Introduction to OSI model and Network Analyzer :- Introduction to Wireshark

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1 Sungkyunkwan University Introduction to OSI model and Network Analyzer :- Introduction to Wireshark Syed Muhammad Raza Copyright Networking Laboratory 1/56

2 An Overview of ISO and its 7-Layer OSI Model Networking Laboratory 2/56

3 OSI Model (1/2) ISO International Standards Organization OSI Open Systems Interconnect Networking Laboratory 3/56

4 OSI Model (2/2) Introduced in 1978 and revised in 1984 Formulates the communication process into structured layers There are seven layers in the model, hence the name the 7- Layer model The model acts as a frame of reference in the design of communications and networking products Networking Laboratory 4/56

5 Layers of OSI Model 7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical Networking Laboratory 5/56

6 Division of Layers in OSI Model 7. Application 6. Presentation 5. Session 4. Transport Upper Layers Middle Layer 3. Network 2. Data Link Lower Layers 1. Physical Networking Laboratory 6/56

7 Function of Layers in OSI Model Each layer deals with one aspect of networking Layer 1 deals with the communication media Each layer communicates with the adjacent layers In both directions Ex: Network layer communicates with: Transport layer Data Link layer Each layer formats the data packet Ex: Adds or deletes addresses Networking Laboratory 7/56

8 Role of Layers in OSI Model 7. Application Node A 6. Presentation Data In 1. Physical To/from Node B Data Out Networking Laboratory 8/56

9 Communication Between Layers (1/2) Data Encapsulation 7. Application 6. Presentation 5. Session Data Stripping Networking Laboratory 9/56

10 Communication Between Layers (2/2) Node a Node b 7. Application 7. Application 1. Physical 1.Physical Networking Laboratory 10/56

11 Layer Operations in OSI Model At each layer, additional information is added to the data packet An example would be information related to the IP protocol that is added at Layer 3 Networking Laboratory 11/56

12 Formatting of Data Through the Layers Application Header Presentation Header Session Header Network Header Transport Header Data Link Header and Trailer Physical Frame Preamble Networking Laboratory 12/56

13 Standardizing Packet Formatting Packets must conform to a standard in order for the nodes in a network to be able to communicate with one another The International Standards Organization (ISO) has provided a reference model Standards are established for operations at each layer of the ISO/OSI model in the form of protocols Networking Laboratory 13/56

14 OSI Model Explained Animation Video Explanation of operation and purpose of OSI Layer Model Networking Laboratory 14/56

15 OSI Model Explained Animation Video Networking Laboratory 15/56

16 W I R E S H A R K Networking Laboratory 16/56

17 What is Wireshark? Formerly known as Ethereal Wireshark is a GUI Network Protocol Analyzer Display filters in Wireshark are very powerful Follows the rules of the pcap library Networking Laboratory 17/56

18 Functions Capturing network traffic from the interface Decodes packets of common protocols Displays the network traffic in human-readable format Networking Laboratory 18/56

19 Wireshark Startup Networking Laboratory 19/56

20 Screen Layout of Wireshark The summary line, briefly describing what the packet is. A protocol tree is shown, allowing you to drill down to exact protocol or field that you interested in. a hex dump shows you exactly what the packet looks like when it goes over the wire. Filename Of Current File Networking Laboratory 20/56

21 Edit -> Preferences ->Columns Networking Laboratory 21/56

22 Enable Protocols Networking Laboratory 22/56

23 Capture Options Networking Laboratory 23/56

24 Capture Options To Specify the interface to be monitored To Record all traffic even not for you Only Capture part of the packet Only Capture certain packet To Store the result in file Automatic Stop Condition Networking Laboratory 24/56

25 Start Capturing Networking Laboratory 25/56

26 Stop Capturing Networking Laboratory 26/56

27 Display Packet Captured Frame # Ethernet Header Destination Mac Address Field in Ethernet Header Networking Laboratory 27/56

28 Column Sorting Output is Sorted By Frame No By Default Output is Sorted By Source Address Networking Laboratory 28/56

29 Conversation List Networking Laboratory 29/56

30 Saving Packets Captured Networking Laboratory 30/56

31 Capture Filters The capture filter syntax follows the rules of the pcap library This syntax is different from the display filter syntax Referring manual page of tcpdump ( ) Sample filters: src ip ether src 00:50:BA:48:B5:EF Networking Laboratory 31/56

32 Capture Filters A capture filter for HTTP than captures traffic to and from a particular host tcp port 80 and host A capture filter for HTTP than captures traffic not from a particular host tcp port 80 and not host A capture filter to and from an Ethernet address ether 00:00:01:01:02:22 Networking Laboratory 32/56

33 Display Filters C-like symbols, or through English-like abbreviations: eq, == Equal ne,!= Not equal gt, > Greater than lt, < Less Than ge, >= Greater than or Equal to le, <= Less than or Equal to Networking Laboratory 33/56

34 Display Filters GUI Quick Way to Learn Display Filter Commands Networking Laboratory 34/56

35 Display Filters GUI Networking Laboratory 35/56

36 Display Filters GUI Networking Laboratory 36/56

37 Follow TCP Stream Networking Laboratory 37/56

38 Follow TCP Stream red - stuff you sent blue - stuff you get Networking Laboratory 38/56

39 Expert Info Networking Laboratory 39/56

40 Conversations Networking Laboratory 40/56

41 Conversations Networking Laboratory 41/56

42 IOGraphs Networking Laboratory 42/56

43 IOGraphs Networking Laboratory 43/56

44 IOGraphs Networking Laboratory 44/56

45 IOGraphs Networking Laboratory 45/56

46 IOGraphs Networking Laboratory 46/56

47 Flow Graphs Networking Laboratory 47/56

48 Flow Graphs Networking Laboratory 48/56

49 HTTP Analysis Networking Laboratory 49/56

50 HTTP Analysis Load Distribution Networking Laboratory 50/56

51 HTTP Analysis Packet Counter Networking Laboratory 51/56

52 HTTP Analysis Requests Networking Laboratory 52/56

53 And there is much much more which you should explore on your own Happy Exploring Networking Laboratory 53/56

54 Improving WireShark Performance Don t use capture filters Increase your read buffer size Don t update the screen dynamically Get a faster computer Use a TAP Don t resolve names Networking Laboratory 54/56

55 Some Useful Information Wireshark TCPDUMP MAN Page IP Protocol Networking Laboratory 55/56

56 Thank you Networking Laboratory 56/56

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