNS to LAC in the compulsory tunneling case, although it is
   not precluded from use in any other case.

   A draft form of this AVP used Vendor ID 43 (3Com Corporation) and
   vendor-specific Attribute Type 46.  Implementations MAY accept AVPs
   with these values as equivalent to the message described in this
   document, but SHOULD NOT transmit an AVP using these values.

5.  Security Considerations

   The integrity and confidentiality of this AVP relies on the
   underlying L2TP security mechanisms.  It is intended for logging and
   diagnostic purposes in the event of PPP link failure and should not
   pose a threat to system security, but the AVP MAY be hidden as
   described in section 4.3 of RFC 2661.

   The defined extension does not provide information that would be
   useful to an attacker.  Future extensions should not be defined to
   lessen security.  For instance, it is inappropriate to provide
   distinguishing information that would inform the peer that a given
   authentication name is correct, but the password/secret is incorrect.












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RFC 3145           L2TP Disconnect Cause Information           July 2001


6.  IANA Considerations

   IANA has assigned an L2TP Attribute Type value of 46 for the PPP
   Disconnect Cause Code defined in Section 2.

   This AVP includes an enumerated cause code value, called the
   "Disconnect Code."  Values 0 through 20 are described in this
   document.  Values 21 through 32767 (inclusive) are assigned by the
   IANA subject to IESG Approval.  Values 32768 through 65279
   (inclusive) are assigned by the IANA on a First Come First Served
   basis, and are intended for vendor-specific features.  Values 65280
   through 65535 (inclusive) are allocated for Private or Experimental
   Use, and no assignment through the IANA is expected.

7.  References

   [1] Townsley, W., Valencia, A., Rubens, A., Pall, G., Zorn, G. and B.
       Palter, "Layer 2 Tunnel Protocol (L2TP)", RFC 2661, August 1999.

   [2] Bradner, S., "Key words for use in RFCs to Indicate Requirement
       Levels", BCP 14, RFC 2119, March 1997.

   [3] Yergeau, F., "UTF-8, a transformation format of ISO 10646", RFC
       2279, January 1998.

8.  Acknowledgments

   The authors thank W. Mark Townsley and Thomas Narten for their
   comments and help.






















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9.  Contacts

9.1.  L2TP Working Group Chair

   W. Mark Townsley
   Cisco Systems
   7025 Kit Creek Road
   PO Box 14987
   Research Triangle Park, NC 27709

   EMail:  [e-mail]

9.2.  Authors' Addresses

   Rohit Verma
   180 N. Stetson Avenue
   Chicago IL 60601

   Phone:  [phone]
   Fax:    [phone]
   EMail:  [e-mail]


   Madhvi Verma
   3800 Golf Road
   Rolling Meadows IL 60008

   Phone:  [phone]
   Fax:    [phone]
   EMail:  [e-mail]


   James Carlson
   Sun Microsystems
   1 Network Drive MS UBUR02-212
   Burlington MA  01803-2757

   Phone:  [phone]
   Fax:    [phone]
   EMail:  [e-mail]











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RFC 3145           L2TP Disconnect Cause Information           July 2001


10.  Standard Notices

10.1.  IETF Intellectual Property Statement

   The IETF takes no position regarding the validity or scope of any
   intellectual property or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; neither does it represent that it
   has made any effort to identify any such rights.  Information on the
   IETF's procedures with respect to rights in standards-track and
   standards-related documentation can be found in BCP 11.  Copies of
   claims of rights made available for publication and any assurances of
   licenses to be made available, or the result of an attempt made to
   obtain a general license or permission for the use of such
   proprietary rights by implementers or users of this specification can
   be obtained from the IETF Secretariat.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights, which may cover technology that, may be required to practice
   this standard.  Please address the information to the IETF Executive
   Director.




























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Full Copyright Statement

   Copyright (C) The Internet Society (2001).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
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   document itself may not be modified in any way, such as by removing
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   The limited permissions granted above are perpetual and will not be
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   This document and the information contained herein is provided on an
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Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.



















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