Do I Need A Firewall in Linux

Discussing when a firewall is needed in Linux and I show how to check what services you have open on your system. I also give a quick explanation about computer networking protocols ICMP, TCP, and UDP.

Checking services:
$ ss -nltup

Scanning System:
$ sudo nmap -sS ip
$ sudo nmap -sU -p “udp ports” ip

Tutorial Videos:

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#Firewall #Linux #Cybersecurity

[casperes]

Did you say “the Linux”? My professor always said The Linux... Memories.

[badgerboy]

A security pro and nmap, that makes for some great viewing :-) Very well explained, much appreciated!

[volkadee]

I'm not running a server but I just have ufw because I'm paranoid

[btno]

Hi, what are the most important iptables port block. I've known the malware BLUEKEEP and or nsa SAMBA or SMB vulnerability so therefore I don't use it therefore I block ports 445 136 137 138 139 140 and ssh i have no need nor do i need telnet and ftp 21 22 23, and then also no use for printer share therefore also block 631. now is port 1900 used by routers for broadcast discovery???

[ygjtv-----]

Yes for server, no for home workstation

[professormoriarty]

The Linux kernel performs a basic function for a Web server. A Linux desktop performs multiple functions and is a totally insecure desktop system. The majority of Linux desktop users do not know what is running on the system do not know what data is leaving the system. A typical secure Windows system will have a two-way firewall, and these people will understand more about what is taking their information than a Linux desktop user would have.. When is the average user not an average user? when does the average user become nonvulnerable.

[btno]

iptables -I INPUT -p tcp --destination-port 445 -s 0/0 -j DROP

[ALPHONSO_NANOOK]

what about VPN for Linux is it recommendable to use it and if it is which free one do you recommend? Thanks

[btno]

is this an NSA ip address??? 216.239.32.10

[siwiecministro]

Unfortunately nowadays some kind of firewalling is necessary in every system. Because we cannot really trust applications we install. Even "unhardened" firefox is constantly trying to connect somewhere without authorisation.
But in Linux there is no per-application firewall (that works). In Windows there are plenty, but none which allows total control. The only solution I can see is to set up password protected proxy between one's computer and the net and use proxifier of some kind to run only apps selected by oneself in this "tunnel".

[sneekylinux]

Bare peng mate....nice..P.S. Wife has a hat issue....(you know what I mean..)

[springbok]

Windows defender firewall is perfectly fine for most and is on by default. I’m quite impressed by Windows Security. Better than something like Mac provides.

[PlsucksBlogspot]

Will you be reviewing Linux Lite 5.0 soon? It would be a big letdown to your biggest Patreon supporter if you didn’t.