draft-ietf-tram-stun-pmtud-05.txt   draft-ietf-tram-stun-pmtud-06.txt 
TRAM M. Petit-Huguenin TRAM M. Petit-Huguenin
Internet-Draft Impedance Mismatch Internet-Draft Impedance Mismatch
Intended status: Standards Track G. Salgueiro Intended status: Standards Track G. Salgueiro
Expires: August 24, 2017 Cisco Expires: March 5, 2018 Cisco
February 20, 2017 September 1, 2017
Path MTU Discovery Using Session Traversal Utilities for NAT (STUN) Path MTU Discovery Using Session Traversal Utilities for NAT (STUN)
draft-ietf-tram-stun-pmtud-05 draft-ietf-tram-stun-pmtud-06
Abstract Abstract
This document describes a Session Traversal Utilities for NAT (STUN) This document describes a Session Traversal Utilities for NAT (STUN)
Usage for Path MTU Discovery (PMTUD) between a client and a server. Usage for Path MTU Discovery (PMTUD) between a client and a server.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 24, 2017. This Internet-Draft will expire on March 5, 2018.
Copyright Notice Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License. described in the Simplified BSD License.
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Overview of Operations . . . . . . . . . . . . . . . . . . . 3 2. Overview of Operations . . . . . . . . . . . . . . . . . . . 3
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5 3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Probing Mechanisms . . . . . . . . . . . . . . . . . . . . . 5 4. Probing Mechanisms . . . . . . . . . . . . . . . . . . . . . 5
4.1. Simple Probing Mechanism . . . . . . . . . . . . . . . . 5 4.1. Simple Probing Mechanism . . . . . . . . . . . . . . . . 6
4.1.1. Sending a Probe Request . . . . . . . . . . . . . . . 5 4.1.1. Sending a Probe Request . . . . . . . . . . . . . . . 6
4.1.2. Receiving a Probe Request . . . . . . . . . . . . . . 6 4.1.2. Receiving a Probe Request . . . . . . . . . . . . . . 6
4.1.3. Receiving a Probe Response . . . . . . . . . . . . . 6 4.1.3. Receiving a Probe Response . . . . . . . . . . . . . 7
4.2. Complete Probing Mechanism . . . . . . . . . . . . . . . 6 4.2. Complete Probing Mechanism . . . . . . . . . . . . . . . 7
4.2.1. Sending the Probe Indications and Report Request . . 7 4.2.1. Sending the Probe Indications and Report Request . . 7
4.2.2. Receiving an ICMP Packet . . . . . . . . . . . . . . 7 4.2.2. Receiving an ICMP Packet . . . . . . . . . . . . . . 8
4.2.3. Receiving a Probe Indication and Report Request . . . 8 4.2.3. Receiving a Probe Indication and Report Request . . . 8
4.2.4. Receiving a Report Response . . . . . . . . . . . . . 8 4.2.4. Receiving a Report Response . . . . . . . . . . . . . 9
4.2.5. Using Checksums as Packet Identifiers . . . . . . . . 9 4.2.5. Using Checksums as Packet Identifiers . . . . . . . . 9
4.2.6. Using Sequence Numbers as Packet Identifiers . . . . 9 4.2.6. Using Sequence Numbers as Packet Identifiers . . . . 10
5. Probe Support Signaling Mechanisms . . . . . . . . . . . . . 10 5. Probe Support Signaling Mechanisms . . . . . . . . . . . . . 10
5.1. Explicit Probe Support Signaling Mechanism . . . . . . . 10 5.1. Explicit Probe Support Signaling Mechanism . . . . . . . 11
5.2. Implicit Probe Support Signaling Mechanism . . . . . . . 11 5.2. Implicit Probe Support Signaling Mechanism . . . . . . . 11
6. STUN Attributes . . . . . . . . . . . . . . . . . . . . . . . 11 6. STUN Attributes . . . . . . . . . . . . . . . . . . . . . . . 11
