Analysis of Middlebox Interactions for Signaling Protocol Communication along the Media Path
draft-ietf-mmusic-media-path-middleboxes-04

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Document Type Active Internet-Draft (mmusic WG)
Last updated 2012-01-29 (latest revision 2010-07-08)
Replaces draft-sipping-stucker-media-path-middleboxes
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MMUSIC                                                        B. Stucker
Internet-Draft                                              Unaffiliated
Intended status: Informational                             H. Tschofenig
Expires: August 2, 2012                           Nokia Siemens Networks
                                                            G. Salgueiro
                                                           Cisco Systems
                                                        January 30, 2012

            Analysis of Middlebox Interactions for Signaling
              Protocol Communication along the Media Path
            draft-ietf-mmusic-media-path-middleboxes-04.txt

Abstract

   Middleboxes are defined as any intermediary box performing functions
   apart from normal, standard functions of an IP router on the data
   path between a source host and destination host.  Two such functions
   are network address translation and firewalling.

   When Application Layer Gateways, such as SIP entities, interact with
   NATs and firewalls, as described in the MIDCOM architecture, then
   problems may occur in the transport of media traffic when signaling
   protocol interaction takes place along the media path, as it is the
   case for recent key exchange proposals (such as DTLS-SRTP).  This
   document highlights problems that may arise.  Unfortunately, it is
   difficult for the end points to detect or predict problematic
   behavior and to determine whether the media path is reliably
   available for packet exchange.

   This document aims to summarize the various sources and effects of
   NAT and firewall control, the reasons that they exist, and possible
   means of improving their behavior to allow protocols that rely upon
   signaling along the media path to operate effectively.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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

Stucker, et al.          Expires August 2, 2012                 [Page 1]
Internet-Draft           Middlebox Interactions             January 2012

   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 2, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Stucker, et al.          Expires August 2, 2012                 [Page 2]
Internet-Draft           Middlebox Interactions             January 2012

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Architecture . . . . . . . . . . . . . . . . . . . . . . . . .  5
   4.  Packet Filtering . . . . . . . . . . . . . . . . . . . . . . .  5
     4.1.  Protocol Interaction . . . . . . . . . . . . . . . . . . .  6
       4.1.1.  Single-Stage Commit  . . . . . . . . . . . . . . . . .  6
       4.1.2.  Two-Stage Commit . . . . . . . . . . . . . . . . . . .  8
     4.2.  Further Reading  . . . . . . . . . . . . . . . . . . . . . 10
   5.  NAT Traversal  . . . . . . . . . . . . . . . . . . . . . . . . 11
     5.1.  Protocol Interaction . . . . . . . . . . . . . . . . . . . 12
     5.2.  Further Reading  . . . . . . . . . . . . . . . . . . . . . 15
   6.  Interactions between Media Path Signaling and Middlebox
       Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
     6.1.  Packet Filtering . . . . . . . . . . . . . . . . . . . . . 16
     6.2.  NAT Traversal  . . . . . . . . . . . . . . . . . . . . . . 17
   7.  Preliminary Recommendations  . . . . . . . . . . . . . . . . . 18
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 19
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