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

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

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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

Working of SIP Phone SIP RTP UDP IP Ethernet User Kernel

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

Client IP Simulation ARP broadcast ARP response Register request Client Server

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

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

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

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 SIP, RFC RTP, RFC SDP

23 Thank you !