This lecture sets up the nuances of installing Wireshark on multiple platforms.  We will dive in to installing on Windows 7 and also the need for WinPCAP.

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This video goes over installing the X11 client XQuartz and installing Wireshark so that it works properly with XQuartz.

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Instructions on how to install and run wireshark on Ubuntu 12.04

Commands Used:

01:25 - sudo apt-get install wireshark

02:22 - wireshark

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This lecture will discuss the theroy behind placing wireshark in the proper location on a network for maximum packet capture.

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Here we will set up your first network capture.  We will discuss many of the options related to packet captures.

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Capture filters are great for capturing a small subset of traffic on a very congested network.  This lecture will explain how to build capture filters and how to apply them in wireshark.  See some of the supplemental resources for more detialed information on all the filters available.

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Once you have captured traffic from the network, wireshark has a whole host of tools that allow you to manipulate the data.  This lecture will show you some of the common tools such as time shifting, changing column preferences and merging PCAP files.

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Display filters allow you to display only the packets you want to see or to filter out packets that you don't want to see.  In this lecture we will discuss several ways to build display filters and how to save them for future use.

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In your captured data there may be several computers all talking at once.  Wireshark has the ability to rebuild these "conversations" and show you the plain text data.  This lecture will show you how to rebuild the conversations and see what conversations happened on the network.

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One of the main functions of networks is to transfer files between two end points.  While the wireshark interface shows you the individual packets it may be difficult to see what was actually transmitted.  Wireshark has several tools that will rebuild files that were transmitted over HTTP and SMB.  This lecture will show you two ways of rebuilding files from a PCAP.

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Tshark is a command line version of wireshark that comes bundled with the application. It is very handy for scripting and carving smaller pcap files out of larger pcap files. This lecture will demonstrate the power of this program.

Commands Used:

01:13 - tshark --help

02:30 - ls -lah

03:11 - tshark -r large.cap -R http -w small.pcap

03:32 - ls -lah

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In this lecture we will go over some advanced tshark uses. Discussing field extraction using tshark and organizing the output.

Commands Used:

02:53 - “tshark -r http.pcap -T fields -e http.request.method”

03:56 -“tshark -r http.pcap -T fields -e http.request.method | sort | uniq -c”

05:30 - “tshark -r http.pcap -T fields -e http.request.uri”

07:21 - “tshark -r http.pcap -R “http.request.method == “GET”” -T fields -e ip.dst”

07:44 - “tshark -r http.pcap -R “http.request.method == “GET”” -T fields -e ip.dst | sort | uniq-c”

In this lecture I discuss using wireshark and Virus Total to discover if any computers on your network are communicating with known bad IP addresses.

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An introduction to TCPDUMP and how it is different from wireshark.

Start your first capture using TCPDUMP and learn the common command line switches.

Commands Run:

 00:30 - man tcpdump 

 03:48 - tcpdump -D 

 04:26 - tcpdump -i en0 

 05:05 - tcpdump -i en0 -n 

 05:37 - tcpdump -i en0 -n -vvv 

 06:16 - tcpdump -i en0 -n -vvv -w test.pcap 

 07:16 - tcpdump -i en0 -n -vvv -s 96 -w test.pcap 

Create filters for TCPDUMP using the Berkley Packet Filter (BPF) syntax.

Commands Run:

 02:50 - tcpdump -i en0 -n -vvv host 10.0.1.21 

 03:14 - tcpdump -i en0 -n -vvv host 10.0.1.21 and port 80 

 04:17 - tcpdump -i en0 -n -vvv net 10.0.1.0/24 and port 80 

Use TCPDUMP to carve smaller pcap files out of much larger datasets.

Commands Run:

 00:28 - ls -lah 

 01:13 - tcpdump -r sansholidayhack2013.pcap tcp and port 80 

 01:37 - tcpdump -r sansholidayhack2013.pcap -w http.pcap tcp and port 80 

 01:41 - ls -lah 

 02:23 - tcpdump -r sansholidayhack2013.pcap -w badip.pcap host 208.80.154.225 

 02:26 - ls -lah 

Cheat sheet for TCPDUMP commonly used commands and filters.