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Dynamic QoS tagging for RTP packets

A data packet and tagging technology, applied in data exchange network, digital transmission system, electrical components, etc., can solve the problems of unavailable deep packet inspection, false confirmation, etc.

Inactive Publication Date: 2012-05-23
ARUBA NETWORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

RTP stream encryption prevents attempts to identify RTP streams based on simple pattern recognition and / or regular expression matching of RTP payload data, because the encryption renders those RTP payloads unusable for deep packet inspection
Also, trying to identify RTP packets based solely on protocol header fields can lead to false acknowledgments due to small static packet formats

Method used

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  • Dynamic QoS tagging for RTP packets
  • Dynamic QoS tagging for RTP packets

Examples

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Embodiment Construction

[0009] Embodiments of the invention relate to methods of improving the handling of RTP streams in digital networks.

[0010] According to the invention, a switching device (eg, a controller, a bridge or an access point) in a digital network inspects the data flow flowing through the switching device. When the switching device detects that a session has been initiated, the switching device starts monitoring the flow for initial UDP packets until a predetermined number of packets have been monitored. The switching device monitors and discriminates the header portion of the UDP packet, looks for the RTP header bit pattern, ignores some RTP packet types, and caches other RTP packet types. This forensic processing continues, attempting to match cached packet header information with subsequent packets in the flow to deterministically detect RTP flows. If the stream is determined to be an RTP stream, the RTP type from the packet header is used to mark the stream. In one embodiment,...

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Abstract

Improved handling of RTP streams in digital networks. A switching device in a digital network such as a controller, bridge, or access point examines streams flowing through the device. The device monitors the initial UDP packets of a stream until a predetermined number of packets have been monitored. The device monitors and fingerprints the header portion of UDP packets, looking for RTP header bit patterns, ignoring certain RTP packet types, and caching others. This fingerprinting process attempts to match cached packet header information against subsequent packets in the stream to detect RTP streams. If the stream is determined to be an RTP stream, then the RTP type from the packet header is used to tag the stream. In one embodiment, such tags are QoS tags. Tagging may also be based on the control session port used.

Description

technical field [0001] The present invention relates to digital networks, and more particularly to transporting and managing reliable delivery of RTP streams. Background technique [0002] Digital networks have quickly become the backbone of many small and large businesses. Such networks are used to handle many different kinds of traffic. RTP (Real-Time Transport Protocol), defined in RFC 1889 and RFC 3550, defines the processing commonly used for streaming media such as voice, video, telephony, etc. [0003] Many applications that use RTP to deliver streaming media such as voice or video perform end-to-end encryption on their signaling sessions, which renders the Application Layer Gateway (ALG) ineffective as part of the firewall. RTP stream encryption prevents attempts to identify RTP streams based on simple pattern recognition and / or regular expression matching of RTP payload data, because the encryption makes those RTP payloads unavailable for deep packet inspection. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L69/40
CPCH04L29/06523H04L41/5022H04L65/608H04L65/607H04L29/06517H04L65/80H04L29/0651H04L65/70H04L65/65
Inventor 拉姆桑达·贾纳克拉曼拉文德·沃玛拉尼士·巴杰帕伊萨基·泽维尔
Owner ARUBA NETWORKS
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