Following skype signaling footsteps

D. Rossi, M. Mellia, M. Meo
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引用次数: 11

Abstract

Skype is beyond any doubt the VoIP application in the current Internet. Its amazing success drawn the attention of telecom operators and the research community, both interested in knowing its internal mechanisms, characterizing its traffic, understanding its users' behavior. One of the most peculiar characteristics of Skype is that it relies on a P2P infrastructure for the exchange of signaling information that is distributed between active peers. Leveraging on the use of an accurate Skype classification engine that we recently proposed, we carry on an experimental study of Skype signaling based on extensive passive measurements collected from our campus LAN. In particular, we focus on the signaling traffic in the attempt of inferring some interesting properties of the overlay maintenance and, possibly, some hints about its structure. Our results show that, despite the signaling bandwidth used by normal peers is exiguous, it may however constitute a very significant portion of the total traffic generated by a Skype client - since, in order to guarantee reachability, Skype application is running most of the time even if no active call is in progress. Skype performs peer discovery and refresh by using a large number of single packets probes - which may be as effective for the purpose of the overlay maintenance as costly from the viewpoint of statefull layer-4 network devices. At the same time, single packet probes constitute only a minor portion of the signaling traffic: therefore, we dig into further details the traffic exchanged among more stable peers in the attempt of learning how the peer selection mechanism works.
跟随skype信号的脚步
Skype毫无疑问是当前互联网上的VoIP应用程序。它惊人的成功吸引了电信运营商和研究界的注意,他们都有兴趣了解它的内部机制,表征它的流量,了解它的用户行为。Skype最独特的特征之一是它依赖于P2P基础设施来交换分布在活动对等点之间的信令信息。利用我们最近提出的准确Skype分类引擎的使用,我们基于从校园局域网收集的广泛被动测量对Skype信令进行了实验研究。特别是,我们将重点放在信令流量上,试图推断覆盖维护的一些有趣特性,以及可能的关于其结构的一些提示。我们的结果表明,尽管正常对等端使用的信令带宽是微不足道的,但它可能构成Skype客户端产生的总流量的非常重要的一部分——因为,为了保证可达性,即使没有活动呼叫正在进行,Skype应用程序大部分时间也在运行。Skype通过使用大量的单数据包探测来执行对等点发现和刷新——从有状态的第4层网络设备的角度来看,这可能与覆盖维护的目的一样有效。同时,单包探测只占信令流量的一小部分:因此,我们进一步深入研究更稳定的对等体之间交换的流量,以尝试了解对等体选择机制是如何工作的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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