6.1. IDENTIFIERS . . . . . . . . . . . . . . . . . . . . . . . 11 6.1. IDENTIFIERS . . . . . . . . . . . . . . . . . . . . . . . 11
6.2. PMTUD-SUPPORTED . . . . . . . . . . . . . . . . . . . . . 11 6.2. PMTUD-SUPPORTED . . . . . . . . . . . . . . . . . . . . . 11
7. Security Considerations . . . . . . . . . . . . . . . . . . . 11 7. Security Considerations . . . . . . . . . . . . . . . . . . . 12
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
8.1. New STUN Methods . . . . . . . . . . . . . . . . . . . . 12 8.1. New STUN Methods . . . . . . . . . . . . . . . . . . . . 12
8.2. New STUN Attributes . . . . . . . . . . . . . . . . . . . 12 8.2. New STUN Attributes . . . . . . . . . . . . . . . . . . . 12
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 12 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
9.1. Normative References . . . . . . . . . . . . . . . . . . 12 9.1. Normative References . . . . . . . . . . . . . . . . . . 12
9.2. Informative References . . . . . . . . . . . . . . . . . 13 9.2. Informative References . . . . . . . . . . . . . . . . . 13
Appendix A. Release Notes . . . . . . . . . . . . . . . . . . . 13 Appendix A. Release Notes . . . . . . . . . . . . . . . . . . . 13
A.1. Modifications between draft-ietf-tram-stun-pmtud-04 and A.1. Modifications between draft-ietf-tram-stun-pmtud-06 and
draft-ietf-tram-stun-pmtud-03 . . . . . . . . . . . . . . 13 draft-ietf-tram-stun-pmtud-05 . . . . . . . . . . . . . . 13
A.2. Modifications between draft-ietf-tram-stun-pmtud-03 and A.2. Modifications between draft-ietf-tram-stun-pmtud-05 and
draft-ietf-tram-stun-pmtud-02 . . . . . . . . . . . . . . 13 draft-ietf-tram-stun-pmtud-04 . . . . . . . . . . . . . . 14
A.3. Modifications between draft-ietf-tram-stun-pmtud-02 and A.3. Modifications between draft-ietf-tram-stun-pmtud-04 and
draft-ietf-tram-stun-pmtud-01 . . . . . . . . . . . . . . 14 draft-ietf-tram-stun-pmtud-03 . . . . . . . . . . . . . . 14
A.4. Modifications between draft-ietf-tram-stun-pmtud-01 and A.4. Modifications between draft-ietf-tram-stun-pmtud-03 and
draft-ietf-tram-stun-pmtud-00 . . . . . . . . . . . . . . 14 draft-ietf-tram-stun-pmtud-02 . . . . . . . . . . . . . . 14
A.5. Modifications between draft-ietf-tram-stun-pmtud-00 and A.5. Modifications between draft-ietf-tram-stun-pmtud-02 and
draft-petithuguenin-tram-stun-pmtud-01 . . . . . . . . . 14 draft-ietf-tram-stun-pmtud-01 . . . . . . . . . . . . . . 15
A.6. Modifications between draft-petithuguenin-tram-stun- A.6. Modifications between draft-ietf-tram-stun-pmtud-01 and
draft-ietf-tram-stun-pmtud-00 . . . . . . . . . . . . . . 15
A.7. Modifications between draft-ietf-tram-stun-pmtud-00 and
draft-petithuguenin-tram-stun-pmtud-01 . . . . . . . . . 15
A.8. Modifications between draft-petithuguenin-tram-stun-
pmtud-01 and draft-petithuguenin-tram-stun-pmtud-00 . . . 15 pmtud-01 and draft-petithuguenin-tram-stun-pmtud-00 . . . 15
A.7. Modifications between draft-petithuguenin-tram-stun- A.9. Modifications between draft-petithuguenin-tram-stun-
pmtud-00 and draft-petithuguenin-behave-stun-pmtud-03 . . 15 pmtud-00 and draft-petithuguenin-behave-stun-pmtud-03 . . 15
A.8. Modifications between draft-petithuguenin-behave-stun-
pmtud-03 and draft-petithuguenin-behave-stun-pmtud-02 . . 15
A.9. Modifications between draft-petithuguenin-behave-stun-
pmtud-02 and draft-petithuguenin-behave-stun-pmtud-01 . . 15
A.10. Modifications between draft-petithuguenin-behave-stun- A.10. Modifications between draft-petithuguenin-behave-stun-
