Netfilter Overview

Video Activity
Join over 3 million cybersecurity professionals advancing their career
Sign up with
Required fields are marked with an *
or

Already have an account? Sign In »

Time
21 hours 25 minutes
Difficulty
Intermediate
CEU/CPE
21
Video Transcription
00:00
>> Hey there, Cybrarians. Welcome back to
00:00
the Linux plus course here at Cybrary.
00:00
I'm your instructor Rob Goelz.
00:00
In today's lesson, we're going
00:00
to have a Netfilter overview.
00:00
Upon completion of today's lesson,
00:00
you are going to be able to understand
00:00
the purpose and importance of Netfilter.
00:00
We're also going to name
00:00
other firewall technologies that do use Netfilter.
00:00
Netfilter is used by the Linux kernel
00:00
>> as a network sniffer
00:00
>> to perform packet-filtering operations.
00:00
>> It was designed to replace ipchains and ipfwadm
00:00
around 1999/2000 and has
00:00
really been used in the Linux kernel since 2003,
00:00
which was the kernel version 2.4.x.
00:00
What we consider the work of firewalls
00:00
is actually mostly handled by Netfilter.
00:00
It can do stateless packet filtering,
00:00
it can do stateful packet filtering,
00:00
it also does network address and port translation,
00:00
>> and IP forwarding.
00:00
>> Netfilter is really just the glue that allows
00:00
other applications to implement firewall technologies.
00:00
The organization that maintains
00:00
Netfilter also created the iptables software.
00:00
We're going to talk about iptables in the next lesson.
00:00
Netfilter is also used by firewalld,
00:00
which is a dynamic firewall daemon.
00:00
It has filtered ACL rules that are updated
00:00
and can be updated without restarting the service.
00:00
That's something we're going to cover in the
00:00
next, next lesson.
00:00
Then UFW, the uncomplicated firewall.
00:00
This is mostly using Debian.
00:00
It's really just a configuration interface in
00:00
Netfilter that allows for a simple rule management.
00:00
We'll see that in the next, next, next lesson.
00:00
With that, in this lesson,
00:00
we covered the purpose and importance of Netfilter,
00:00
then we talked about other firewall technologies
00:00
that work with Netfilter.
00:00
Thanks so much for being here,
00:00
>> and I look forward to seeing you in the next lesson.
Up Next