GAIA VoIP traffic generator and analyzer

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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
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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

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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.

A VoIP network in a box
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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 targets behavior in
  it.

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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.

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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.

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192.168.0.5
192.168.0.6
192.168.0.7
192.168.0.8
Server
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192.168.0.5
192.168.0.6
192.168.0.7
192.168.0.8
192.168.0.1
Server
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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.

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Abstract view of VoIP traffic generator and
analyzer
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Working of SIP Phone
SIP
User
RTP
UDP
Kernel
IP
Ethernet
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List of Clients
..
Client 1
Client 2
Client n
Register
Client n
Client 2
Client 1

SIP RTP
Client n
Client 2
Client 1

UDP
Client1
Client 2
Client n

IP
Client 1
Client 2
Client n

User
ARP (IP Simulation)
Ethernet Layer
Network Hardware
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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
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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)

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Demo !
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Overall Flow
Operator
Displaying Servers Response
Scripts
GUI
Shared Data
Shared Data
Target Server Application
Packet Generation Engine
Packet Capture Analysis
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Client Registration
Client State Machine
Processing Logic
Call Initiation and Communication
Condition Variable Signaling
Global Circular Buffer
. . . . .
Pack1
. .
..
N/2
N/2
Pack2
..
N
Packet Building
Pack n
Receiving thread
LIBPCAP
LIBNET
Network Hardware
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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

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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.

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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.

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Long Term Goals

• Incorporating more protocols.
• Distributed load generation.

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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,
  OReilly
• Mathews,Professional Linux Programming
• POSIX thread (pthread) library manuals
• RFC 3261- SIP, RFC 1889- RTP, RFC 2327- SDP

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Thank you !