pmtud-03 and draft-petithuguenin-behave-stun-pmtud-02 . . 15
A.11. Modifications between draft-petithuguenin-behave-stun-
pmtud-02 and draft-petithuguenin-behave-stun-pmtud-01 . . 16
A.12. Modifications between draft-petithuguenin-behave-stun-
pmtud-01 and draft-petithuguenin-behave-stun-pmtud-00 . . 16 pmtud-01 and draft-petithuguenin-behave-stun-pmtud-00 . . 16
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 16 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 16
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16
1. Introduction 1. Introduction
The Packetization Layer Path MTU Discovery (PMTUD) specification The Packetization Layer Path MTU Discovery (PMTUD) specification
[RFC4821] describes a method to discover the Path MTU but does not [RFC4821] describes a method to discover the Path MTU but does not
describe a practical protocol to do so with UDP. describe a practical protocol to do so with UDP.
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UDP. A router on the path to the server can reject this request with UDP. A router on the path to the server can reject this request with
an ICMP message or drop it. an ICMP message or drop it.
4.1.1. Sending a Probe Request 4.1.1. Sending a Probe Request
A client forms a Probe Request by using the Probe Method and A client forms a Probe Request by using the Probe Method and
following the rules in Section 7.1 of [RFC5389]. following the rules in Section 7.1 of [RFC5389].
The Probe transaction MUST be authenticated if the Simple Probing The Probe transaction MUST be authenticated if the Simple Probing
mechanism is used in conjunction with the Implicit Probing Support mechanism is used in conjunction with the Implicit Probing Support
mechanism described in Section 5.2 If not, the Probe transaction MAY mechanism described in Section 5.2. If not, the Probe transaction
be authenticated. MAY be authenticated.
The client adds a PADDING [RFC5780] attribute with a length that, The client adds a PADDING [RFC5780] attribute with a length that,
when added to the IP and UDP headers and the other STUN components, when added to the IP and UDP headers and the other STUN components,
is equal to the Selected Probe Size, as defined in [RFC4821] is equal to the Selected Probe Size, as defined in [RFC4821]
Section 7.3. The client MUST add the FINGERPRINT attribute so the Section 7.3. The client MUST add the FINGERPRINT attribute so the
STUN messages are disambiguated from the other protocol packets. STUN messages are disambiguated from the other protocol packets.
Then the client sends the Probe Request to the server over UDP with Then the client sends the Probe Request to the server over UDP with
the DF bit set. For the purpose of this transaction, the Rc the DF bit set. For the purpose of this transaction, the Rc
parameter specified in Section 7.2.1 of [RFC5389] is set to 3. The parameter specified in Section 7.2.1 of [RFC5389] is set to 3. The
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probing support in the reverse direction MUST be authenticated to probing support in the reverse direction MUST be authenticated to
prevent amplification attacks. prevent amplification attacks.
6. STUN Attributes 6. STUN Attributes
6.1. IDENTIFIERS 6.1. IDENTIFIERS
The IDENTIFIERS attribute carries a chronologically ordered list of The IDENTIFIERS attribute carries a chronologically ordered list of
UDP packet identifiers. UDP packet identifiers.
