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Network Performance Measurement

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)

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Network Performance Measurement

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  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.

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