- [Instructor] If you ask
any computer networking professional
if they use open-source software,
they will look at you as if you were an alien.
There are so many they're using daily.
To name a few, these range from operating systems,
or OSs like Linux, to popular stand-alone applications
such as packets sniffers.
I'm sure that many of you are already familiar
with Wireshark, a popular packet sniffing program.
Most of the networking software
comes pre-packaged together with an OS.
On Microsoft Windows, ipconfig is such a program.
We'll be using it often to check the properties
of a network interface card, you see here.
The most basic information ipconfig provides
is the internet protocol, or IP address,
that uniquely identifies a network device.
The equivalent open-source utility
to ipconfig on Linux is ifconfig.
Now, you may ask why they use two different names
for an almost identical functionality?
My answer to that is that nobody knows,
but these subtle differences are what makes each OS unique
and special with their individual flavors.
These also mean job security for many of us
We'll be using Ubuntu in this course, which is popular
but doesn't include the software like Wireshark by default.
Several Linux distributions, like Kali
and Sans Investigative Forensics Toolkit, or SIFT,
specialize in network security and network forensics
with Wireshark pre-installed.
Installing well-known open-source software
like Wireshark on Linux is straightforward.
Let's give it a try on Ubuntu.
Type sudo apt-get update to get
the latest software package information, press Enter.
Next, type sudo apt-get install wireshark, press Enter
and type Y, press Enter.
Choose OK here, and choose no here.
That's it, there's no need to make a purchase or anything.
You can also install other open-source networking tools
like MMAP, and Netcat free of charge.
There are too many open-source tools to mention here
but ifconfig, Wireshark, MMAP
and Netcat already cover many grounds.