While Sections Section 4.2.5 and Section 4.2.6 describe two possible While Section 4.2.5 and Section 4.2.6 describe two possible methods
methods for acquiring and formatting the identifiers used for this for acquiring and formatting the identifiers used for this purpose,
purpose, ultimately each protocol has to define how these identifiers ultimately each protocol has to define how these identifiers are
are acquired and formatted. Therefore, the contents of the acquired and formatted. Therefore, the contents of the IDENTIFIERS
IDENTIFIERS attribute is opaque. attribute is opaque.
6.2. PMTUD-SUPPORTED 6.2. PMTUD-SUPPORTED
The PMTUD-SUPPORTED attribute indicates that its sender supports this The PMTUD-SUPPORTED attribute indicates that its sender supports this
specification. This attribute has no value part and thus the specification. This attribute has no value part and thus the
attribute length field is 0. attribute length field is 0.
7. Security Considerations 7. Security Considerations
The PMTUD mechanism described in this document does not introduce any The PMTUD mechanism described in this document does not introduce any
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[RFC5780] MacDonald, D. and B. Lowekamp, "NAT Behavior Discovery [RFC5780] MacDonald, D. and B. Lowekamp, "NAT Behavior Discovery
Using Session Traversal Utilities for NAT (STUN)", Using Session Traversal Utilities for NAT (STUN)",
RFC 5780, DOI 10.17487/RFC5780, May 2010, RFC 5780, DOI 10.17487/RFC5780, May 2010,
<http://www.rfc-editor.org/info/rfc5780>. <http://www.rfc-editor.org/info/rfc5780>.
Appendix A. Release Notes Appendix A. Release Notes
This section must be removed before publication as an RFC. This section must be removed before publication as an RFC.
A.1. Modifications between draft-ietf-tram-stun-pmtud-04 and draft- A.1. Modifications between draft-ietf-tram-stun-pmtud-06 and draft-
ietf-tram-stun-pmtud-05
o Nits.
o Restore missing changelog for previous version.
A.2. Modifications between draft-ietf-tram-stun-pmtud-05 and draft-
ietf-tram-stun-pmtud-04
o Modifications following Brandon Williams review.
A.3. Modifications between draft-ietf-tram-stun-pmtud-04 and draft-
ietf-tram-stun-pmtud-03 ietf-tram-stun-pmtud-03
o Modifications following Simon Perreault and Brandon Williams o Modifications following Simon Perreault and Brandon Williams
reviews. reviews.
A.2. Modifications between draft-ietf-tram-stun-pmtud-03 and draft- A.4. Modifications between draft-ietf-tram-stun-pmtud-03 and draft-
ietf-tram-stun-pmtud-02 ietf-tram-stun-pmtud-02
o Add new Overview of Operations section with ladder diagrams. o Add new Overview of Operations section with ladder diagrams.
o Authentication is mandatory for the Complete Probing mechanism, o Authentication is mandatory for the Complete Probing mechanism,
optional for the Simple Probing mechanism. optional for the Simple Probing mechanism.
o All the ICE specific text moves to a separate draft to be o All the ICE specific text moves to a separate draft to be
discussed in the ICE WG. discussed in the ICE WG.
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o Each usage of this specification must the format of the o Each usage of this specification must the format of the
IDENTIFIERS attribute contents. IDENTIFIERS attribute contents.
o Better define the implicit signaling mechanism. o Better define the implicit signaling mechanism.
o Extend the Security Consideration section. o Extend the Security Consideration section.
o Tons of nits. o Tons of nits.
A.3. Modifications between draft-ietf-tram-stun-pmtud-02 and draft- A.5. Modifications between draft-ietf-tram-stun-pmtud-02 and draft-
ietf-tram-stun-pmtud-01 ietf-tram-stun-pmtud-01
o Cleaned up references. o Cleaned up references.
