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Network Analyzer CS4500 Spring 2004 By Palantir: Hong Jiang Ryan Pratt Raul Chiari Overview: A Network Sniffer Basically, Our Network Analyzer is a Network Sniffer. So What is a Network Sniffer? DEFINITION: Network sniffers are diagnostic software applications, often bundled with hardware devices, that provide protocol-level analysis of data flowing through a network, packet by packet. This information can help administrators monitor and identify performance problems. By Alan Joch at http://www.computerworld.com/networki ngtopics/networking/story/0,10801,6239 0,00.html A picture of a Network Sniffer: Overview: Our Network Analyzer A screenshot of our Network Analyzer Standard features: • Our Network Analyzer can capture data "off the wire" from a live network connection, or read from a capture file. • Our Network Analyzer can filter the capture request before it capture any data. • Our Network Analyzer can show both a line chart and a bar chart for protocol loading in different time. • Our Network Analyzer can save the analyzed data to a file as a snapshot of the network. Features: Start capturing data After you click Start, you will see a window that filters your capture requests. You can choose to load your saved data from a file or you can enter how many packets you want to capture, start to capture live data, and then save the result to a file. You can either load your filter request or create one. After you press “Start”, the program will start to capture live data. Features: Showing data Our Network Analyzer has the ability to capture seven protocols. They are Ethernet, IP, ARP, TCP, UDP, ICMP, and HTTP. You are able to mark packets and set time reference to packets. The marked packet will has “MARK” in its time column. If you click on the title of each columns, that column will be sorted. Right now, the packets are sorted by the packets number. After you click on one of the packets. You will be able to see a tree structure that shows detail data for that packet on the left bottom of the GUI. On the right side of the GUI, you can see the data in both Hex and ASCII format. Features: Statistics Our Network Analyzer has the ability to show a line chart and a bar chart. The Line chart shows how many protocols are captured in certain time intervals. Bar chart shows how many protocols are captured overall.