SlideServe
Télécharger Obtenir Pro
Menu
Accueil Pro
Préférences
ApparenceLight Aide et commentaires
© SlideServe · v2026

Network Performance Measurement

flower avatar
flower
16 diapositives · 478 Views · Oct 24, 2012

Network Performance Measurement. Introduction Classification of Measurement. Tools and Techniques. Examples. Conclusion. Introduction. Parameters which measured are: Bandwidth – Data transferred / time Delay - Time taken for data to transfer (App level)

Network Performance Measurement - slide 1
01 / 16Network Performance Measurement
1 / 17

Télécharger la présentation

Network Performance Measurement
Une image / un lien ci-dessous est fourni (tel quel) pour télécharger la présentation

Politique de téléchargement : le contenu du site vous est fourni TEL QUEL pour votre information et votre usage personnel ; il ne peut être vendu, concédé sous licence ni partagé sur d’autres sites sans l’accord de son auteur.Le contenu vous est fourni TEL QUEL, pour votre information et votre usage personnel uniquement. Téléchargez la présentation en cliquant sur ce lien. Lors du téléchargement, si vous ne parvenez pas à télécharger une présentation, l’éditeur a peut-être supprimé le fichier de son serveur.Pendant le téléchargement, si vous ne parvenez pas à obtenir une présentation, le fichier a peut-être été supprimé par l’éditeur.

F I N

Plus de contenu associé

Transcription de la présentation

  1. Network Performance Measurement Introduction Classification of Measurement. Tools and Techniques. Examples. Conclusion.

  2. Introduction. • Parameters which measured are: • Bandwidth – Data transferred / time • Delay - Time taken for data to transfer (App level) • Packet Loss – Affects Throughput and Apps. • High Bandwidth. • Small Delay • Low Packet loss

  3. Classification of Measurement • LAN , Backbone , End-to-End, Application • Network Measurements. • Backbone • MRTG • End-To-End (Machine to Machine) • Tcpdump • Ping / Traceroute

  4. Tools • Multi Router Traffic Grapher. • Measures… • load on network links (Edge-Routers). • Network Traffic. • System Load, Login Sessions, Modem availability • Output…. • HTML, • LIVE presentation. • Graphical Images.

  5. Tools.. (MRTG) • Internal Design.. • Perl – Reads Traffic Counters of Router. • C – Logs Traffic Data and Creates Output. • SNMP – Perl Scripts reads SNMP variables. • Portability… • Unix (any) & Windows NT. • Default Sample Time : 5 mins.

  6. Techniques • Tcpdump/Windump • Packet Capture. • Supported by PCAP / JPCAP APIs. • Explained in Java Program. • Filters….. • Protocol – TCP/UDP, 802.3, ICMP etc. • Count • Boolean Expressions. – Examples. • Interface. – eth0, hme0 etc.

  7. TCPDUMP… • Examples: • tcpdumphost host1 • To print all packets arriving at or departing from host1: • tcpdumphosthost1and\(host2orhost3\) • To print traffic between host1 and either host2 or host3: • tcpdumpiphost host1andnothost2 • To print all IP packets between host1 and any host except host2: • More examples @: http://www.tcpdump.org/tcpdump_man.html

  8. Java Program - Windump by Hung • Application Architecture Hierarchies • Application • Java program which uses JPCAP methods and captures packets. • Performs Analysis on the captured packets. • Uses JDBC and stores results in mySQL database.

  9. Java program …2 • Java Package: JPCAP methods used. • Provides an Interface and system for network packet capture. • JPCAP uses windump utility. • Constructor: • Jpcap(String device, int snaplen, Boolean promisc, int to_ms); • “device” : interface for capturing data • “snaplen” : Maximum # of bytes captured per packet. • “promisc” : Allows network device to intercept and capture packet. • “to_ms” : Time out limit

  10. Java program –(Methods)…3 • getDeviceList() • Returns Name of Device (Interface). • setFilter(String condition,Boolean optimize) • Setting protocol/Expression for capturing packet. • getPacket() • Captures ONE packet at a time from Interface. • loopPacket(int count, JpcapHandler handler) • Count times capturing packet.

  11. Java program ….4 • Utility: Windump. • Tcpdump equivalent utility for Windows. • Uses a low-level library “winpcap” for packet capture. • Library: Winpcap • It is an architecture for packet capture and network analysis for Win32 platforms. • It includes Kernel-Level packet filter, a Low-level DLL and High-level and system-Independent library (wpcap.dll). • Kernel: Windows Operating system.

  12. Java program….5 Begin Connect to mysql database Select database use check data tables. 1 create packet data table if needed

  13. Java Program…6 1 Get “number” of Packets. Connect to database End Insert packet data into Database Get packet Data

  14. Java program….7 • Analysis… • TTL – Values must be equal for packets with same S/D. • Flow - # of S/D pair of packets per unit time. • Delay – Time stamps of consecutive packets.

  15. Java program….8 • Limitations… • Passive Monitoring. • Non Client-Server Architecture. • Improvements…. • User Given parameters – More Flexible. • Client-Server based – “network-as-a-whole” • TCPDUMP – platform independent. • GUI

  16. Conclusion… • Network Performance can be measured at various levels. • Net. Performance can be implemented in various ways..using various tools.