A.4. Modifications between draft-ietf-tram-stun-pmtud-01 and draft- A.6. Modifications between draft-ietf-tram-stun-pmtud-01 and draft-
ietf-tram-stun-pmtud-00 ietf-tram-stun-pmtud-00
o Added Security Considerations Section. o Added Security Considerations Section.
o Added IANA Considerations Section. o Added IANA Considerations Section.
A.5. Modifications between draft-ietf-tram-stun-pmtud-00 and draft- A.7. Modifications between draft-ietf-tram-stun-pmtud-00 and draft-
petithuguenin-tram-stun-pmtud-01 petithuguenin-tram-stun-pmtud-01
o Adopted by WG - Text unchanged. o Adopted by WG - Text unchanged.
A.6. Modifications between draft-petithuguenin-tram-stun-pmtud-01 and A.8. Modifications between draft-petithuguenin-tram-stun-pmtud-01 and
draft-petithuguenin-tram-stun-pmtud-00 draft-petithuguenin-tram-stun-pmtud-00
o Moved some Introduction text to the Probing Mechanism section. o Moved some Introduction text to the Probing Mechanism section.
o Added cross-reference to the other two STUN troubleshooting o Added cross-reference to the other two STUN troubleshooting
mechanism drafts. mechanism drafts.
o Updated references. o Updated references.
o Added Gonzalo Salgueiro as co-author. o Added Gonzalo Salgueiro as co-author.
A.7. Modifications between draft-petithuguenin-tram-stun-pmtud-00 and A.9. Modifications between draft-petithuguenin-tram-stun-pmtud-00 and
draft-petithuguenin-behave-stun-pmtud-03 draft-petithuguenin-behave-stun-pmtud-03
o General refresh for republication. o General refresh for republication.
A.8. Modifications between draft-petithuguenin-behave-stun-pmtud-03 and A.10. Modifications between draft-petithuguenin-behave-stun-pmtud-03
draft-petithuguenin-behave-stun-pmtud-02 and draft-petithuguenin-behave-stun-pmtud-02
o Changed author address. o Changed author address.
o Changed the IPR to trust200902. o Changed the IPR to trust200902.
A.9. Modifications between draft-petithuguenin-behave-stun-pmtud-02 and A.11. Modifications between draft-petithuguenin-behave-stun-pmtud-02
draft-petithuguenin-behave-stun-pmtud-01 and draft-petithuguenin-behave-stun-pmtud-01
o Defined checksum and sequential numbers as possible packet o Defined checksum and sequential numbers as possible packet
identifiers. identifiers.
o Updated the reference to RFC 5389 o Updated the reference to RFC 5389
o The FINGERPRINT attribute is now mandatory. o The FINGERPRINT attribute is now mandatory.
o Changed the delay between Probe indication and Report request to o Changed the delay between Probe indication and Report request to
be RTO/2 or 50 milliseconds. be RTO/2 or 50 milliseconds.
o Added ICMP packet processing. o Added ICMP packet processing.
o Added Full-Stop Timeout detection. o Added Full-Stop Timeout detection.
o Stated that Binding request with PMTUD-SUPPORTED does not start o Stated that Binding request with PMTUD-SUPPORTED does not start
the PMTUD process if already started. the PMTUD process if already started.
A.10. Modifications between draft-petithuguenin-behave-stun-pmtud-01 A.12. Modifications between draft-petithuguenin-behave-stun-pmtud-01
and draft-petithuguenin-behave-stun-pmtud-00 and draft-petithuguenin-behave-stun-pmtud-00
o Removed the use of modified STUN transaction but shorten the o Removed the use of modified STUN transaction but shorten the
retransmission for the simple probing mechanism. retransmission for the simple probing mechanism.
o Added a complete probing mechanism. o Added a complete probing mechanism.
o Removed the PADDING-RECEIVED attribute. o Removed the PADDING-RECEIVED attribute.
o Added release notes. o Added release notes.
 End of changes. 26 change blocks. 
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