Network Analyzer :- Introduction to Wireshark
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1 Sungkyunkwan University Network Analyzer :- Introduction to Wireshark Syed M. Raza H. Choo Copyright Networking Laboratory Networking Laboratory 1/56
2 An Overview Internet Protocol Stack Networking Laboratory 2/41
3 Internet Protocol Stack Consists of five layers 5. Application 4. Transport 3. Network 2. Link 1. Physical Derived from TCP/IP protocol stack Networking Laboratory 3/41
4 Internet Protocol Stack Explained Animation Video Explanation of operation and purpose of Internet Protocol Stack Networking Laboratory 4/41
5 Internet Protocol Stack Explained Animation Video Networking Laboratory 5/41
6 Packet Encapsulation The data is sent down the protocol stack Each layer adds to the data by prepending headers 22Bytes 20Bytes 20Bytes 64 to 1500 Bytes 4Bytes Networking Laboratory 6/41
7 W I R E S H A R K Networking Laboratory 7/41
8 Wireshark Introduction Video Brief description of what is Wireshark and why it is used Networking Laboratory 8/41
9 Wireshark Introduction Video Networking Laboratory 9/41
10 Introduction (1/3) Network Traffic Trace A recording of the network packets both received by and transmitted from a network interface What is a pcap file? pcap = Packet Capture File format originally designed for tcpdump/libpcap Most widely used packet capture format Networking Laboratory 10/41
11 Introduction (2/3) What is Wireshark? Formerly known as Ethereal Wireshark is a GUI Network Protocol Analyzer Follows the rules of the pcap library Found at The complete manual is located here Networking Laboratory 11/41
12 Introduction (3/3) Some of its functions Capturing network traffic from the interface Decodes packets of common protocols Displays the network traffic in human-readable format Some of its uses Troubleshoot network problems. Learn network protocol internals. Debug protocol/program implementation. Examine network-related security issues Networking Laboratory 12/41
13 Wireshark GUI Networking Laboratory 13/41
14 Wireshark GUI and Layout Video Brief introduction of Wireshark GUI, its different options and layout Networking Laboratory 14/41
15 Wireshark GUI and Layout Video Networking Laboratory 15/41
16 Wireshark Startup Main Screen Previously saved files List of interfaces Select one of the listed interfaces to start the capture on that interface Networking Laboratory 16/41
17 Screen Layout of Wireshark Menu Packet List The summary line, briefly describing what the packet is. Packet Details A protocol tree is shown in detail, allowing you to drill down deep your interest Packet Bytes shows what the packet looks like when it goes over the wire. Networking Laboratory 17/41
18 Basic UI Options (1/2) Change columns in the packet list to see the information relevant to you Edit -> Preferences ->Columns Different interface related options Columns is one of the options Column title and information shown in that column can be changed Select the type of information shown in a column New column can be added or removed Networking Laboratory 18/41
19 Basic UI Options (2/2) File -> Open Opens a packet capture file View -> Time Display Format Change the format of the packet timestamps in the packet list pane Switch between absolute and relative timestamps Change level of precision View -> Name Resolution Allow wireshark to resolve names from addresses at different protocol layers Networking Laboratory 19/41
20 Enable Protocols Enabled protocol list shows which protocols Wireshark can understand and can dissect (parse) It s a huge list which covers almost all protocols, and gets updated with every new version release Networking Laboratory 20/41
21 Wireshark Packet Capture and Options Video Brief introduction about different options of packet capture options Networking Laboratory 21/41
22 Wireshark Packet Capture and Options Video Networking Laboratory 22/41
23 Packet Capture Capture -> Interfaces Available network interfaces for capture Interfaces status All interfaces in the system To record all traffic (even traffic not meant for you) Only Capture certain packet Networking Laboratory 23/41
24 Capture Options Packet capture options How the list of packets is shown during he live capture Automatic stop conditions Networking Laboratory 24/41
25 Capture Output Packet capture output Specify location and name of file where to store the live capture Specify file format Option for automatically creating new file Networking Laboratory 25/41
26 Start Capturing Networking Laboratory 26/41
27 Stop Capturing Networking Laboratory 27/41
28 Packet List(1/2) Displays all of the packets in the trace in the order they were recorded Columns Time the timestamp at which the packet crossed the interface Source the originating host of the packet Destination the host to which the packet was sent Protocol the highest level protocol that Wireshark can detect Length the length in bytes of the packet on the wire Info an informational message pertaining to the protocol in the protocol column Networking Laboratory 28/41
29 Packet List (2/2) Coloring Default Coloring Gray TCP packets Black with red letters TCP Packets with errors Green HTTP Packets Light Blue UDP Packets Pale Blue ARP Packets Lavender ICMP Packets Black with green letters ICMP Packets with errors Colorings can be changed under View -> Coloring Rules Networking Laboratory 29/41
30 Column Sorting Output is Sorted By Frame No By Default Output is Sorted By Source Address Networking Laboratory 30/41
31 Display Packet Captured Frame # Ethernet Header Destination Mac Address Field in Ethernet Header Networking Laboratory 31/41
32 Wireshark Filters Video Explanation about Capture and Display filters Networking Laboratory 32/41
33 Wireshark Filters Video Networking Laboratory 33/41
34 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 34/41
35 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 35/41
36 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 36/41
37 Display Filters GUI Display filter In the packet list only show packets which are allowed by the filter Quick Way to Learn Display Filter Commands Networking Laboratory 37/41
38 Display Filters GUI 3 1 Filter expression From the list of protocols and their fields, an expression can be created for the display filter 2 Networking Laboratory 38/41
39 Display Filters GUI Total packets captured Because of filter packets displayed are less than captured Networking Laboratory 39/41
40 Display Filter Examples Filter examples http.request Display all HTTP requests http.request http.response Display all HTTP request and responses ip.addr == Display all IP packets whose source or destination is localhost tcp.len < 100 Display all TCP packets whose data length is less than 100 bytes http.request.uri matches (gif)$ - Display all HTTP requests in which the uri ends with gif dns.query.name == - Display all DNS queries for Networking Laboratory 40/41
41 Thank you Networking Laboratory 41/41
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