[MMUSIC] I-D Action: draft-ietf-mmusic-media-path-middleboxes-04.txt
internet-drafts@ietf.org Mon, 30 January 2012 07:16 UTC
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Subject: [MMUSIC] I-D Action: draft-ietf-mmusic-media-path-middleboxes-04.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Multiparty Multimedia Session Control Working Group of the IETF. Title : Analysis of Middlebox Interactions for Signaling Protocol Communication along the Media Path Author(s) : Brian Stucker Hannes Tschofenig Gonzalo Salgueiro Filename : draft-ietf-mmusic-media-path-middleboxes-04.txt Pages : 22 Date : 2012-01-29 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. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-mmusic-media-path-middleboxes-04.txt Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ This Internet-Draft can be retrieved at: ftp://ftp.ietf.org/internet-drafts/draft-ietf-mmusic-media-path-middleboxes-04.txt
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