Currently, the rapid development of new multimedia services including VoIP, video streaming and video on demand as well as IPTV and the integration of triple play into the service portfolios of ISPs and network operators indicate an evolutionary path towards next generation networking. Peer-topeer (P2P) overlay networks are used with growing intensity to implement the content dissemination and control planes of many new portals and their multimedia service components like GoalBit, Zattoo, PPLive, SopCast, Voddler or Skype. However, despite intensive measurement campaigns (cf. [3], [4] among others), publicly available integrated systems to monitor streaming traffic in such networks and to analyze its features are rarely provided yet. The presented JAVA tool Atheris constitutes an approach to overcome this deficiency.