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GAIA VoIP traffic generator and analyzer

GAIA VoIP traffic generator and analyzer. Presentation by Amrut Bang Ashish Deshpande Vijay Gabale Santosh Patil. Sponsored by. Pune Institute of Computer Technology. GS Lab Pvt. Ltd. Agenda. Problem definition Need/Motivation

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GAIA VoIP traffic generator and analyzer

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  1. GAIA VoIP traffic generator and analyzer Presentation by Amrut Bang Ashish Deshpande Vijay Gabale Santosh Patil Sponsored by Pune Institute of Computer Technology GS Lab Pvt. Ltd

  2. Agenda • Problem definition • Need/Motivation • Existing solutions & limitations • Concept of VoIP traffic generator & analyzer • Features • Overall flow • System architecture • Immediate and long term goals • References

  3. Problem Definition To develop a system, for generating & analyzing VoIP traffic, capable of simulating multiple hosts on a single machine to test the performance of server applications.

  4. Need • Every application requires testing before deployment. Why? • To check the performance and the actual handling capacity under varying loads. • A mechanism to create the practical working conditions and analyze the target’s behavior in it.

  5. A Real World Problem • Small scale companies’ requirement. • To check scalability of the system. • Costs involved for multiple machines. • Complexity of maintaining network connections. • Real need : a N/W card and a software.

  6. Limitations of existing products • Commercial Applications – Costly, only for Windows. • No open source tool to simulate multiple hosts on a single machine for VoIP. • Applications only piecemeal, targeted at the developer. • Lack well structured & scriptable UI. • No comprehensive tool to support different codecs.

  7. Server

  8. Server

  9. Concept • Generation of VoIP traffic, simulating multiple hosts on a single machine. • Configuring & maintaining multiple different connections. • Analyzing the performance of target server application. • Precise measurement of testing parameters. • Generating reports and displaying results graphically. • Providing scriptable UI to help an expert.

  10. Abstract view of VoIP traffic generator and analyzer

  11. Working of SIP Phone SIP User RTP UDP Kernel IP Ethernet

  12. List of Clients ……………….. Client 1 Client 2 Client n Register Client 1 Client 2 ………………… Client n SIP RTP Client 1 Client 2 ………………… Client n UDP Client1 Client 2 ………………… Client n IP Client 1 Client 2 ………………… Client n ARP (IP Simulation) Ethernet Layer Network Hardware

  13. IP Simulation Client 172.16.0.21 Register request ARP response 172.16.0.5 172.16.0.22 ARP broadcast 172.16.0.23 Server Client

  14. Features • Create multiple clients and maintain communication between them. • Generation & capture of various packets (ARP,SIP, RTP). • Calculation of different performance parameters • Inputting load graphs • Decide No. of clients, Codec selection • Displaying server's response (Graph, Histogram, Dial)

  15. Demo !

  16. Overall Flow Displaying Server’s Response Operator GUI Scripts Shared Data Shared Data Target Server Application Packet Capture & Analysis Packet Generation Engine

  17. Client State Machine Client Registration Processing Logic Global Circular Buffer Condition Variable Signaling Call Initiation and Communication . . . . . Pack1 . . …….. N/2 N/2 Pack2 ……….. N Pack n Receiving thread LIBPCAP LIBNET Network Hardware

  18. Design Complexities • SIP stack implementation. • Efficient memory utilization. • pthread_mutex_trylock() instead of pthread_mutex_lock(). • pthread_cond_timedwait(). • OS Limitations: - Thread constraints - Maximum number of open files permitted

  19. GAIA Offers… • Multiple clients on a single machine. • Real traffic through simulated clients • Starting calls at different times & making them last for different durations. • Several codec formats & silent calls. • An entire VoIP network in a single box.

  20. Immediate Goals Modifying libnet library to eliminate buffer copies. Enhanced GUI and scriptable interface. Kernel component. Randomizing traffic generation. Scaling up by increasing no. of clients.

  21. Long Term Goals Incorporating more protocols. Distributed load generation.

  22. References Jung Shr Vu, Per-Yuang Wang, “The performance analysis of SIP-T signaling system in carrier class VoIP network”, Advanced Information Networking and Applications, ieeexplore.ieee.org A. Pescape, S. Avallone, G. Venter,“Distributed Internet Traffic Generator (D-ITG) Analysis & Experimentation over heterogeneous networks,Accepted poster at ICNP,2003 Andrew Tanenbaum,”Computer Networks”,Pearson Education Matthias Dalheimer,”Programming with Qt”, O’Reilly Mathews,”Professional Linux Programming” POSIX thread (pthread) library manuals RFC 3261- SIP, RFC 1889- RTP, RFC 2327- SDP

  23. Thank you !

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