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- [Instructor] If you ask

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any computer networking professional

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if they use open-source software,

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they will look at you as if you were an alien.

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There are so many they're using daily.

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To name a few, these range from operating systems,

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or OSs like Linux, to popular stand-alone applications

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such as packets sniffers.

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I'm sure that many of you are already familiar

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with Wireshark, a popular packet sniffing program.

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Most of the networking software

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comes pre-packaged together with an OS.

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On Microsoft Windows, ipconfig is such a program.

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We'll be using it often to check the properties

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of a network interface card, you see here.

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The most basic information ipconfig provides

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is the internet protocol, or IP address,

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that uniquely identifies a network device.

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The equivalent open-source utility

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to ipconfig on Linux is ifconfig.

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Now, you may ask why they use two different names

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for an almost identical functionality?

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My answer to that is that nobody knows,

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but these subtle differences are what makes each OS unique

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and special with their individual flavors.

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These also mean job security for many of us

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We'll be using Ubuntu in this course, which is popular

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but doesn't include the software like Wireshark by default.

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Several Linux distributions, like Kali

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and Sans Investigative Forensics Toolkit, or SIFT,

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specialize in network security and network forensics

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with Wireshark pre-installed.

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Installing well-known open-source software

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like Wireshark on Linux is straightforward.

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Let's give it a try on Ubuntu.

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Type sudo apt-get update to get

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the latest software package information, press Enter.

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Next, type sudo apt-get install wireshark, press Enter

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and type Y, press Enter.

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Choose OK here, and choose no here.

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That's it, there's no need to make a purchase or anything.

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You can also install other open-source networking tools

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like MMAP, and Netcat free of charge.

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There are too many open-source tools to mention here

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but ifconfig, Wireshark, MMAP

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and Netcat already cover many grounds.